CN102390839B - Method for producing artificial wollastonite powder by utilizing Bayer red mud - Google Patents
Method for producing artificial wollastonite powder by utilizing Bayer red mud Download PDFInfo
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- CN102390839B CN102390839B CN 201110235359 CN201110235359A CN102390839B CN 102390839 B CN102390839 B CN 102390839B CN 201110235359 CN201110235359 CN 201110235359 CN 201110235359 A CN201110235359 A CN 201110235359A CN 102390839 B CN102390839 B CN 102390839B
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- 239000000843 powder Substances 0.000 title claims abstract description 45
- 229910052882 wollastonite Inorganic materials 0.000 title claims abstract description 20
- 239000010456 wollastonite Substances 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 title abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 53
- 229910052742 iron Inorganic materials 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 16
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 12
- 239000011572 manganese Substances 0.000 claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 235000010855 food raising agent Nutrition 0.000 claims abstract description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000008188 pellet Substances 0.000 claims description 49
- 239000002002 slurry Substances 0.000 claims description 32
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 30
- 239000006148 magnetic separator Substances 0.000 claims description 29
- 230000005389 magnetism Effects 0.000 claims description 26
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 15
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 239000000428 dust Substances 0.000 claims description 8
- 239000008187 granular material Substances 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 239000013543 active substance Substances 0.000 claims description 7
- SRSXLGNVWSONIS-UHFFFAOYSA-N benzenesulfonic acid Chemical compound OS(=O)(=O)C1=CC=CC=C1 SRSXLGNVWSONIS-UHFFFAOYSA-N 0.000 claims description 7
- 235000021355 Stearic acid Nutrition 0.000 claims description 6
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical group CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 6
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 6
- 239000008117 stearic acid Substances 0.000 claims description 6
- 239000002023 wood Substances 0.000 claims description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims description 5
- 235000013311 vegetables Nutrition 0.000 claims description 5
- 239000012535 impurity Substances 0.000 abstract 1
- 238000005453 pelletization Methods 0.000 abstract 1
- 239000004094 surface-active agent Substances 0.000 abstract 1
- 238000007885 magnetic separation Methods 0.000 description 12
- 239000000126 substance Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000001354 calcination Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005272 metallurgy Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- Compounds Of Iron (AREA)
Abstract
The invention belongs to the technical field of comprehensive utilization of red mud, and in particular relates to a method for producing artificial wollastonite powder by using Bayer red mud. The method mainly comprises the following steps of: grinding and deironing Bayer red mud, diluted hydrochloric acid with the concentration of 0-10 percent and a surfactant in 0.1-0.5 percent by weight of the Bayer red mud, then adding a leavening agent in 0-5 percent by weight of the Bayer red mud and carbon powder in 10 percent by weight of Bayer red mud and pelletizing, carrying out magnetized roasting, and grinding and deironing again to obtain the artificial wollastonite powder, wherein the powder fineness of the artificial wollastonite powder is more than 300 meshes and the content of impurities of iron and manganese in the powder is lower than 0.1 percent. The method disclosed by the invention not only realizes zero emission of the Bayer red mud but also has the capability of producing the artificial wollastonite powder with excellent performance.
Description
Technical field
The invention belongs to the technical field of red mud comprehensive utilization, be specifically related to a kind of method with producing artificial wollastonite powder by utilizing Bayer red mud.
Background technology
Red mud is the solid waste of discharging in the aluminum oxide production process, and it is that present discharge capacity is larger, and harm comparatively seriously is difficult to again one of major industry waste residue that utilizes to physical environment, because its appearance color is gained the name to redness of the skin or complexion earth is similar.At present, most red muds can only be stored up in the mode of the interception of building a dam, and it is stacked in a large number not only land occupation, waste resource but also brings environmental pollution and potential safety hazard.At present, the annual discharging in whole world red mud is approximately 6,000 ten thousand tons.China's aluminum oxide output was approximately about 9,500,000 tons in 2006, and about 1,000 ten thousand tons of discharging red muds add aggregate value method of weighting storage over the years, and its quantity surpasses 100,000,000 tons, and utilization ratio only is about 15%.At present, mainly concentrate on it for the main utilization of Bayer red mud and to make building block brick, cement raw material, refinement iron, to refine rare earth metal etc., but all have many problems, some in addition also have problem to secondary environmental pollution.So far red mud pilling still takies a large amount of soils, but also easily causes the pollution of soil alkalization and water system, also is the waste of resource simultaneously, has seriously hindered the Sustainable development of aluminium industry.
