CN113816390A - Preparation system and preparation method of high-activity metakaolin with controllable finished product color - Google Patents
Preparation system and preparation method of high-activity metakaolin with controllable finished product color Download PDFInfo
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- CN113816390A CN113816390A CN202111202560.1A CN202111202560A CN113816390A CN 113816390 A CN113816390 A CN 113816390A CN 202111202560 A CN202111202560 A CN 202111202560A CN 113816390 A CN113816390 A CN 113816390A
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- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 230000000694 effects Effects 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 142
- 230000003647 oxidation Effects 0.000 claims abstract description 68
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 68
- 239000000725 suspension Substances 0.000 claims abstract description 66
- 239000000463 material Substances 0.000 claims abstract description 61
- 238000001354 calcination Methods 0.000 claims abstract description 44
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 26
- 239000001301 oxygen Substances 0.000 claims abstract description 26
- 230000004048 modification Effects 0.000 claims abstract description 24
- 238000012986 modification Methods 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 22
- 239000002826 coolant Substances 0.000 claims abstract description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 16
- 230000009467 reduction Effects 0.000 claims abstract description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 50
- 239000003546 flue gas Substances 0.000 claims description 50
- 239000002994 raw material Substances 0.000 claims description 44
- 239000000446 fuel Substances 0.000 claims description 39
- 238000001035 drying Methods 0.000 claims description 27
- 230000001590 oxidative effect Effects 0.000 claims description 19
- 239000005995 Aluminium silicate Substances 0.000 claims description 16
- 235000012211 aluminium silicate Nutrition 0.000 claims description 16
- 238000002485 combustion reaction Methods 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 10
- 238000000354 decomposition reaction Methods 0.000 claims description 7
- 239000011261 inert gas Substances 0.000 claims description 6
- 230000014759 maintenance of location Effects 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 31
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 28
- 239000004927 clay Substances 0.000 description 19
- 239000004568 cement Substances 0.000 description 17
- 239000007787 solid Substances 0.000 description 13
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 12
- 238000000926 separation method Methods 0.000 description 9
- 239000004567 concrete Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910052595 hematite Inorganic materials 0.000 description 5
- 239000011019 hematite Substances 0.000 description 5
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 235000012054 meals Nutrition 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical group [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 229910052598 goethite Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- AEIXRCIKZIZYPM-UHFFFAOYSA-M hydroxy(oxo)iron Chemical compound [O][Fe]O AEIXRCIKZIZYPM-UHFFFAOYSA-M 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000010220 ion permeability Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229910052622 kaolinite Inorganic materials 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 229910021646 siderite Inorganic materials 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/36—Silicates having base-exchange properties but not having molecular sieve properties
- C01B33/38—Layered base-exchange silicates, e.g. clays, micas or alkali metal silicates of kenyaite or magadiite type
- C01B33/40—Clays
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/10—Clay
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/04—Heat treatment
- C04B20/06—Expanding clay, perlite, vermiculite or like granular materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
- F27D13/005—Drying of green clay prior to baking
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Dispersion Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Inorganic Chemistry (AREA)
- Furnace Details (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a system and a method for preparing high-activity metakaolin with controllable finished product color, which comprises a suspension preheating system, a calcining furnace system, a first cooling system and a second cooling system, wherein the calcining furnace system comprises a preheating furnace and a modification furnace, an outlet at the top of the preheating furnace is connected with an inlet at the bottom of the modification furnace, and the interior of the modification furnace is a reduction zone; an oxidation furnace system is arranged between the air outlet of the lowest stage cyclone preheater and the inlet of the penultimate cyclone preheater of the suspension preheating system, and an oxidation zone is arranged in the oxidation furnace; the discharge hole of the lowest stage of the cyclone preheater is connected with the material inlet of the first cooling system, the oxygen concentration of the cooling medium of the first cooling system is below 4 percent, the first cooling system is used for cooling the material to 200-350 ℃, and the material outlet of the first cooling system is connected with the material inlet of the second cooling system. The invention can produce metakaolin meeting the color control requirement, and solves the problems of high energy consumption of a preparation system, small processing capacity, difficult control of product quality and the like.
Description
Technical Field
The invention relates to the technical field of metakaolin, in particular to a system and a method for preparing high-activity metakaolin with controllable finished product color.
Background
The mixed material is a common raw material of cement and concrete, mainly takes traditional industrial solid wastes such as ground slag, fly ash and the like as main materials, and is limited by the quality and short-distance unavailability of the industrial wastes, or the quantity of the substituted clinker is not high, or the cement strength is obviously reduced after large mixing quantity.
