CN116478561A - Method for improving whiteness of black talcum powder and product thereof - Google Patents
Method for improving whiteness of black talcum powder and product thereof Download PDFInfo
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- CN116478561A CN116478561A CN202310446273.8A CN202310446273A CN116478561A CN 116478561 A CN116478561 A CN 116478561A CN 202310446273 A CN202310446273 A CN 202310446273A CN 116478561 A CN116478561 A CN 116478561A
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- black
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- talcum powder
- whiteness
- talc
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- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 40
- 229910052623 talc Inorganic materials 0.000 claims abstract description 82
- 239000000454 talc Substances 0.000 claims abstract description 82
- 235000012222 talc Nutrition 0.000 claims abstract description 82
- 239000002002 slurry Substances 0.000 claims abstract description 59
- 238000000227 grinding Methods 0.000 claims abstract description 22
- 239000007800 oxidant agent Substances 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 17
- 230000001590 oxidative effect Effects 0.000 claims abstract description 12
- 239000007787 solid Substances 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 238000005406 washing Methods 0.000 claims abstract description 9
- 238000001914 filtration Methods 0.000 claims abstract description 8
- 230000001105 regulatory effect Effects 0.000 claims abstract description 7
- 239000008394 flocculating agent Substances 0.000 claims abstract description 5
- 238000000498 ball milling Methods 0.000 claims description 10
- 239000000919 ceramic Substances 0.000 claims description 10
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 9
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 7
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 6
- 239000011324 bead Substances 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 4
- 238000011049 filling Methods 0.000 claims description 4
- 229920002401 polyacrylamide Polymers 0.000 claims description 4
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 31
- 229910052799 carbon Inorganic materials 0.000 abstract description 31
- 230000002087 whitening effect Effects 0.000 abstract description 14
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000009776 industrial production Methods 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 14
- 239000007788 liquid Substances 0.000 description 10
- 229910052500 inorganic mineral Inorganic materials 0.000 description 8
- 239000011707 mineral Substances 0.000 description 8
- 238000007254 oxidation reaction Methods 0.000 description 8
- 239000000843 powder Substances 0.000 description 6
- 238000001354 calcination Methods 0.000 description 5
- 239000003973 paint Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000010453 quartz Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 238000005262 decarbonization Methods 0.000 description 3
- 239000010459 dolomite Substances 0.000 description 3
- 229910000514 dolomite Inorganic materials 0.000 description 3
- 229910052634 enstatite Inorganic materials 0.000 description 3
- 238000005189 flocculation Methods 0.000 description 3
- 230000016615 flocculation Effects 0.000 description 3
- BBCCCLINBSELLX-UHFFFAOYSA-N magnesium;dihydroxy(oxo)silane Chemical compound [Mg+2].O[Si](O)=O BBCCCLINBSELLX-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000005060 rubber Substances 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 239000005995 Aluminium silicate Substances 0.000 description 2
- 235000012211 aluminium silicate Nutrition 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000004594 Masterbatch (MB) Substances 0.000 description 1
- 241000276425 Xiphophorus maculatus Species 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000001238 wet grinding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/28—Compounds of silicon
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/05—Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/006—Combinations of treatments provided for in groups C09C3/04 - C09C3/12
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/04—Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/04—Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
- C09C3/041—Grinding
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/06—Treatment with inorganic compounds
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
Abstract
The invention provides a method for improving whiteness of black talcum powder and a product thereof, and relates to the technical field of nonmetallic ore processing. The method specifically comprises the following steps: 1) Carrying out wet superfine grinding on the black talcum powder to obtain slurry; 2) Regulating the solid content of the slurry obtained in the step 1), adding a flocculating agent, stirring, and standing for layering; 3) Taking out the upper-layer slurry in the layered slurry in the step 2), adding an oxidant into the upper-layer slurry, and standing; 4) And (3) filtering, washing and drying the talcum powder slurry treated in the step (3) to obtain the whitened black talcum powder. According to the scheme, most of carbon in the black talcum is separated from the talcum by utilizing a superfine grinding method, the flocculating agent is utilized to flocculate carbon particles, unflocted talcum can be suspended at the upper middle part of the slurry, and finally the upper middle part of the slurry is treated by utilizing an oxidant to obtain the high-whiteness talcum. The integral whitening method is simple and efficient, has low energy consumption, is safe and environment-friendly, and is particularly suitable for large-scale industrial production.
