CN108165734A - A kind of sintered technique and system - Google Patents
A kind of sintered technique and system Download PDFInfo
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- CN108165734A CN108165734A CN201810140829.XA CN201810140829A CN108165734A CN 108165734 A CN108165734 A CN 108165734A CN 201810140829 A CN201810140829 A CN 201810140829A CN 108165734 A CN108165734 A CN 108165734A
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- sintering
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
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- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention discloses a kind of sintered technique, including：Prepared by sintering feed, embedded material obtains and blending process；Sintering feed preparation includes mixed processes and granulation process；Mixed processes：The fuel and fluxing agent of powdery are added in Iron Ore Powder, by Iron Ore Powder, fuel and fluxing agent mixing, forms mixture；Granulation process：Water is added in into mixture, mixture is preheated using steam, mixture is prepared into granular sintering feed；Embedded material acquisition includes pelletizing feed screening process and embedded material storage process；Pelletizing feed sieves process：Pellet under Ferrous Metallurgy pelletizing or blast furnace process slot is sieved, screens out return fines material；Embedded material storage process：Return fines material is transported to pellet screening storehouse and is stored；Blending process：Sintering feed and return fines material are delivered to uniform mixing equipment and carry out mixing, return fines material is evenly distributed on as embedded material in sintering feed, forms the built-in type sintered material of pellet screening.The present invention improves the permeability of sintering feed.
Description
Technical Field
The invention relates to a ferrous metallurgy sintering process and a system, in particular to a return mine sintering process and a system.
Background
In the metallurgy sintering production of iron and steel, if the proportion of fine-grained iron concentrate powder is too high, the yield of sintered ore is low due to poor air permeability of a material layer, and the power consumption of a main exhaust fan is increased due to high negative pressure of required air draft. The conventional method for solving the problem is to prolong the total time of mixing and pelletizing of materials, and simultaneously increase the usage amount of the calcined flux quicklime and the like with double functions of the binder and the activator so as to improve the mixing and pelletizing effects and improve the sintering performance. However, in order to prolong the total mixing and pelletizing time, on one hand, the specification of equipment needs to be increased, the investment is increased, on the other hand, the total optimal mixing and pelletizing time of the mixed materials also has a certain limit value, generally 6-8 minutes, and the increased value of the pelletizing effect is rapidly reduced when the time limit value is exceeded. In addition, the maximum usage of quicklime is limited by the basicity of the sintered ore and the cost.
Disclosure of Invention
In order to solve the problems, the invention provides a return mine sintering process for improving the air permeability of a sintering mixture.
In order to achieve the above object, the present invention provides a return sintering process, comprising: preparing a sintering material, obtaining an embedding material and uniformly mixing;
the preparation of the sintering material comprises a sintering material mixing process and a sintering material granulating process; wherein,
the sintering material mixing procedure: adding powdery fuel and fluxing agent into the iron ore powder, and uniformly mixing the iron ore powder, the fuel and the fluxing agent to form a mixture;
the sintering material granulation procedure comprises the following steps: adding water into the mixture, preheating the mixture by adopting steam, and preparing the mixture into granular sintering materials;
the embedded material obtaining comprises a pellet material screening process and an embedded material storage process; wherein,
the pellet screening process comprises the following steps: screening the ferrous metallurgy pellets or pellets below a blast furnace smelting tank to obtain returned ore materials;
the embedding material storage procedure comprises the following steps: transporting the returned ore material to a pellet returned ore bin for storage;
the blending process comprises the following steps: and conveying the sintering material and the mineral return material to a mixing device for mixing uniformly, wherein the mineral return material is uniformly distributed in the sintering material as an embedded material to form the pellet mineral return embedded sintering material.
Further, the average rate of inputting the return mineral aggregate into the ore return bin in the embedding material storage procedure is an input rate, the rate of outputting the return mineral aggregate from the ore return bin in the blending process is an output rate, and the input rate is equal to the output rate.
Further, the blending process also comprises a material taking process;
the material taking process comprises the following steps: taking out the sintering material and the return fines at a uniform rate, and controlling the return fines to be uniformly added into the sintering material.