Wollastonite belongs to a kind of chain metasilicate, is again a kind of fibrous, needle-like that is.Because its special crystal habit crystalline texture has determined, wollastonite has good insulativity, have simultaneously very high whiteness, good dielectric properties and higher heat-resisting, weather resistance, so wollastonite is widely used in the fields such as pottery, chemical industry, metallurgy, papermaking, plastics, coating.
Summary of the invention
The object of the present invention is to provide a kind of method with producing artificial wollastonite powder by utilizing Bayer red mud, the Bayer red mud that produces in the aluminum oxide production process is recycled, further solve the problem of environmental pollution that Bayer red mud causes, a kind of wollastonite powder that is widely used also is provided simultaneously.
For achieving the above object, the technical scheme that the present invention takes is: a kind of method with producing artificial wollastonite powder by utilizing Bayer red mud is characterized in that may further comprise the steps:
A: batching, it is that 0 ~ 10% dilute hydrochloric acid joins in the Bayer red mud that the soda acid molar equivalent is added concentration, neutralizes the sodium hydroxide in the Bayer red mud, adds afterwards the tensio-active agent of Bayer red mud weight 0.1 ~ 0.5%, batching is finished;
B: grind, will prepare burden is milled into 120 ~ 200 order slurries with wet-type ball mill;
C: deironing, the wet magnetic separator that is used in 6000 ~ 8000 Gauss spies' magnetism intensity carries out strong magnetic deironing to red mud slurries;
D: granulate, sending nodulizer to make particle diameter behind the raising agent of the slurry adding Bayer red mud weight 1 ~ 5% after the deironing and the carbon dust of Bayer red mud weight 10% is 2 ~ 5cm pellet to be burnt;
E: magnetizing roasting, the pellet to be burnt that will dry drop into rotary kiln magnetizing roasting 1 ~ 3 hour under the temperature of 1100 ~ 1300 degree;
F: grind again, the pellet after the magnetizing roasting is milled into powder with dry ball;
G: again deironing is the above again deironing of dry type strong magnetic separator of 12000 Gauss spies with magnetism intensity;
H: when dry ball is milled into fineness of powder less than 300 orders, or iron in the powder, when the manganese foreign matter content is higher than 0.1%, repeating step F, G until fineness more than 300 orders, and iron, manganese foreign matter content are lower than 0.1% in the powder, make finished product artificial tabular spar powder.
Described tensio-active agent is stearic acid or Phenylsulfonic acid.
With wet magnetic separator red mud slurries is carried out at least three strong magnetic final election deironing among the described step C.
Described raising agent is wood shavings or vegetable fibre.
Described finished product artificial tabular spar fineness of powder is 300 ~ 350 orders.
The chemical composition of Bayer red mud of the present invention is by weight percentage: SiO
2Be 15-34, Al
2O
3Be 6-16, Fe
2O
3Be 16-35, CaO is 10-32, and NaO is 2-8, and MgO is 12-28.
The raising agent that the present invention adopts can improve the heat exchange effect of material when calcining; Increase the reaction of intensification timeliness and material thermally equivalent; Promote two valency iron to be converted into ferric iron, and then improve the magnetic of iron.
The tensio-active agent (stearic acid or Phenylsulfonic acid) that the present invention adopts can reduce the reunion of material, increase mill, the effect of magnetic separation and calcining.
The present invention has following beneficial effect:
1, adopts method provided by the invention to administer red mud, have environment-friendly high-efficiency, the remarkable advantage that speed is fast, energy consumption is low, effective;
2, do not produce secondary residue and waste water, waste gas in the whole treating processes, thereby realize the red mud zero emissions object;
3, the artificial tabular spar that adopts the present invention to produce, physics and stable chemical performance, and be better than the characteristics of Calucium Silicate powder raw ore, can be widely used in the technical fields such as pottery, chemical industry, metallurgy, papermaking, plastics, coating, but also can be used as the function stopping composition of aviation and precise electronic.
Description of drawings
Fig. 1 is the schema that the present invention uses the method for producing artificial wollastonite powder by utilizing Bayer red mud.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in detail, but they are not limitation of the invention.