Description
Technical Field
The invention belongs to the technical field of nonmetallic ore processing, and particularly relates to a method for improving whiteness of black talcum powder and a product thereof.
Background
Talc is widely used in the fields of ceramics, chemical industry, metallurgy, paper making, plastics, paint, medicine, cosmetic material, engraving material and the like based on the special physical and chemical properties and the special lamellar structure. The crystal structure of talc allows it to be processed into fine flaky particles, which have a large specific surface area and good dispersibility, and which have non-thermal conductivity and good electrical insulation properties, and talc porcelain made of high-quality talc is a high-grade insulating product. The platy talcum with high aspect ratio has good adsorptivity and covering capability, and is suitable for being used as a raw material of paint by combining with excellent chemical stability of talcum, so that the fire resistance and the weather resistance of the paint are improved.
Whiteness is an important technical index affecting the application field of talcum powder. White talcum powder can be widely used for producing rubber, plastics, paint, putty and other products. Moreover, white talc is necessary if white or colored products are desired.
Black talc is a generic term for black, gray black talc, and carbon inclusion is the main cause of blackening. The main minerals in black talc are talc, as well as some quartz and carbon. The black talc resources in China are quite rich, but the black talc cannot be widely applied due to low whiteness, and can only be applied to ceramics, rubber and other industries. From this, the whiteness problem of the black talc is one of the bottleneck problems restricting the development of the black talc industry.
It is counted that Guangfeng is the "all of black talc" with the largest global reserves and highest grade so far. The content of the Guangfeng black talcum silicon and magnesium can reach about 60 percent and 30 percent respectively, and the Guangfeng black talcum powder is rare high-grade black talcum ore at home and abroad. The whiteness of the Guangfeng black talcum can reach 96.5 percent after reasonable grinding and proper temperature calcination. The calcined enstatite has stable property, provides a road for the application of black talcum, is a superior master batch for manufacturing high-grade daily ceramics, building ceramics, process ceramics and industrial ceramics by replacing kaolin, and has high cost performance for the kaolin. However, the calcining method in the prior art requires higher energy consumption, and talcum is no longer needed after calcining, so that the generated enstatite can only be applied to the ceramic field, and the application field of the black talcum after whitening is limited.
Therefore, the method for whitening the black talcum with low energy consumption, no change of the talcum crystal structure and high whiteness of the product is provided, so that the product can be widely applied to various talcum application fields, and the technical problem to be solved by the person skilled in the art is urgent.
Disclosure of Invention
The invention aims to provide a method for improving whiteness of black talcum powder, which solves the problem of lower whiteness caused by higher carbon content in Jiangxi Guangfeng black talcum in the prior art. According to the scheme, most of carbon particles in the black talcum are peeled off from talcum particles by utilizing a superfine grinding method; then, the flocculant is utilized for selective flocculation treatment, and after the flocculant is added, carbon particles can sink into the bottom of the slurry, unflocculated talcum can suspend in the middle upper part of the slurry, and the carbon content in the middle upper part slurry is lower than 1%; and then the middle and upper sizing agent is treated by using an oxidant to obtain the talcum with high whiteness. The integral whitening method is simple and efficient, has low energy consumption, is safe and environment-friendly, and is particularly suitable for large-scale industrial production.
In order to achieve the above purpose, the present invention provides a method for improving whiteness of black talcum powder, comprising the following steps:
1) Carrying out wet superfine grinding on the black talcum powder to obtain slurry;
2) Regulating the solid content of the slurry obtained in the step 1), adding a flocculating agent, stirring, and standing for layering;
3) Taking out the upper-layer slurry in the layered slurry in the step 2), adding an oxidant into the upper-layer slurry, and standing;
4) And (3) filtering, washing and drying the talcum powder slurry treated in the step (3) to obtain the whitened black talcum powder.
In a preferred embodiment, in step 1), the chemical components and the content of the black talc powder are: talc more than 85%, total content of dolomite and quartz stone less than 10%, and carbon 1-5%.