Further, the screening process also comprises a screen hole adjusting operation;
the sieve pore adjusting operation comprises the following steps: adjusting the aperture of the sieve pores to be not more than 5 mm.
The invention takes the pellet return fines screened from the ferrous metallurgy pellets or the pellet return fines screened from the lower part of the blast furnace smelting tank as coarse particles and evenly mixes the coarse particles into the sintering mixture after mixing and pelletizing are finished, because the pellet return fines have high strength and low caking property, the pellet return fines can support the pressure of the upper material to form a relatively loose layer around the upper material to generate an edge effect, and the air permeability is improved. The coarse particles are distributed uniformly in the bed of material to form an interconnected gas-permeable network, thereby improving the gas permeability of the material as a whole.
The pellet return fines, namely the small pellets with unqualified blast furnace smelting particle size requirements, are normally used as recyclable waste materials, have the characteristics of reliable sources, low cost, high strength, dryness, high iron content and the like, and meet the technical requirements of being used as sintering embedded materials.
In order to achieve the purpose, the invention provides a return mine sintering system, which comprises sintering material preparation equipment, embedded material obtaining equipment and blending equipment; wherein,
the sintering material preparation equipment comprises a primary cylinder mixer and a secondary cylinder mixer, wherein a primary conveyor is arranged between an outlet of the primary cylinder mixer and an inlet of the secondary cylinder mixer, and a secondary conveyor is arranged at an outlet of the secondary cylinder mixer;
the embedded material obtaining equipment comprises a screening device and an ore returning bin; the screening device is used for screening the return ore from the pellets, the return bin is used for storing the return ore, a discharge hole of the return bin is provided with a batching device, and the discharge hole of the batching device is communicated with the secondary conveyor;
and the feed inlet of the blending equipment is communicated with the discharge end of the secondary conveyor.
Further, the secondary conveyor is a belt conveyor, and a discharge hole of the batching equipment is arranged above the belt conveyor.
Further, the batching equipment comprises an ore feeding valve of the belt conveyor and an electronic belt scale, wherein an outlet of the ore feeding valve is arranged above the electronic belt scale, and a discharging end of the electronic belt scale is arranged above the belt conveyor.
Further, the blending equipment is a wheel mixer, an outlet of the wheel mixer is arranged above the sintering belt conveyor, and a discharge end of the sintering belt conveyor is arranged above a charging section of the sintering machine.
Furthermore, the sieve is provided with a pore size adjusting device for adjusting the pore size of the sieve.
Furthermore, a feed inlet of the primary cylinder mixer is connected with an iron ore powder input device, a fluxing agent input device and a fuel input device, and the secondary cylinder mixer is also communicated with a water supply pipeline and a steam pipeline.
The sintering system using the pellet return fines as the embedded material uniformly mixes the pellet return fines screened from the ferrous metallurgy pellets or the pellet return fines screened from the lower part of the blast furnace smelting tank as coarse particles into the sintering mixture after mixing and pelletizing are finished, and because the pellet return fines have high strength and low caking property, the pellet return fines can support the pressure of upper materials to form a relatively loose layer around the upper materials to generate an edge effect, so that the air permeability is improved. The coarse particles are distributed uniformly in the bed of material to form an interconnected gas-permeable network, thereby improving the gas permeability of the material as a whole.
The sintering system with the pellet return ores as the embedded materials can greatly improve the air permeability of the sintering materials, and has the advantages of investment saving, quick response, simplicity and feasibility, and no need of special equipment, materials and raw materials.
The sintering system using the pellet return ores as the embedding materials has the advantages of low cost and reliable sources by using the pellet return ores as the embedding materials of the sintering technology.
The sintering system using the pellet return ores as the embedding materials does not need to additionally build a special embedding material production workshop, and one-time construction investment is saved.
Drawings
FIG. 1 is a block diagram of a sintering system with pellet return as an insertion material according to the present invention;
fig. 2 is a schematic diagram of the pellet return fines embedded sintering material mixed in the sintering process using the pellet return fines as the embedded material according to the present invention.