Kaolin (Al)2O3·2SiO2·2H2O，AS2H2) The metakaolin is common mineral in natural clay or clayey tailings, and metakaolin (MK for short) can be generated through dehydration at a proper temperature (600-900 ℃). Kaolin belongs to a layered silicate structure, and layers are bonded by van der waals bonds, in which OH-hydroxyl groups are bonded more strongly. When the kaolin is heated in the air, a plurality of structural changes occur, and when the kaolin is heated to about 600 ℃, the layered structure of the kaolin is destroyed because of the removal of hydroxyl groups, and amorphous transition phase metakaolin is formed. The metakaolin has irregular molecular arrangement, is in a thermodynamic metastable state and has gelation property under alkali excitation. Metakaolin is a highly active artificial pozzolanic material, which can be blended with calcium hydroxide (Ca (OH)2CH) and water to generate a volcanic ash reaction to generate a hydration product similar to cement.
By utilizing the characteristic, the clay containing kaolinite and aluminum-silicon minerals with similar structures is calcined to prepare a mixed material, and then the mixed material is compounded with gypsum, portland cement clinker or limestone to prepare calcined clay-based composite cement, so that the method becomes a research hotspot of the international cement and concrete industries in recent years. The clinker is replaced by the calcined clay with higher activity, so that the clinker dosage of the cement can be reduced from 75% to 45% -50%, the compressive strength is not reduced after 28 days, the flexural strength can be improved by more than 20%, and the technical goals of low clinker coefficient, low carbon emission and high strength are realized. Meanwhile, research shows that based on the difference of hydration reaction products, compared with Portland cement and common Portland cement doped with fly ash or ground mineral powder, the hardened cement stone has lower porosity and high compactness, so that the cement stone has excellent sulfate corrosion resistance and chloride ion permeability, and is particularly suitable for being used in severe environments such as maritime work, saline alkali and the like.
Since the cost of calcined clay preparation is lower than that of clinker preparation, CO in the calcined clay preparation process2The discharge amount is lower than that of CO in the clinker preparation process2The emission, coupled with the extensive sources of clay raw materials, is particularly attractive to replace clinker with a large amount of calcined clay in the concrete and cement industries, against the background that the concrete and cement industries actively promote carbon emission reduction.
Currently, the existing calcined clay preparation methods mainly include a fixed bed type, a semi-fixed bed type, a fluidized bed type, and the like. The method for preparing calcined clay by adopting rotary kiln calcination is a commonly adopted method, but the problems of high system heat consumption, easy overburning and inactivation of products, difficult quality control and the like exist when the rotary kiln calcination is adopted. On the other hand, clay raw materials usually contain a certain amount of iron, mainly in the form of goethite, hematite, siderite, and the like. The iron phase undergoes decomposition during clay calcination and eventually exists as red hematite, so that the calcined clay exhibits a distinct red color. The direct use of red calcined clay for cement production affects the color of the finished cement product, and is easily mistaken by the market as poor cement and affects the sale. Analyzed in principle, hematite (Fe)2O3) Reddish brown, magnetite (Fe)3O4) And wustite (FeO) in the form ofThe color of the finished product of the metakaolin containing iron is mainly determined by the existence form of the iron phase in the finished product, and the color of the metakaolin finished product can be effectively changed by reducing the content of hematite in the metakaolin finished product. Based on the above analysis, a reducing atmosphere was created during metakaolin preparation to introduce Fe3+Reduction to Fe2+Is an effective means for reducing the content of hematite in the metakaolin finished product so as to prepare the metakaolin meeting the requirements of the concrete and cement industries. The method adopts reasonable process technology to produce the calcined clay with high activity and color consistent with that of the cement clinker with lower energy consumption and higher efficiency, and becomes the key for large-scale production and wide application of the calcined clay and calcined clay-limestone composite cement.
In conclusion, based on market needs and key technical problems, the color-controllable high-activity calcined clay preparation system and the preparation method thereof, which can fully consider the color requirement and the activity index requirement of the cement concrete industry on calcined clay and can solve the problems of high energy consumption, small processing capacity, difficult control of product quality and the like of the calcined clay preparation system, have important practical significance.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a system and a method for preparing high-activity metakaolin with controllable finished product color.
The invention is realized in this way, a finished product color controllable high activity metakaolin preparation system, including suspension preheating system, calcining furnace system, the first cooling system and the second cooling system, the calcining furnace system includes preheating furnace and modifying furnace, the bottom of the preheating furnace is a combustion-supporting air inlet, the top outlet of the preheating furnace is connected with the bottom inlet of the modifying furnace, the top outlet of the modifying furnace is connected with the inlet of the lowest stage cyclone preheater of the suspension preheating system, the discharge port of the last but one second stage cyclone preheater of the suspension preheating system is connected with the raw material feed port of the preheating furnace and the raw material feed port of the modifying furnace respectively, the preheating furnace and the modifying furnace are provided with fuel feed port and raw material feed port respectively, the modifying furnace is a reduction zone;
an oxidation furnace system is arranged between the air outlet of the lowest stage cyclone preheater of the suspension preheating system and the inlet of the penultimate cyclone preheater, the oxidation furnace system comprises an oxidation furnace, the bottom inlet of the oxidation furnace is connected with the air outlet of the lowest stage cyclone preheater of the suspension preheating system, the top outlet of the oxidation furnace is connected with the inlet of the penultimate cyclone preheater of the suspension preheating system, a fuel feeding port and a combustion-supporting air inlet are arranged on the oxidation furnace, and an oxidation area is arranged in the oxidation furnace;
the discharge port of the lowest stage cyclone preheater of the suspension preheating system is connected with a material inlet of a first cooling system, the first cooling system comprises at least one stage of cyclone cooler, the oxygen concentration of a cooling medium of the first cooling system is below 4%, the first cooling system is used for cooling the material to 200-350 ℃, a material outlet of the first cooling system is connected with a material inlet of a second cooling system, the second cooling system comprises at least one stage of cyclone cooler, the cooling medium of the second cooling system is conventional air, and an air outlet of the second cooling system is respectively connected with a combustion-supporting air inlet of the preheating furnace and a combustion-supporting air inlet of the oxidizing furnace.