As shown in Figure 1, a kind of step of the method with producing artificial wollastonite powder by utilizing Bayer red mud is:
Batching, it is that 0 ~ 10% dilute hydrochloric acid joins in the Bayer red mud that the soda acid molar equivalent is added concentration, neutralizes the sodium hydroxide in the Bayer red mud, adds afterwards the tensio-active agent of Bayer red mud weight 0.1 ~ 0.5%, batching is finished;
Grind, will prepare burden is milled into 120 ~ 200 order slurries with wet-type ball mill;
Deironing, the wet magnetic separator that is used in 6000 ~ 8000 Gauss spies' magnetism intensity carries out strong magnetic deironing to red mud slurries; Preferably, with wet magnetic separator red mud slurries is carried out at least three strong magnetic final election deironing;
Granulate, sending nodulizer to make particle diameter behind the raising agent of the slurry adding Bayer red mud weight 1 ~ 5% after the deironing and the carbon dust of Bayer red mud weight 10% is 2 ~ 5cm pellet to be burnt;
Magnetizing roasting, the pellet to be burnt that will dry drop into rotary kiln magnetizing roasting 1 ~ 3 hour under the temperature of 1100 ~ 1300 degree;
Grind again, the pellet after the magnetizing roasting is milled into powder with dry ball;
Again deironing is the above again deironing of dry type strong magnetic separator of 12000 Gauss spies with magnetism intensity;
When dry ball is milled into fineness of powder less than 300 orders, or iron in the powder, when the manganese foreign matter content is higher than 0.1%, repeat to grind again, the step of again deironing until fineness more than 300 orders, and iron, manganese foreign matter content are lower than 0.1% in the powder, make finished product artificial tabular spar powder.
Wherein, tensio-active agent is stearic acid or Phenylsulfonic acid, and raising agent is wood shavings or vegetable fibre.
Preferably, finished product artificial tabular spar fineness of powder is 300 ~ 350 orders.
Embodiment 1
The Bayer red mud that the present embodiment adopts wherein contains weight percent and is 1 sodium hydroxide, and weight percent is 26 iron;
1, batching is got Bayer red mud, adds the stearic acid of Bayer red mud weight 0.1%, and batching is finished;
2, grind, will prepare burden is milled into 120 ~ 200 order slurries with wet-type ball mill;
3, deironing selects magnetism intensity at 6500 Gauss spies' wet magnetic separator red mud slurries to be carried out three final election deironing of strong magnetic; Iron content is in the slurry after the deironing: 8.97%;
4, granulate, the slurry after the deironing is added send nodulizer to make the pellet to be burnt that particle diameter is 2 ~ 5cm after the wood shavings of Bayer red mud weight 1% and 10% carbon dust stir;
5, magnetizing roasting.Naturally the pellet to be burnt that dries is dropped into rotary kiln magnetizing roasting 3 hours under the temperature of 1100 degree;
6, mill again, the pellet after the magnetizing roasting is milled to 100 ~ 150 orders with dry ball;
7, again deironing is 15000 Gauss spies' dry type strong magnetic separator deironing with magnetism intensity;
8, mill again, the pellet of step 7 magnetic separation is ground to 200 ~ 250 orders with dry ball again;
9, again deironing, the pellet that step 8 is ground is 15000 Gauss spies' dry type strong magnetic separator deironing again with magnetism intensity;
10, grind again, the pellet of step 9 magnetic separation is ground to 300 ~ 350 orders with dry ball again;
11, again deironing, the pellet that step 10 is ground is 15000 Gauss spies' dry type strong magnetic separator deironing with magnetism intensity again, so that iron, manganese foreign matter content are in the pellet: 0.089%, make the artificial tabular spar powder.
Embodiment 2
The Bayer red mud that the present embodiment adopts wherein contains weight percent and is 2.8 sodium hydroxide, and weight percent is 32 iron;
1, batching, it is that 10% dilute hydrochloric acid joins in the Bayer red mud that the soda acid molar equivalent is added concentration, neutralizes the sodium hydroxide in the Bayer red mud, adds afterwards the Phenylsulfonic acid of Bayer red mud weight 0.3%, batching is finished;
2, grind, will prepare burden is milled into 120 ~ 200 order slurries with wet-type ball mill;
3, deironing selects magnetism intensity at 8000 Gauss spies' wet magnetic separator red mud slurries to be carried out three final election deironing of strong magnetic; Iron content is in the slurry after the deironing: 11.2%;
4, granulate, the slurry after the deironing is added send nodulizer to make the pellet to be burnt that particle diameter is 2 ~ 5cm after the vegetable fibre of Bayer red mud weight 3% and 10% carbon dust stir;
5, magnetizing roasting.Naturally the pellet to be burnt that dries is dropped into rotary kiln magnetizing roasting 2 hours under the temperature of 1200 degree;
6, mill again, the pellet after the magnetizing roasting is milled to 100 ~ 150 orders with dry ball;
7, again deironing is 17000 Gauss spies' dry type strong magnetic separator deironing with magnetism intensity;
8, mill again, the pellet of step 7 magnetic separation is ground to 200 ~ 250 orders with dry ball again;
9, again deironing, the pellet that step 8 is ground is 17000 Gauss spies' dry type strong magnetic separator deironing again with magnetism intensity;
10, grind again, the pellet of step 9 magnetic separation is ground to 300 ~ 350 orders with dry ball again;
11, again deironing, the pellet that step 10 is ground is 17000 Gauss spies' dry type strong magnetic separator deironing with magnetism intensity again, so that iron, manganese foreign matter content are in the pellet: 0.093%, make the artificial tabular spar powder.