In a preferred embodiment, in step 1), the wet ultra-fine grinding method is: by black slideStone powder is used as a raw material, ball milling is carried out by adding a proper amount of water into a ball milling medium, the ball milling medium comprises one of zirconia ceramic beads, diamond or alumina ceramic beads, and the size of the ball milling medium is as followsThe filling rate of the grinding medium in the grinding cavity is 65-80%
In a preferred embodiment, in step 1), the wet ultrafine milled slurry has a particle size of: 800-4000 mesh.
In a preferred embodiment, in step 2), the slurry has a solids content of 5 to 30% after conditioning.
In a preferred embodiment, in step 2), the flocculant is one or more of polyaluminum chloride, polyaluminum chloride or polyacrylamide.
In a preferred embodiment, in step 2), the mass ratio of flocculant to black talc is (0.1-1.0): 100.
in a preferred embodiment, in step 3), the oxidizing agent is one or more of sodium hypochlorite, hydrogen peroxide and ozone.
In a preferred embodiment, in step 3), the mass ratio of the oxidizing agent to the black talc is (1-15): 100.
it is a further object of the present invention to provide a white high talc product prepared by any of the above methods.
Compared with the prior art, the technical scheme of the invention has the following advantages:
1. in the invention, carbon impurities in the black talc are effectively removed by superfine grinding, flocculation sedimentation and oxidation. The process is energy-saving, environment-friendly, safe and efficient, can continuously produce a large amount of talcum products with high whiteness and low cost without a high-temperature calcination method in the traditional process, and has remarkable progress of cost reduction and synergy.
2. The method does not adopt the traditional calcination process, so that the talcum mineral structure is not changed into enstatite. Therefore, the application field of the black talc whitening product can be effectively expanded, and the black talc whitening product can be widely used for preparing materials such as plastics, rubber, paint and the like.
3. The method can fully utilize the black talc ore produced in Guangfeng area of Shangrou city in Jiangxi province in a recycling way. After one ton of raw black talcum ore is purified and whitened in the scheme of the invention, 700-800 kg of white talcum powder with whiteness of 86% and 200-300 kg of carbon-rich mineral powder can be produced. The carbon-rich mineral powder can be further processed or sold as a byproduct because of the enrichment of carbon elements, so that the resource utilization way of the black talc ore is enlarged, and the economic benefit is improved.
Detailed Description
In order that those skilled in the art will better understand the present invention, the following description will provide further details in connection with specific embodiments, but it should be understood that the scope of the invention is not limited by the specific embodiments.
The embodiment of the invention solves the technical problems of high calcining and whitening energy consumption and high cost of the black talcum in the prior art by providing the method for improving the whiteness of the black talcum powder and the product thereof.
The following describes the technical scheme of the present application in detail through specific embodiments:
the invention provides a method for improving whiteness of black talcum powder, which specifically comprises the following steps:
1) Carrying out wet superfine grinding on the black talcum powder to obtain slurry;
2) Regulating the solid content of the slurry obtained in the step 1), adding a flocculating agent, stirring, and standing for layering;
3) Taking out the upper-layer slurry in the layered slurry in the step 2), adding an oxidant into the upper-layer slurry, and standing;
4) And (3) filtering, washing and drying the talcum powder slurry treated in the step (3) to obtain the whitened black talcum powder.
In a preferred embodiment, in step 1), the chemical components and the content of the black talc powder are: talc more than 85%, total content of dolomite and quartz stone less than 10%, and carbon 1-5%.
In a preferred embodiment, in step 1), the wet superfine grinding method is as follows: using black talcum powder as raw material and ball milling mediumBall milling is carried out by adding a proper amount of water, the ball milling medium comprises one of zirconia ceramic beads, diamond or alumina ceramic beads, and the size of the ball milling medium is thatThe filling rate of the grinding medium in the grinding cavity is 65-80%; more preferably, the grinding medium has a size +.>The filling rate is 70-80%.
In a preferred embodiment, in step 1), the wet ultrafine milled slurry has a particle size of: preferably, the particle size of the wet superfine ground slurry is 800-4000 meshes: 1250-4000 mesh. In the invention, by controlling the parameters of the wet grinding method, slurry with superfine particle size is obtained, so that most of carbon in the black talcum is separated from the talcum and is convenient for subsequent removal.