Preferably, the top air outlet of the suspension preheating system is connected with the air inlet of the first cooling system,
preferably, the preheating furnace consists of a preheating furnace cone, a preheating furnace cylinder and a preheating furnace throat from bottom to top in sequence, wherein a fuel feeding port of the preheating furnace is positioned on the preheating furnace cone, and a raw material feeding port of the preheating furnace is positioned on the preheating furnace cylinder;
the modifying furnace sequentially comprises a modifying furnace cone and a modifying furnace cylinder from bottom to top, wherein a fuel feeding port of the modifying furnace is positioned on the middle parts of the modifying furnace cone and the modifying furnace cylinder, and a raw material feeding port of the modifying furnace is respectively positioned at the bottom and the middle part of the modifying furnace cylinder;
the oxidation furnace is sequentially composed of an oxidation furnace cone and an oxidation furnace cylinder from bottom to top, a fuel feeding port of the oxidation furnace is positioned on the middle parts of the oxidation furnace cone and the oxidation furnace cylinder, and a combustion-supporting air inlet of the oxidation furnace is positioned on the oxidation furnace cylinder.
Preferably, the device also comprises a drying and crushing system for drying and crushing the raw materials, wherein a material outlet of the drying and crushing system is connected with the suspension preheating system through a cyclone separator; and a heat source inlet of the drying and crushing system is connected with an air outlet of the first cooling system, and/or is connected with an air outlet of the second cooling system, and/or is connected with a hot blast stove system.
The method for preparing the high-activity metakaolin with controllable finished product color by adopting the system comprises the steps that raw materials enter a calcining furnace system after being preheated by a suspension preheating system, a combustion environment of reducing atmosphere with an excess air coefficient less than 1.0 is formed in the calcining furnace system, and a combustion environment of oxidizing atmosphere with an excess air coefficient more than 1.0 is formed in an oxidizing furnace; the calcining temperature in the calcining furnace system is 650-1000 ℃, the flue gas formed by incomplete combustion of fuel and decomposition of kaolin in the calcining furnace system enters the lowest stage cyclone preheater of the suspension preheating system along with decomposed materials, the flue gas then enters the oxidizing furnace system, unburned fuel in the flue gas in the oxidizing furnace system is fully burned out, and simultaneously, CO and combustion-supporting air entering the oxidizing furnace are fully reacted; the material separated by the lowest stage cyclone preheater of the suspension preheating system enters a first cooling system, the oxygen concentration of a cooling medium of the first cooling system is below 4%, the material is cooled to 350 ℃ by the first cooling system, and then the material enters a second cooling system, and is cooled to 60-150 ℃ by the second cooling system, so that the finished product of the metakaolin with controllable color is obtained.
Preferably, the excess air coefficient in the calcining furnace system is 0.5-1.0; the excess air coefficient in the oxidation furnace is 1.0-1.2.
Preferably, the cooling medium of the first cooling system is inert gas or low-oxygen flue gas, the oxygen concentration in the low-oxygen flue gas is controlled to be below 4%, and the cooling medium of the second cooling system is conventional air.
Further preferably, the low-oxygen flue gas is flue gas from the top air outlet of the suspension preheating system.
Preferably, the flue gas at the outlet of the first cooling system enters a drying and crushing system, and the flue gas at the outlet of the second cooling system enters a preheating furnace, an oxidation furnace and a drying and crushing system.
Preferably, the retention time of the gas in the calciner system is 2-10 s.