Detailed Description
The invention is further described with reference to the accompanying drawings.
Example 1
The embodiment provides a return sintering process, which comprises the following steps: preparing a sintering material, obtaining an embedding material and uniformly mixing;
the preparation of the sintering material comprises a sintering material mixing process and a sintering material granulating process; wherein,
the sintering material mixing procedure: adding powdery fuel and fluxing agent into the iron ore powder, and uniformly mixing the iron ore powder, the fuel and the fluxing agent to form a mixture;
the sintering material granulation procedure comprises the following steps: adding water into the mixture, preheating the mixture by adopting steam, and preparing the mixture into granular sintering materials;
the embedded material obtaining comprises a pellet material screening process and an embedded material storage process; wherein,
the pellet screening process comprises the following steps: firstly, adjusting sieve pores to 5mm, sieving the metallurgical pellets or pellets below a blast furnace smelting tank to obtain returned ore materials;
the embedding material storage procedure comprises the following steps: transporting the returned ore material to a pellet returned ore bin for storage;
the blending process comprises the following steps: and conveying the sintering material and the mineral return material to a mixing device for mixing uniformly, wherein the mineral return material is uniformly distributed in the sintering material as an embedded material to form the pellet mineral return embedded sintering material.
According to the return-ore sintering process, the steel metallurgical pellets or the pellets below the blast furnace smelting tank are screened, the qualified pellets are subjected to the next smelting production, the unqualified pellets are recycled as the embedded material, and the pellets can be fully utilized.
In the return-ore sintering process of the embodiment, the pellet return ores screened from the ferrous metallurgy pellets or the pellet return ores screened from the lower part of the blast furnace smelting tank are used as coarse particles and are uniformly mixed into the sintering mixture after mixing and pelletizing are completed, as shown in fig. 1, because the pellet return ores 2 have high strength and low caking property, the pressure of the upper material 1 can be supported, and a relatively loose layer 3 is formed around the upper material 1 to generate an edge effect, so that the air permeability is improved. A plurality of pellet return ores 2 are uniformly distributed in the material layer 1 to form an interconnected air permeability network, thereby improving the air permeability of the material as a whole.
The pellet return fines utilized by the return fines sintering process of the embodiment, namely the small pellets with unqualified blast furnace smelting particle size requirements, are generally utilized as recyclable waste materials, have reliable sources and low cost, have the characteristics of high strength, dryness, high iron content and the like, and meet the technical requirements of being used as sintering embedded materials.
Example 2
On the basis of the above embodiment, the average rate of inputting the return mineral aggregate into the ore return bin in the embedded aggregate storage procedure is an input rate, the rate of outputting the return mineral aggregate from the ore return bin in the blending process is an output rate, and the input rate is equal to the output rate.
In this embodiment, the consumption speed of the returned ore material is controlled to be the same as the growth speed, so that the returned ore material is prevented from being accumulated in a large amount and occupying too much space, and the returned ore material is added into the sintering material all the time.
Example 3
On the basis of the embodiment, the uniformly mixing process also comprises a material taking process; the material taking process comprises the following steps: taking out the sintering material and the return fines at a uniform rate, and controlling the return fines to be uniformly added into the sintering material.
In this embodiment, the sintering material and the return fines are all taken out at an even rate, and then the return fines are evenly added into the sintering material, so that the return fines and the sintering material are basically in an evenly mixed state before entering the blending equipment, the working time of the blending equipment can be reduced, and the production efficiency can be improved.
Example 1
As shown in fig. 2, the present embodiment provides a return sintering system, which includes a sintered material preparation apparatus, an embedded material obtaining apparatus, and a blending apparatus 40; wherein,
the sintering material preparation equipment comprises a primary cylinder mixer and a secondary cylinder mixer 10, wherein a primary conveyor is arranged between the outlet of the primary cylinder mixer and the inlet of the secondary cylinder mixer 10, and a secondary conveyor 30 is arranged at the outlet of the secondary cylinder mixer 10;
the embedded material obtaining equipment comprises a screening device and a return bin 20; the screen is used for screening the return ores from the pellets, the return bin 20 is used for storing the return ores, a material outlet of the return bin 20 is provided with a batching device, and a material outlet of the batching device is communicated with the secondary conveyor 30;
and the feed inlet of the blending equipment 40 is communicated with the discharge end of the secondary conveyor 30.
