Method for producing ultra-fine calcination white bole with combination of dry and wet method

A technology of calcined kaolin and dry-wet combination, applied in the direction of non-metallic elements, etc., can solve the problems of inability to guarantee the calcined whiteness of the product, the inability to solve the calcined agglomeration of the product, poor stability and adaptability, etc., to shorten the production process and broaden the product performance , Modification cost reduction effect

Active Publication Date: 2012-04-04
内蒙古蒙西高岭粉体股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production methods of coal-based kaolin are relatively simple, mainly including "grinding first and then burning" and "burning first and then grinding". The "post-grinding" process cannot guarantee the calcined whiteness of the product. The products produced by these two processes have poor stability and adaptability, and the processing cost is relatively high.

Method used

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  • Method for producing ultra-fine calcination white bole with combination of dry and wet method
  • Method for producing ultra-fine calcination white bole with combination of dry and wet method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The coal series kaolin in Wuhai area of ​​Inner Mongolia is selected as the raw material. Grind the raw materials into 600-mesh powder. After the particles are classified, the kaolin powder above 1250 mesh is directly fed into the rotary kiln for calcination to become a product. The kaolin powder below 1250 mesh is processed in the following order:

[0026] a. Add dispersant, intercalation agent and whitening agent according to the weight ratio of kaolin powder:

[0027] Dispersant: sodium hexametaphosphate, the addition amount is 2%;

[0028] Intercalation agent: urea and ammonium acetate are mixed in a weight ratio of 5:1, and the addition amount is 2%;

[0029] Whitening agent: potassium chloride, the addition amount is 2%;

[0030] Prepare a slurry with a water content of 40%;

[0031] b. Grinding for 10 minutes;

[0032] c. The slurry is dried and scattered and sent to the rotary kiln for calcination, the calcination temperature is 950-960°C, and the calcinatio...

Embodiment 2

[0036] The coal series kaolin in Wuhai area of ​​Inner Mongolia is selected as the raw material. Grind the raw materials into 6000-mesh powder. After the particles are classified, the kaolin powder above 1250 mesh is directly sent to the rotary kiln for calcination to become a product. The kaolin powder below 1250 mesh is processed in the following order:

[0037] a. Add dispersant, intercalation agent and whitening agent according to the weight ratio of kaolin powder:

[0038] Dispersant sodium hexametaphosphate, the addition amount is 0.1%;

[0039] The intercalation agent urea and ammonium acetate are mixed in a weight ratio of 1:5, and the addition amount is 0.1%;

[0040] Whitening agent: sodium chloride, the addition amount is 0.1%;

[0041] Prepare a slurry with a water content of 60%;

[0042] b. Grinding for 150 minutes;

[0043] c. The slurry is dried and dispersed and sent to the rotary kiln for calcination, the calcination temperature is 950-960°C, and the calc...

Embodiment 3

[0047] The coal series kaolin in Wuhai area of ​​Inner Mongolia is selected as the raw material. The raw materials are ground into 2000-mesh powder, and after the particles are classified, the kaolin powder above 1250 mesh is directly sent to the rotary kiln for calcination to become a product, and the kaolin powder below 1250 mesh is processed in the following order:

[0048] a. Add according to the weight ratio of kaolin powder:

[0049] Dispersant sodium polyacrylate, the addition amount is 1%;

[0050] Prepare a slurry with a water content of 50%;

[0051] b. Grinding for 50 minutes;

[0052] c. The slurry is dried and scattered and sent to the rotary kiln for calcination, the calcination temperature is 800°C, and the calcination time is 80 minutes;

[0053] d. Put the calcined kaolin into the pulper, add water and stir to make a slurry with a water content of 40%; at the same time, add 0.8% of sodium polyacrylate as a dispersant and 2% of silane as a surface modifier; ...

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Abstract

The invention discloses a dry-wet combination method to prepare superfine calcined kaolin. After grinding by dry method, the kaolin raw ore grains are classified according to the grain size. The superfine with the grain greater than 1250 meshes can be made into a finished product by direct calcination. While for the meal with the grain less than 1250 meshes, dispersing agent, intercalation agent,and whitening agent can be added simultaneously under wet grinding, so as to improve the grinding efficiency, shorten the grinding time, and reduce the energy consumption during grinding process, as well as improve the mixing effect of the whitening agent and the kaolin. The meal scattered and dried after grinding, is sent into rotary kiln for calcinations. The kaolin is grinded again after calcination by wet grinding method. The dispersing agent and modifying agent are added simultaneously, to combine the superfine grinding and the modifying of product simultaneously. The modified powder is grinded to obtain the other finished product after drying and scattering. The invention allows superfine calcined kaolin with different specification during the same production line by the control of the process condition, thus reducing the working procedure, improving the added value of product, broadening the application field and product performance, so as to meet the requirements of different customers.

Description

Technical field: [0001] The invention relates to a production method of kaolin, in particular to a preparation method of superfine calcined kaolin. Background technique: [0002] Coal-measure kaolin is a kind of kaolin, which is mainly associated with coal, ore-forming independently, and exists in the form of ore. Coal-series kaolin is widely used in many fields such as papermaking, paint, rubber, ceramics, and catalysts after being calcined. Calcined kaolin has stable chemical properties and is an ideal filler and extender. Because coal-measure kaolin contains some organic matter and exists in the form of massive ore, the original coal-measure kaolin must be further processed before it can be used. At present, the production methods of coal-based kaolin are relatively single, mainly including "grinding first and then burning" and "burning first and then grinding". The "post-grinding" process cannot guarantee the calcined whiteness of the product. The products produced by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/20
Inventor 刘埃林叶向东冯欲晓祖吉喆高鹏军宋勇平冯利民苏咏杨海波赵鹏飞闫海军尹宏亮
Owner 内蒙古蒙西高岭粉体股份有限公司
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