The specific principle of the invention is as follows:
the key to controlling the color of the metakaolin finished product is the control of reduction calcination and cooling. Firstly, in the preferred calcining temperature of the calcining furnace system, the kaolin can be fully decomposed to form metakaolin, and the metakaolin can be prevented from crystallization and precipitation and losing activity. In order to control the color of a metakaolin finished product, in the process of decomposing the metakaolin to form the metakaolin, the invention reasonably designs the combustion-supporting air quantity and the fuel consumption entering a calcining furnace system, so that the fuel in the calcining furnace system is incompletely combusted to form a reducing atmosphere (the excess air coefficient is less than 1.0), and further the Fe in the raw materials is reduced3+Reduction to Fe2+Fe in metakaolin2+And finally exists in the form of magnetite, so that the metakaolin finished product presents a gray black color. The flue gas formed by incomplete combustion of the fuel and decomposition of the kaolin in the calciner system leaves the calciner system, enters the suspension preheating system, then enters the oxidation furnace, and part of air subjected to heat exchange by the second cooling system enters the oxidation furnace and fully reacts with unburnt fuel and CO in the flue gas, so that full combustion of the fuel and full release of heat energy are ensured. Secondly, in the cooling process of the high-temperature metakaolin, the cooling atmosphere and the cooling temperature control need to be comprehensively considered. Through experimental research, if the cooling medium of the metakaolin is inert gas (such as N)2Etc.) or low-oxygen flue gas (the oxygen concentration in the flue gas is preferably controlled within 3-4%), and Fe is added into the metakaolin prepared by reduction calcination2+The magnetite in the form can not be oxidized into Fe again in the cooling link3+(ii) a Experimental research proves that Fe is contained in metakaolin prepared by reduction calcination2+The magnetite in the form of magnetite is at 300-350 deg.C and belowThe zone is in a stable state and will not be oxidized again into Fe even if contacting with the normal air3+. Based on the theoretical research work, considering that the concentration of oxygen in the flue gas at the outlet of the suspension preheating system can be controlled to be 2-3%, the suspension preheating system is an ideal cooling medium and can be used for realizing the first-stage quenching of hot materials, so that the flue gas at the outlet of the suspension preheating system is used for cooling the hot materials entering the first cooling system, the materials are cooled in the cyclone cooler of the first cooling system, and the color controllability is ensured. Through detailed theoretical calculation, the thermal material can be quenched to the temperature range of 300-350 ℃ and below. The material quenched by the first cooling system enters a second cooling system and is cooled to 60-150 ℃ by conventional air.
In the process, raw material powder meeting the production requirement is obtained after the kaolin raw material is subjected to a raw material pretreatment procedure. Raw meal powder is fed into a suspension preheating system after gas-solid separation by a cyclone separator. The raw material powder is preheated and separated from gas and solid in a cyclone preheater of the suspension preheating system, and the raw material powder after multiple heat exchange and gas and solid separation enters a calcining furnace system from a penultimate cyclone preheater of the suspension preheating system. The temperature distribution in the preheating furnace and the modifying furnace is monitored in real time by arranging a plurality of temperature measuring points in a layering manner in the height direction of the preheating furnace and the modifying furnace, and the temperature distribution in the preheating furnace and the modifying furnace is controlled within a reasonable range by adjusting the amount of fuel and the amount of material fed into the preheating furnace and the modifying furnace, so that the reasonable temperature distribution in the preheating furnace and the modifying furnace can ensure the full decomposition of kaolin and simultaneously ensure that the kaolin is not over-burnt, and the activity of the finished metakaolin meets the requirements of subsequent production. The fuel in the calciner system is combusted to release a large amount of heat for decomposition of kaolin, the decomposed hot materials leave the calciner system, and then the hot materials and hot flue gas are subjected to gas-solid separation in a lowest stage cyclone preheater of the suspension preheating system and then enter a first cooling system. The flue gas at the outlet of the suspension preheating system enters the first cooling system, so that the high-temperature material is prevented from being oxidized again in the cooling process, the hot material is cooled and separated from gas and solid in the cyclone cooler of the first cooling system, and the color is controllable. And the material cooled by the first cooling system enters the second cooling system from the first cooling system after gas-solid separation. And (3) allowing the normal-temperature air to enter a second cooling system, cooling the material entering the second cooling system, further realizing cooling and gas-solid separation of the material in a cyclone cooler of the second cooling system, and finally leaving from a discharging pipe of the lowest-stage cyclone cooler of the second cooling system to fall into a finished product zipper machine to finally obtain a finished product meeting the requirement.
The air after heat exchange leaves from an air outlet of the uppermost stage cyclone cooler of the second cooling system, and then is divided into the following three paths: the first path enters a calcining furnace system through the bottom of a preheating furnace, the second path enters an oxidizing furnace connected above a lowest stage cyclone preheater of the suspension preheating system, and the third path enters a drying crusher to dry raw materials or perform waste heat utilization in other forms. The excess air coefficient in the calcining furnace system is less than 1.0 by reasonably controlling the air quantity and the fuel quantity entering the calcining furnace system, and the fuel in the calcining furnace system is incompletely combusted to form a reducing atmosphere, so that Fe in the raw materials is reduced3+Reduction to Fe2+Fe in metakaolin2+And finally exists in the form of magnetite, so that the metakaolin finished product presents a gray black color. Flue gas formed by incomplete combustion of fuel and decomposition of kaolin in the calciner system leaves the calciner system, enters the suspension preheating system, then enters the oxidation furnace, part of air subjected to heat exchange by the second cooling system enters the oxidation furnace, and fully reacts with unburned fuel and CO in the flue gas to ensure full combustion of the fuel and full release of heat energy, then raw meal fed into the suspension preheating system is subjected to multiple preheating and gas-solid separation, finally leaves from an air outlet of a cyclone preheater at the top of the suspension preheating system, then circularly enters the first cooling system through a circulating fan to cool high-temperature materials entering the first cooling system, circulating flue gas subjected to heat exchange leaves from an air outlet of a cyclone cooler at the top of the first cooling system, then enters the drying and breaking system to dry the raw materials, and finally flue gas after waste heat utilization is subjected to gas-solid separation by the cyclone separator and then enters the dust collector and the flue gas treatment system, after treatment, the mixture is discharged into the atmosphere.