As shown in fig. 1, the sintering system using return pellet ore as an embedded material of the present invention uniformly mixes return pellet ore 2 screened from ferrous metallurgical pellets or screened from the bottom of a blast furnace smelting bath as coarse particles into a sintering mixture 1 that has been mixed and pelletized, and because the return pellet ore 2 has high strength and low caking property, it can support the pressure of the upper material 1 and form a relatively loose layer 3 around it to generate an "edge effect" to improve air permeability. The coarse particles are distributed uniformly in the bed of material to form an interconnected gas-permeable network, thereby improving the gas permeability of the material as a whole.
The sintering system with the pellet return ores as the embedded materials can greatly improve the air permeability of the sintering materials, and has the advantages of investment saving, quick response, simplicity and feasibility, and no need of special equipment, materials and raw materials.
The sintering system using the pellet return ores as the embedding materials has the advantages of low cost and reliable sources by using the pellet return ores as the embedding materials of the sintering technology.
The sintering system using the pellet return ores as the embedding materials does not need to additionally build a special embedding material production workshop, and one-time construction investment is saved.
Example 2
On the basis of the above embodiment, the secondary conveyor 30 is a belt conveyor, and the discharge port of the batching device is arranged above the belt conveyor.
In this embodiment, the secondary conveyor 30 is a belt conveyor, and since the upper side of the belt conveyor is an open structure, the batching equipment can directly output the return fines to the sinter on the belt conveyor, and in addition, the belt conveyor can produce a certain blending effect during discharging, so that the running time of the blending equipment 40 can be saved.
Example 3
On the basis of the above embodiment, the batching apparatus includes an ore feeding valve 21 of the belt conveyor and an electronic belt scale 22, an outlet of the ore feeding valve 21 is arranged above the electronic belt scale 22, and a discharging end of the electronic belt scale 22 is arranged above the belt conveyor.
In this embodiment, the belt conveyor feeding valve 21 and the electronic belt scale 22 are matched to control the material output rate in the ore return bin 20, so that the material output rate of the ore return bin 20 is kept uniform, and thus, the ore return material and the sintering material can be substantially uniformly distributed before entering the blending device 40, the operation time of the blending device 40 can be reduced, and the tea production efficiency is improved.
In addition to the above embodiments, the particle size of the return fines may be changed according to different process parameters, and therefore, the screen may be provided with a pore size adjusting device for adjusting the pore size of the screen.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (10)
1. A return fine sintering process comprises the processes of sintered material preparation, embedded material obtaining and uniform mixing; the preparation of the sintering material comprises a sintering material mixing process and a sintering material granulating process; wherein the sintering material mixing process: adding powdery fuel and fluxing agent into the iron ore powder, and uniformly mixing the iron ore powder, the fuel and the fluxing agent to form a mixture; the sintering material granulation procedure comprises the following steps: adding water into the mixture, preheating the mixture by adopting steam, and preparing the mixture into granular sintering materials; the embedded material obtaining comprises a pellet material screening process and an embedded material storage process; wherein the pellet screening process comprises: screening the ferrous metallurgy pellets or pellets below a blast furnace smelting tank to obtain returned ore materials; the embedding material storage procedure comprises the following steps: transporting the returned ore material to a pellet returned ore bin for storage; the blending process comprises the following steps: and conveying the sintering material and the mineral return material to a mixing device for mixing uniformly, wherein the mineral return material is uniformly distributed in the sintering material as an embedded material to form the pellet mineral return embedded sintering material.
2. The return ore sintering process according to claim 1, characterized in that: the average rate of inputting the return mineral aggregate into the ore return bin in the embedding material storage procedure is an input rate, the rate of outputting the return mineral aggregate from the ore return bin in the blending process is an output rate, and the input rate is equal to the output rate.