In a preferred embodiment, in step 2), the solids content of the slurry after adjustment with water is 5-30%, preferably the solids content of the slurry after adjustment is 10-15%.
In a preferred embodiment, in step 2), the flocculant is one or more of polyaluminum chloride, polyaluminum chloride or polyacrylamide.
In a preferred embodiment, in step 2), the mass ratio of flocculant to black talc is (0.1-1.0): 100, preferably, the mass ratio of the flocculant to the black talc is (0.3-0.6): 100.
the flocculant selected by the invention is low in price and easy to purchase, and the effect of flocculating carbon elements can be achieved with less consumption. In terms of the amount of the flocculant, if more than the aforementioned range is used, resource waste is caused, and too much flocculant lowers the yield of the high-whiteness talc.
In a preferred embodiment, in step 2), the stirring conditions are: stirring at 100-2000rpm for 5-40min, preferably 300-1200rpm; the standing time is 10-20min.
In the invention, flocculant is added into the black talcum slurry with superfine particle size, and then the mixture is fully stirred, so that free carbon particles in the black talcum are flocculated, after standing, the carbon particles sink into the bottom of the slurry, and unflocted lighter talcum is suspended in the upper middle part of the slurry, so that the black talcum and the unflocted lighter talcum are primarily separated.
In a preferred embodiment, in step 2), the layered middle-lower layer slurry is collected, filtered, washed and dried to obtain a carbon-rich mineral powder, and the carbon content in the carbon-rich mineral powder is detected to be about 20%, so that the carbon-rich mineral powder can be further processed or sold as a carbon raw material.
In a preferred embodiment, in step 3), the oxidizing agent is one or more of sodium hypochlorite, hydrogen peroxide and ozone, wherein the ozone comprises one of gaseous ozone or liquid ozone.
In a preferred embodiment, in step 3), the mass ratio of the oxidizing agent to the black talc is (1-15): 100.
in the invention, the oxidant is added into the black talcum particles after preliminary separation, so that the carbon content in talcum can be further reduced, and the reaction product generated by the selected oxidant is colorless and has obvious whitening and carbon removing effects. In addition, after flocculation separation treatment, the carbon content in the upper liquid is less than 1%, and carbon element can be oxidized by using a small amount of oxidant, so that the reagent consumption can be saved, and the production cost can be reduced.
In a preferred embodiment, in step 3), the oxidizing agent is liquid ozone water, and the mass ratio of liquid ozone water to black talc is (3-8): 100.
in a preferred embodiment, in step 3), the oxidation reaction time is from 4 to 200 hours.
In a preferred embodiment, in step 4), the filtration, washing and drying may be carried out in a conventional manner known to those skilled in the art, provided that the purpose of the operation is achieved. Preferably, the washing is carried out by adopting deionized water to wash for 2-4 times so as to remove the surface oxidant, and the drying mode is 60-150 ℃, and the drying is carried out for 2-4 hours.
It is a further object of the present invention to provide a white high talc product prepared by any of the above methods.
Unless otherwise indicated, the technical means used in the present invention are conventional means well known to those skilled in the art, and various raw materials, reagents, instruments, equipment, etc. used in the present invention are commercially available or can be prepared by existing methods. The reagents used in the invention are analytically pure unless otherwise specified.
The production area of the black talcum used in the embodiment of the invention is Guangfeng region of Shangrou city of Jiangxi province, wherein the talcum is more than 85%, the total content of dolomite and quartz stone is less than 10%, the carbon is 1-5%, and the whiteness is 6.78%.
The whiteness test method provided by the embodiment of the invention is a whiteness measurement method for building materials and nonmetallic mineral products (GB/T5950-2008).
Example 1
A method of whitening black talc comprising the steps of:
1. carrying out wet superfine grinding on the black talcum powder to 1000 meshes to obtain slurry;
2. regulating the solid content of the slurry in the step 1) to 5%, adding a polyaluminium chloride flocculant accounting for 0.1% of the mass of the black talcum powder, stirring for 10min, standing to flocculate carbon particles in the black talcum powder, and sinking into the bottom of the slurry;
3. taking out the upper layer liquid of the slurry separated from the upper layer and the lower layer in the step 2), and adding sodium hypochlorite oxidant accounting for 3% of the mass of the black talcum powder into the upper layer liquid for oxidization and decarbonization treatment for 24 hours;
4. and (3) taking out the slurry subjected to the oxidation in the step (3), and filtering, washing and drying the slurry to obtain the whitened talcum powder.