According to the difference of the water content of the raw materials, the system can be matched with an independent hot blast furnace system. When the enthalpy carried by the smoke and the air at the outlets of the first cooling system and the second cooling system can not meet the raw material drying requirement, the hot blast stove system can be started to prepare hot air to enter the drying crusher for drying the raw material.
The invention has the following advantages and beneficial effects:
1) the calcining furnace system provided by the invention reasonably designs the combustion-supporting air quantity and the fuel consumption, so that the fuel in the calcining furnace system is incompletely combusted, the calcining furnace system is in a reducing atmosphere, and further the Fe in the raw materials is reduced3+Reduction to Fe2+Greatly reduces Fe in metakaolin from the source3+The concentration effectively reduces the difficulty of controlling the color of the metakaolin finished product.
2) The calcining furnace system and the oxidizing furnace system provided by the invention are connected through the cyclone preheater, and Fe in the raw materials3+Is reduced to Fe in a calciner system2+And finally exists in the form of magnetite, so that the metakaolin finished product presents a gray black color. The prepared metakaolin is subjected to gas-solid separation by a cyclone preheater and then sequentially enters a first cooling system and a second cooling system, and the flue gas containing CO enters an oxidation furnace. The oxidation furnace provided by the invention fully utilizes the air after heat exchange of the second cooling system, and fully reacts with unburned fuel and CO in the flue gas entering the oxidation furnace, so that the full burnout of the fuel and the full release of heat energy are ensured while the environment pollution caused by CO discharge is avoided, and the operation cost of the system is reduced.
3) The invention is provided with a first cooling system and a second cooling system in sequence, and the two systems have definite functional positioning. Wherein, the first cooling system makes full use of the low-oxygen flue gas at the outlet of the suspension preheating system to carry out primary cooling on the metakaolin, so that the metakaolin does not contain high-concentration O2To avoid Fe in metakaolin2+The magnetite in the form is oxidized to Fe in contact with a large amount of oxygen during cooling3+(ii) a Meanwhile, the metakaolin is cooled to a safe temperature range of 300-350 ℃ and below through primary cooling by reasonably designed low-oxygen circulating smoke amount. The second cooling system makes full use of the conventional air to carry out secondary cooling on the metakaolin to about 100 ℃.
4) The flue gas and the air at the outlets of the suspension preheating system, the first cooling system and the second cooling system are fully recycled, so that the heat consumption of the system can be effectively reduced, and the production cost is reduced.
Drawings
Fig. 1 is a flow chart of a system for preparing high activity metakaolin with controllable finished color according to an embodiment of the present invention.
In the figure: 1. a suspension preheating system; 1-1, a cyclone preheater; 1-2, an oxidation furnace; 2. a calciner system; 2-1, preheating a furnace; 2-2, a modification furnace; 3. a first cooling system; 3-1, a first cyclone cooler; 4. a second cooling system; 4-1, a second cyclone cooler; 5. a drying and crushing system; 6. a cyclone separator; 7. a hot blast stove system.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
Referring to fig. 1, the present embodiment provides a system for preparing high-activity metakaolin with controllable finished product color, which includes a drying and crushing system 5 for drying and crushing raw materials, a suspension preheating system 1, a calciner system 2, a first cooling system 3, and a second cooling system 4.
And a material outlet of the drying and crushing system 5 is connected with the suspension preheating system 1 through a cyclone separator 6, and separated flue gas enters a dust collector and a flue gas treatment system and is discharged into the atmosphere after being treated. And a heat source inlet of the drying and crushing system 5 is connected with an air outlet of the first cooling system 3, and/or is connected with an air outlet of the second cooling system 4, and/or is connected with a hot blast stove system 7.
The suspension preheating system 1 comprises a multistage cyclone preheater 1-1, a high-efficiency material scattering device, a connecting pipeline and the like, and the preferred stage number of the cyclone preheater 1-1 of the suspension preheating system 1 is three-seven, and the suspension preheating system is used for preheating raw materials. The calcining furnace system 2 comprises a high-efficiency material scattering device, a combustion-supporting air inlet pipeline, a preheating furnace 2-1, a first combustor arranged on the conical part of the preheating furnace 2-1, a modifying furnace 2-2, a second combustor arranged on the conical part of the modifying furnace 2-2, a third combustor arranged in the middle of the modifying furnace 2-2, a flue gas outlet pipeline and the like, wherein a fuel feeding port and a raw material feeding port are respectively arranged on the preheating furnace 2-1 and the modifying furnace 2-2, a discharge port of a penultimate cyclone preheater 1-1 of the suspension preheating system 1 is respectively connected with the raw material feeding port of the preheating furnace 2-1 and the raw material feeding port of the modifying furnace 2-2, and a reduction zone is arranged in the modifying furnace 2-2.