3. The return ore sintering process according to claim 1, characterized in that: the blending process also comprises a material taking process; the material taking process comprises the following steps: taking out the sintering material and the return fines at a uniform rate, and controlling the return fines to be uniformly added into the sintering material.
4. The sintering process of the pellet return fines as an embedded material according to claim 1, characterized in that: the screening process also comprises screen hole adjusting operation; the sieve pore adjusting operation comprises the following steps: adjusting the aperture of the sieve pores to be not more than 5 mm.
5. A return fines sintering system, characterized by: comprises sintering material preparation equipment, embedded material obtaining equipment and blending equipment; the sintering material preparation equipment comprises a primary cylinder mixer and a secondary cylinder mixer, wherein a primary conveyor is arranged between an outlet of the primary cylinder mixer and an inlet of the secondary cylinder mixer, and a secondary conveyor is arranged at an outlet of the secondary cylinder mixer; the embedded material obtaining equipment comprises a screening device and an ore returning bin; the screening device is used for screening the return ore from the pellets, the return bin is used for storing the return ore, a discharge hole of the return bin is provided with a batching device, and the discharge hole of the batching device is communicated with the secondary conveyor; and the feed inlet of the blending equipment is communicated with the discharge end of the secondary conveyor.
6. A return ore sintering system according to claim 5, wherein: the secondary conveyor is a belt conveyor, and a discharge port of the batching equipment is arranged above the belt conveyor.
7. A return ore sintering system according to claim 6, wherein: the batching equipment comprises an ore feeding valve of the belt conveyor and an electronic belt scale, wherein an outlet of the ore feeding valve is arranged above the electronic belt scale, and a discharging end of the electronic belt scale is arranged above the belt conveyor.
8. A return ore sintering system according to claim 5, wherein: the blending equipment is a wheel mixer, an outlet of the wheel mixer is arranged above the sintering belt conveyor, and a discharge end of the sintering belt conveyor is arranged above a charging section of the sintering machine.
9. A return ore sintering system according to claim 5, wherein: and the sieve is provided with a pore diameter adjusting device for adjusting the pore diameter of the sieve.
10. A return ore sintering system according to claim 5, wherein: the feeding hole of the primary cylinder mixer is connected with an iron ore powder input device, a fluxing agent input device and a fuel input device, and the secondary cylinder mixer is also communicated with a water supply pipeline and a steam pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810140829.XA CN108165734A (en) | 2018-02-11 | 2018-02-11 | A kind of sintered technique and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810140829.XA CN108165734A (en) | 2018-02-11 | 2018-02-11 | A kind of sintered technique and system |
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| CN108165734A true CN108165734A (en) | 2018-06-15 |
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| CN201810140829.XA Pending CN108165734A (en) | 2018-02-11 | 2018-02-11 | A kind of sintered technique and system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110643809A (en) * | 2019-10-31 | 2020-01-03 | 中冶华天工程技术有限公司 | Sintering method and system with sintering return ores as embedded materials |
| WO2022218044A1 (en) * | 2021-04-16 | 2022-10-20 | 中冶长天国际工程有限责任公司 | Solid waste synergistic sintering and pelletizing disposal process |
| RU2828206C2 (en) * | 2021-04-16 | 2024-10-07 | Чжуне Чантянь Интернэшнл Инжиниринг Ко., Лтд. | Technological method of joint sintering of solid waste and disposal by pelletizing |
-
2018
- 2018-02-11 CN CN201810140829.XA patent/CN108165734A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110643809A (en) * | 2019-10-31 | 2020-01-03 | 中冶华天工程技术有限公司 | Sintering method and system with sintering return ores as embedded materials |
| WO2022218044A1 (en) * | 2021-04-16 | 2022-10-20 | 中冶长天国际工程有限责任公司 | Solid waste synergistic sintering and pelletizing disposal process |
| RU2828206C2 (en) * | 2021-04-16 | 2024-10-07 | Чжуне Чантянь Интернэшнл Инжиниринг Ко., Лтд. | Technological method of joint sintering of solid waste and disposal by pelletizing |
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Application publication date: 20180615 |