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Coal-series kaolin brightening method

A technology of coal-based kaolin and kaolin, which is applied in the field of increasing whiteness of ultrafine powder, and can solve the problems of limited application, low added value, and low whiteness of products

Active Publication Date: 2016-04-20
宜昌慧龙科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Kaolinite belongs to layered silicate minerals, its structural formula is: Al 4 [Si 4 o 10 ](OH) 8 , Yichang coal series kaolin has many impurities, among which the content of carbon, iron and titanium elements is high, and it contains colored mineral iron, resulting in low whiteness of the product, limited application, and low added value, and the application fields with high technological content have a great impact on the whiteness of the product. have strict requirements

Method used

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  • Coal-series kaolin brightening method
  • Coal-series kaolin brightening method

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Use coal series kaolin, hard kaolin or refractory clay as raw materials, use ultra-fine grinding equipment to grind and pulverize the proportioned minerals to less than 30 μm, of which 5 μm content is 30%, add 1.0% charcoal powder, and mix well , control its COD value at 14000ppm, put it into a calcination furnace, use a temperature of 850°C, and keep it warm for 3 hours for calcination, which can produce calcined kaolin with a whiteness of more than 88.

Embodiment 2

[0029] Use coal series kaolin, hard kaolin or refractory clay as raw materials, use ultra-fine grinding equipment to grind and pulverize the proportioned minerals to less than 30 μm, of which 5 μm content is 35%, add 0.8% charcoal powder, and mix well , control its COD value at 12000ppm, put it into a calcination furnace, use a temperature of 860°C, and keep it warm for 2 hours for calcination, which can produce calcined kaolin with a whiteness of more than 90.

Embodiment 3

[0031] Use coal series kaolin, hard kaolin or refractory clay as raw materials, use ultra-fine grinding equipment to grind and pulverize the proportioned minerals to less than 30 μm, of which 5 μm content is 38%, add 1.35% charcoal powder, and mix well , control its COD value at 14000ppm, put it into a calcination furnace, use a temperature of 830°C, and keep it warm for 4 hours for calcination, which can produce calcined kaolin with a whiteness of more than 90.

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PUM

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Abstract

The present invention provides a coal-series kaolin brightening method, in particular, charcoal powder with fineness of greater than 2000 meshes is added into coal-series kaolin powder, mixed thoroughly evenly, then calcined and thermally insulated, the calcination temperature is 800-860 DEG C, and after thermal insulation for 2-4h, the mixture is naturally cooled to room temperature to obtain whitened coal-series kaolin. The coal-series kaolin powder can also be hard kaolin or refractory clay. Production process is simple, cost is low, only the charcoal powder is used, no new impurity element is introduced in the calcining whitening process, and the product whiteness is improved greatly, and can reach 85-90 or more.

Description

technical field [0001] The invention relates to a method for increasing the whiteness of superfine powder of coal series kaolin, hard kaolin or refractory clay. technical background [0002] Kaolin is a clay whose main component is kaolinite. Kaolinite belongs to layered silicate minerals, its structural formula is: Al 4 [Si 4 o 10 ](OH) 8 , Yichang coal series kaolin has many impurities, among which the content of carbon, iron and titanium elements is high, and it contains colored mineral iron, resulting in low whiteness of the product, limited application, and low added value, and the application fields with high technological content have a great impact on the whiteness of the product. There are strict requirements. Therefore, calcination is required for whitening. Contents of the invention [0003] Because Yichang coal-measure kaolin is associated with coal, the crystal structure gap contains a large amount of carbon, organic matter and iron. In the case of ordin...

Claims

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Application Information

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IPC IPC(8): C01B33/40
Inventor 樊艳明
Owner 宜昌慧龙科技开发有限公司