The bottom of the preheating furnace 2-1 is provided with a combustion-supporting air inlet, the preheating furnace 2-1 sequentially comprises a preheating furnace cone, a preheating furnace cylinder and a preheating furnace necking from bottom to top, a fuel feeding port of the preheating furnace 2-1 is positioned on the preheating furnace cone, and a raw material feeding port of the preheating furnace 2-1 is positioned on the preheating furnace cylinder; the modification furnace 2-2 sequentially comprises a modification furnace cone and a modification furnace cylinder from bottom to top, a fuel feeding port of the modification furnace 2-2 is positioned on the middle parts of the modification furnace cone and the modification furnace cylinder, a raw material feeding port of the modification furnace 2-2 is respectively positioned at the bottom and the middle part of the modification furnace cylinder, a top outlet of the preheating furnace 2-1 is connected with a bottom inlet of the modification furnace 2-2, and a top outlet of the modification furnace 2-2 is connected with an inlet of the lowest stage cyclone preheater 1-1 of the suspension preheating system 1.
An oxidation furnace system is arranged between the air outlet of the lowest stage cyclone preheater 1-1 and the inlet of the penultimate cyclone preheater 1-1 of the suspension preheating system 1, the oxidation furnace system comprises a hot air inlet pipeline, an oxidation furnace 1-2, a fourth burner arranged on the cone part of the oxidation furnace 1-2, a fifth burner arranged in the middle of the oxidation furnace 1-2, a flue gas outlet pipeline and the like, the bottom inlet of the oxidation furnace 1-2 is connected with the air outlet of the lowest stage cyclone preheater 1-1 of the suspension preheating system 1, the top outlet of the oxidation furnace 1-2 is connected with the inlet of the penultimate cyclone preheater 1-1 of the suspension preheating system 1, at the moment, the discharge port of the penultimate cyclone preheater 1-1 of the suspension preheating system 1 enters a connecting pipeline between the oxidation furnace 1-2 and the inlet of the penultimate cyclone preheater 1-1, the oxidation furnace 1-2 is provided with a fuel feeding port and a combustion-supporting air inlet, the oxidation furnace 1-2 sequentially comprises an oxidation furnace cone and an oxidation furnace cylinder from bottom to top, the fuel feeding port of the oxidation furnace 1-2 is positioned on the middle parts of the oxidation furnace cone and the oxidation furnace cylinder, the combustion-supporting air inlet of the oxidation furnace 1-2 is positioned on the oxidation furnace cylinder, and an oxidation zone is arranged in the oxidation furnace 1-2.
Suspension preheating system 1's the 3 material entry connections of lower level cyclone preheater 1-1 discharge gates and first cooling system, first cooling system 3's cooling method is the forced air cooling, first cooling system 3's cooling medium is inert gas or low oxygen flue gas, and oxygen concentration control is below 4% in the low oxygen flue gas, first cooling system 3 is at least one-level suspension cooling, and this embodiment is tertiary suspension cooling, including tertiary cyclone cooler 3-1, high-efficient material device and connecting tube etc. of spilling, inert gas or low oxygen flue gas entering first cooling system 3, use Fe in the metakaolin that makes reduction calcination preparation2+The magnetite in the form can not be oxidized into Fe again in the cooling link3+The first cooling system 3 cools the material to 200-Connecting; the material outlet of the first cooling system 3 is connected with the material inlet of the second cooling system 4, the cooling mode of the second cooling system 4 is air cooling, the cooling medium of the second cooling system 4 is conventional air, the second cooling system 4 is at least one-stage suspension cooling, the embodiment is two-stage suspension cooling and comprises a second-stage cyclone cooler 4-1, a high-efficiency material scattering device, a connecting pipeline and the like, and the air outlet of the second cooling system 4 is respectively connected with the combustion-supporting air inlet of the preheating furnace 2-1, the combustion-supporting air inlet of the oxidizing furnace 1-2 and the heat source inlet of the drying and crushing system 5.
Considering that the oxygen concentration in the flue gas at the outlet of the suspension preheating system 1 can be controlled at 2-3%, the suspension preheating system can be used for realizing the first-stage quenching of hot materials in the first cooling system 3, and the top gas outlet of the suspension preheating system 1 is connected with the gas inlet of the first cooling system 3.