Embodiment 3
The Bayer red mud that the present embodiment adopts wherein contains weight percent and is 4.7 sodium hydroxide, and weight percent is 29 iron;
1, batching, it is that 10% dilute hydrochloric acid joins in the Bayer red mud that the soda acid molar equivalent is added concentration, neutralizes the sodium hydroxide in the Bayer red mud, adds afterwards the stearic acid of Bayer red mud weight 0.3%, batching is finished;
2, grind, will prepare burden is milled into 120 ~ 200 order slurries with wet-type ball mill;
3, deironing selects magnetism intensity at 7000 Gauss spies' wet magnetic separator red mud slurries to be carried out three final election deironing of strong magnetic; Iron content is in the slurry after the deironing: 8.7%;
4, granulate, the slurry after the deironing is added send nodulizer to make the pellet to be burnt that particle diameter is 2 ~ 5cm after the wood shavings of Bayer red mud weight 3% and 10% carbon dust stir;
5, magnetizing roasting.Naturally the pellet to be burnt that dries is dropped into rotary kiln magnetizing roasting 1 hour under the temperature of 1300 degree;
6, mill again, the pellet after the magnetizing roasting is milled to 100 ~ 150 orders with dry ball;
7, again deironing is 16000 Gauss spies' dry type strong magnetic separator deironing with magnetism intensity;
8, mill again, the pellet of step 7 magnetic separation is ground to 200 ~ 250 orders with dry ball again;
9, again deironing, the pellet that step 8 is ground is 16000 Gauss spies' dry type strong magnetic separator deironing again with magnetism intensity;
10, grind again, the pellet of step 9 magnetic separation is ground to 300 ~ 350 orders with dry ball again;
11, again deironing, the pellet that step 10 is ground is 16000 Gauss spies' dry high-magnetic separation dry type strong magnetic separator deironing with magnetism intensity again, so that iron, manganese foreign matter content are in the pellet: 0.096%, make the artificial tabular spar powder.
Embodiment 4
The Bayer red mud that the present embodiment adopts wherein contains weight percent and is 0.8 sodium hydroxide, and weight percent is 23 iron;
1, batching is got Bayer red mud, adds the Phenylsulfonic acid of Bayer red mud weight 0.4%, and batching is finished;
2, grind, will prepare burden is milled into 120 ~ 200 order slurries with wet-type ball mill;
3, deironing selects magnetism intensity at 6000 Gauss spies' wet magnetic separator red mud slurries to be carried out three final election deironing of strong magnetic; Iron content is in the slurry after the deironing: 7.2%;
4, granulate, the slurry after the deironing is added send nodulizer to make the pellet to be burnt that particle diameter is 2 ~ 5cm after the vegetable fibre of Bayer red mud weight 5% and 10% carbon dust stir;
5, magnetizing roasting.Naturally the pellet to be burnt that dries is dropped into rotary kiln magnetizing roasting 2 hours under the temperature of 1200 degree;
6, mill again, the pellet after the magnetizing roasting is milled to 100 ~ 150 orders with dry ball;
7, again deironing is 14000 Gauss spies' dry type strong magnetic separator deironing with magnetism intensity;
8, mill again, the pellet of step 7 magnetic separation is ground to 200 ~ 250 orders with dry ball again;
9, again deironing, the pellet that step 8 is ground is 14000 Gauss spies' dry type strong magnetic separator deironing again with magnetism intensity;
10, grind again, the pellet of step 9 magnetic separation is ground to 300 ~ 350 orders with dry ball again;
11, again deironing, the pellet that step 10 is ground is 14000 Gauss spies' dry type strong magnetic separator deironing with magnetism intensity again, so that iron, manganese foreign matter content are in the pellet: 0.081%, make the artificial tabular spar powder.