The whiteness of the black talc after whitening in this example was tested to be 86%.
Example 2
A method of whitening black talc comprising the steps of:
1. carrying out wet superfine grinding on the black talcum powder to 4000 meshes to obtain slurry;
2. regulating the solid content of the slurry in the step 1) to 30%, adding a polyacrylamide flocculant with the mass of 1.0% of that of the black talcum powder, stirring for 30min, standing to flocculate carbon particles in the black talcum powder, and sinking into the bottom of the slurry;
3. taking out the upper layer liquid of the slurry separated from the upper layer and the lower layer in the step 2), and adding an ozone water oxidant with the mass of 15% of that of the black talcum powder into the upper layer liquid to perform oxidization decarbonization treatment for 150h;
4. and (3) taking out the slurry subjected to the oxidation in the step (3), and filtering, washing and drying the slurry to obtain the whitened talcum powder.
The whiteness of the black talc after whitening in this example was tested to be 91%.
Example 3
A method of whitening black talc comprising the steps of:
1. carrying out wet superfine grinding on the black talcum powder to 2500 meshes to obtain slurry;
2. regulating the solid content of the slurry in the step 1) to 10%, adding a polymeric ferric chloride flocculant accounting for 0.5% of the mass of the black talcum powder, stirring for 20min, standing to flocculate carbon particles in the black talcum powder, and sinking into the bottom of the slurry;
3. taking out the upper layer liquid of the sizing agent which is separated from the upper layer and the lower layer in the step 2), and adding hydrogen peroxide with the mass of 5% of that of the black talcum powder into the upper layer liquid to perform oxidization decarbonization treatment for 130h;
4. and (3) taking out the slurry subjected to the oxidation in the step (3), and filtering, washing and drying the slurry to obtain the whitened talcum powder.
The whiteness of the black talc after whitening in this example was tested to be 89%.
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (9)
1. A method for improving whiteness of black talcum powder, which is characterized by comprising the following steps:
1) Carrying out wet superfine grinding on the black talcum powder to obtain slurry;
2) Regulating the solid content of the slurry obtained in the step 1), adding a flocculating agent, stirring, and standing for layering;
3) Taking out the upper-layer slurry in the layered slurry in the step 2), adding an oxidant into the upper-layer slurry, and standing;
4) And (3) filtering, washing and drying the talcum powder slurry treated in the step (3) to obtain the whitened black talcum powder.
2. The method for improving whiteness of black talc according to claim 1, wherein in step 1), said wet ultra-fine grinding method is: using black talcum powder as raw material, ball-milling with ball-milling medium containing one of zirconia ceramic beads, diamond or alumina ceramic beads and proper amount of water, wherein the size of the ball-milling medium isThe filling rate of the grinding medium in the grinding cavity is 65-80%.
3. The method for improving whiteness of black talc according to claim 1, wherein in step 1), the wet superfine grinding slurry has a particle size of: 800-4000 mesh.
4. A method for improving the whiteness of talc according to claim 1, wherein in step 2), the solid content of said slurry after adjustment is 5 to 30%.
5. A method of increasing the whiteness of talc according to claim 1, wherein in step 2), said flocculant is one or more of polyaluminum chloride, polyaluminum chloride or polyacrylamide.
6. A method for improving the whiteness of black talc according to claim 1, wherein in step 2), the mass ratio of said flocculant to black talc is (0.1 to 1.0): 100.
7. the method for improving whiteness of black talc according to claim 1, wherein in step 3), said oxidizing agent is one or more of sodium hypochlorite, hydrogen peroxide and ozone.
8. A method for improving whiteness of black talc according to claim 1, wherein in step 3), the mass ratio of said oxidizing agent to black talc is (1 to 15): 100.
9. a white high talc product prepared as defined in any one of claims 1 to 8 as black talc.
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