In addition, for the material collapsing risk that the system cuts off the power supply suddenly or other troubles lead to appear in avoiding production process, be provided with emergent surge bin in second cooling system 4 coolant inlet bottom, emergent surge bin entrance is provided with the valve, and when the system cuts off the power supply suddenly or other troubles appear, the last valve of emergent surge bin is opened, and finished product metakaolin unloads finished product zip fastener machine through emergent surge bin, ensures system safety.
The specific preparation method of the high-activity metakaolin with controllable finished product color comprises the following steps:
the method comprises the steps that after being dried and crushed by a drying and crushing system 5, raw materials are collected by a cyclone separator 6 and are sent into a suspension preheating system 1, the raw materials enter a calcining furnace system 2 after being preheated by the suspension preheating system 1, the calcining temperature in the preheating furnace 2-1 and a modification furnace 2-2 is controlled to be 650-1000 ℃ by adjusting the amount of air, the amount of fuel and the amount of materials fed into a preheating furnace 2-1 and a modification furnace 2-2, and a combustion environment of a reducing atmosphere is formed in the calcining furnace system 2 (the coefficient of excess air in the calcining furnace system 2 is less than 1.0), so that the fuel is not fully combusted, kaolin is fully decomposed, and Fe in the raw materials is fully combusted3+Reduction to Fe2+And finally exists in the form of magnetite, so that the metakaolin finished product presents a gray black color. Meanwhile, the kaolin is not over-burnt, so that the activity of the metakaolin finished product meets the requirement of subsequent production. The calcining furnaceThe residence time of the gas in the system 2 is 2-10 s.
The decomposed hot materials and hot flue gas leave the calcining furnace system 2 and enter the lowest stage cyclone preheater 1-1 of the suspension preheating system 1 for gas-solid separation, the hot flue gas then enters the oxidizing furnace system (the excess air coefficient in the oxidizing furnace system is more than 1.0), and a combustion environment of an oxidizing atmosphere is formed in the oxidizing furnace 1-2 by adjusting the air quantity and the fuel quantity fed into the oxidizing furnace system, so that the unburnt fuel in the hot flue gas is fully burnt out, and simultaneously, the hot flue gas fully reacts with CO, and then the hot flue gas continuously moves upwards to preheat the raw materials.
The decomposed hot material (metakaolin) enters a first cooling system 3, the oxygen concentration of a cooling medium of the first cooling system 3 is below 4%, and inert gas or low-oxygen flue gas can be selected to enable the metakaolin to be Fe2+The magnetite in the form of magnetite is not oxidized again to Fe in the cooling process3+The material is cooled to 350 ℃ through the first cooling system 3, and the hot material is cooled and separated from gas and solid in a cyclone cooler I3-1 of the first cooling system 3; the flue gas at the outlet of the first cooling system 3 enters a drying and crushing system 5 again to provide a heat source for drying the raw materials.
The material cooled by the first cooling system 3 enters the second cooling system 4, the cooling medium of the second cooling system 4 is conventional air, the material is cooled to about 100 ℃ by the second cooling system 4, the material is further cooled and separated from gas and solid in the cyclone cooler II 4-1 of the second cooling system 4, and finally the material leaves from the blanking pipe of the cyclone cooler II 4-1 at the lowest stage and falls into a finished product zipper machine to obtain a finished product meeting the requirement. The flue gas at the outlet of the second cooling system 4 enters the preheating furnace 2-1, the oxidation furnace 1-2 and the drying and crushing system 5.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or some or all of the technical features may be equivalently replaced, and the modifications or the replacements may not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A high-activity metakaolin preparation system with controllable finished product color is characterized by comprising a suspension preheating system, a calcining furnace system, a first cooling system and a second cooling system, wherein the calcining furnace system comprises a preheating furnace and a modification furnace, the bottom of the preheating furnace is provided with a combustion-supporting air inlet, the top outlet of the preheating furnace is connected with the bottom inlet of the modification furnace, the top outlet of the modification furnace is connected with the inlet of the lowest stage cyclone preheater of the suspension preheating system, the discharge port of the penultimate second stage cyclone preheater of the suspension preheating system is respectively connected with a raw material feeding port of the preheating furnace and a raw material feeding port of the modification furnace, the preheating furnace and the modification furnace are respectively provided with a fuel feeding port and a raw material feeding port, and the interior of the modification furnace is a reduction zone;
an oxidation furnace system is arranged between the air outlet of the lowest stage cyclone preheater of the suspension preheating system and the inlet of the penultimate cyclone preheater, the oxidation furnace system comprises an oxidation furnace, the bottom inlet of the oxidation furnace is connected with the air outlet of the lowest stage cyclone preheater of the suspension preheating system, the top outlet of the oxidation furnace is connected with the inlet of the penultimate cyclone preheater of the suspension preheating system, a fuel feeding port and a combustion-supporting air inlet are arranged on the oxidation furnace, and an oxidation area is arranged in the oxidation furnace;
the discharge port of the lowest stage cyclone preheater of the suspension preheating system is connected with a material inlet of a first cooling system, the first cooling system comprises at least one stage of cyclone cooler, the oxygen concentration of a cooling medium of the first cooling system is below 4%, the first cooling system is used for cooling the material to 200-350 ℃, a material outlet of the first cooling system is connected with a material inlet of a second cooling system, the second cooling system comprises at least one stage of cyclone cooler, the cooling medium of the second cooling system is conventional air, and an air outlet of the second cooling system is respectively connected with a combustion-supporting air inlet of the preheating furnace and a combustion-supporting air inlet of the oxidizing furnace.