Embodiment 5
The Bayer red mud that the present embodiment adopts wherein contains weight percent and is 1.7 sodium hydroxide, and weight percent is 18 iron;
1, batching is got Bayer red mud, adds the Phenylsulfonic acid of Bayer red mud weight 0.5%, and batching is finished;
2, grind, will prepare burden is milled into 120 ~ 200 order slurries with wet-type ball mill;
3, deironing selects magnetism intensity at 6000 Gauss spies' wet magnetic separator red mud slurries to be carried out three final election deironing of strong magnetic; Iron content is in the slurry after the deironing: 6.4%;
4, granulate, the slurry after the deironing is added send nodulizer to make the pellet to be burnt that particle diameter is 2 ~ 5cm after the wood shavings of Bayer red mud weight 4% and 10% carbon dust stir;
5, magnetizing roasting.Naturally the pellet to be burnt that dries is dropped into rotary kiln magnetizing roasting 1.5 hours under the temperature of 1250 degree;
6, mill again, the pellet after the magnetizing roasting is milled to 100 ~ 150 orders with dry ball;
7, again deironing is 12000 Gauss spies' dry type strong magnetic separator deironing with magnetism intensity;
8, mill again, the pellet of step 7 magnetic separation is ground to 200 ~ 250 orders with dry ball again;
9, again deironing, the pellet that step 8 is ground is 12000 Gauss spies' dry type strong magnetic separator deironing again with magnetism intensity;
10, grind again, the pellet of step 9 magnetic separation is ground to 300 ~ 350 orders with dry ball again;
11, again deironing, the pellet that step 10 is ground is 12000 Gauss spies' dry type strong magnetic separator deironing with magnetism intensity again, so that iron, manganese foreign matter content are in the pellet: 0.083%, make the artificial tabular spar powder.
Detect by the artificial tabular spar powder that above-mentioned five embodiment are obtained, draw this artificial tabular spar powder physics and chemical parameters and be:
Fineness: 300 ~ 350 orders; Whiteness: 95;
Hardness: 4.5～5.5; Density: 2.75～3.10g/cm
3
Water absorbability: be lower than 4%; Iron level: be lower than 0.1%.
By five embodiment and obtain the physics of product and chemical parameters draws and adopts method provided by the invention, can effectively utilize Bayer red mud to produce the artificial tabular spar of high-quality, realized the comprehensive utilization of Bayer red mud.
Claims (5)
1. method with producing artificial wollastonite powder by utilizing Bayer red mud is characterized in that may further comprise the steps:
A: batching, the soda acid molar equivalent is added concentration do not join in the Bayer red mud for not being higher than 10% dilute hydrochloric acid, neutralize the sodium hydroxide in the Bayer red mud, add afterwards the tensio-active agent of Bayer red mud weight 0.1 ~ 0.5%, batching is finished;
B: grind, will prepare burden is milled into 120 ~ 200 order slurries with wet-type ball mill;
C: deironing, the wet magnetic separator that is used in 6000 ~ 8000 Gausses' magnetism intensity carries out strong magnetic deironing to red mud slurries;
D: granulate, sending nodulizer to make particle diameter behind the raising agent of the slurry adding Bayer red mud weight 1 ~ 5% after the deironing and the carbon dust of Bayer red mud weight 10% is 2 ~ 5cm pellet to be burnt;
E: magnetizing roasting, the pellet to be burnt that will dry drop into rotary kiln magnetizing roasting 1 ~ 3 hour under the temperature of 1100 ~ 1300 degree;
F: grind again, the pellet after the magnetizing roasting is milled into powder with dry ball;
G: again deironing is the above again deironing of dry type strong magnetic separator of 12000 Gausses with magnetism intensity;
H: when dry ball is milled into fineness of powder less than 300 orders, or iron in the powder, when the manganese foreign matter content is higher than 0.1%, repeating step F, G until fineness more than 300 orders, and iron, manganese foreign matter content are lower than 0.1% in the powder, make finished product artificial tabular spar powder.
2. according to the method with producing artificial wollastonite powder by utilizing Bayer red mud claimed in claim 1, it is characterized in that: described tensio-active agent is stearic acid or Phenylsulfonic acid.
3. according to the method with producing artificial wollastonite powder by utilizing Bayer red mud claimed in claim 1, it is characterized in that: with wet magnetic separator red mud slurries is carried out at least three strong magnetic final election deironing among the described step C.
4. according to the method with producing artificial wollastonite powder by utilizing Bayer red mud claimed in claim 1, it is characterized in that: described raising agent is wood shavings or vegetable fibre.
5. according to the method with producing artificial wollastonite powder by utilizing Bayer red mud claimed in claim 1, it is characterized in that: described finished product artificial tabular spar fineness of powder is 300 ~ 350 orders.
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| CN1267343C (en) * | 2004-01-17 | 2006-08-02 | 中国地质科学院郑州矿产综合利用研究所 | Method for preparing wollastonite extra white powder by using discharged waste liquid of soda production |
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