2. The system for preparing high-activity metakaolin with controllable finished color according to claim 1, wherein an outlet at the top of the suspension preheating system is connected with an inlet of the first cooling system.
3. The system for preparing high-activity metakaolin with controllable finished color according to claim 1, wherein the preheating furnace is composed of a preheating furnace cone, a preheating furnace cylinder and a preheating furnace throat from bottom to top in sequence, a fuel feeding port of the preheating furnace is positioned on the preheating furnace cone, and a raw material feeding port of the preheating furnace is positioned on the preheating furnace cylinder;
the modifying furnace sequentially comprises a modifying furnace cone and a modifying furnace cylinder from bottom to top, wherein a fuel feeding port of the modifying furnace is positioned on the middle parts of the modifying furnace cone and the modifying furnace cylinder, and a raw material feeding port of the modifying furnace is respectively positioned at the bottom and the middle part of the modifying furnace cylinder;
the oxidation furnace is sequentially composed of an oxidation furnace cone and an oxidation furnace cylinder from bottom to top, a fuel feeding port of the oxidation furnace is positioned on the middle parts of the oxidation furnace cone and the oxidation furnace cylinder, and a combustion-supporting air inlet of the oxidation furnace is positioned on the oxidation furnace cylinder.
4. The system for preparing high-activity metakaolin with controllable finished product color according to claim 1, further comprising a drying and crushing system for drying and crushing raw materials, wherein a material outlet of the drying and crushing system is connected with the suspension preheating system through a cyclone separator; and a heat source inlet of the drying and crushing system is connected with an air outlet of the first cooling system, and/or is connected with an air outlet of the second cooling system, and/or is connected with a hot blast stove system.
5. A preparation method for preparing high-activity metakaolin with controllable finished product color according to the preparation system of any one of claims 1-4, characterized in that the method comprises the steps of preheating raw materials by a suspension preheating system, then feeding the raw materials into a calciner system, forming a combustion environment of a reducing atmosphere with an excess air coefficient less than 1.0 in the calciner system, and forming a combustion environment of an oxidizing atmosphere with an excess air coefficient greater than 1.0 in an oxidation furnace; the calcining temperature in the calcining furnace system is 650-1000 ℃, the flue gas formed by incomplete combustion of fuel and decomposition of kaolin in the calcining furnace system enters the lowest stage cyclone preheater of the suspension preheating system along with decomposed materials, the flue gas then enters the oxidizing furnace system, unburned fuel in the flue gas in the oxidizing furnace system is fully burned out, and simultaneously, CO and combustion-supporting air entering the oxidizing furnace are fully reacted; the material separated by the lowest stage cyclone preheater of the suspension preheating system enters a first cooling system, the oxygen concentration of a cooling medium of the first cooling system is below 4%, the material is cooled to 350 ℃ by the first cooling system, and then the material enters a second cooling system, and is cooled to 60-150 ℃ by the second cooling system, so that the finished product of the metakaolin with controllable color is obtained.
6. The method for preparing the high-activity metakaolin with the controllable finished product color according to claim 5, wherein the coefficient of excess air in the calcining furnace system is 0.5-1.0; the excess air coefficient in the oxidation furnace is 1.0-1.2.
7. The method for preparing high-activity metakaolin with controllable color according to claim 5, wherein the cooling medium of the first cooling system is inert gas or low-oxygen flue gas, the oxygen concentration in the low-oxygen flue gas is controlled below 4%, and the cooling medium of the second cooling system is normal air.
8. The method of claim 7, wherein the low-oxygen flue gas is from the top outlet of the suspension preheating system.
9. The method for preparing high-activity metakaolin with controllable finished product color according to claim 5, wherein the flue gas from the outlet of the first cooling system enters a drying and crushing system, and the flue gas from the outlet of the second cooling system enters a preheating furnace, an oxidation furnace and a drying and crushing system.
10. The method for preparing the high-activity metakaolin with the controllable finished product color according to claim 5, wherein the retention time of gas in the calcining furnace system is 2-10 s.
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| CN116535117A (en) * | 2023-05-08 | 2023-08-04 | 天津水泥工业设计研究院有限公司 | A metakaolin preparation system and method capable of realizing decoupling function |
| CN116535117B (en) * | 2023-05-08 | 2024-11-22 | 天津水泥工业设计研究院有限公司 | A metakaolin preparation system and method capable of realizing decoupling function |
| WO2025035546A1 (en) * | 2023-08-16 | 2025-02-20 | 中材建设有限公司 | Efficient clay suspension calcining system capable of controlling color of product |
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