Preparation method of calcined kaolin with high whiteness and ultrahigh oil absorption

A technology for calcined kaolin and oil absorption, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problems of low oil absorption and whiteness value, high oil absorption and low wear of calcined kaolin, so as to avoid repetition. The effect of sintering agglomeration, reducing the proportion, and bonding firmly

Active Publication Date: 2019-12-17
山西金宇科林科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of low oil absorption and whiteness value of calcined kaolin prepared from coal gangue, the invention discloses a method for preparing calcined kaolin with high whiteness and ultra-high oil absorption. The prepared kaolin product has good whiteness and good porosity , high oil absorption, low abrasion, can be used in thermal paper, decorative paper, high-end coatings, high-end automotive paints and other industries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing calcined kaolin with high whiteness and ultra-high oil absorption, including removing impurities from coal gangue → batching → crushing → iron removal → dry grinding → light burning in a reducing atmosphere → crushing → slurry preparation → iron removal → wet grinding → slurry preparation → Iron removal→horizontal snail classification→disk classification→filtration dehydration→slurry→iron removal→drying→pre-disintegration and depolymerization→weak reducing atmosphere calcination→rapid cooling→post-disintegration and depolymerization→product;

[0026] Wherein, the coal gangue is silicon-aluminum type coal gangue, m(Al 2 o 3 ) / m(SiO 2 )=0.8, b value=2.5 after calcination;

[0027] In order to ensure the realization of calcined whiteness, product performance and batching uniformity, the loss on ignition of raw materials after the batching: 16.2%, calorific value: 40Kcal / Kg, Fe 2 o 3 and TiO 2 Total content <1.5%;

[0028] In order to control th...

Embodiment 2

[0034] A method for preparing calcined kaolin with high whiteness and ultra-high oil absorption, including removing impurities from coal gangue → batching → crushing → iron removal → dry grinding → light burning in a reducing atmosphere → crushing → slurry preparation → iron removal → wet grinding → slurry preparation → Iron removal→horizontal snail classification→disk classification→filtration dehydration→slurry→iron removal→drying→pre-disintegration and depolymerization→weak reducing atmosphere calcination→rapid cooling→post-disintegration and depolymerization→product;

[0035] Wherein, the coal gangue is silicon-aluminum type coal gangue, m(Al 2 o 3 ) / m(SiO 2 )=0.8, b value=2.4 after calcination;

[0036] In order to ensure the realization of calcined whiteness, product performance and batching uniformity, the loss on ignition of raw materials after the batching: 16.2%, calorific value: 40Kcal / Kg, Fe 2 o 3 and TiO 2 Total content <1.5%;

[0037] In order to control th...

Embodiment 3

[0043] A method for preparing calcined kaolin with high whiteness and ultra-high oil absorption, including removing impurities from coal gangue → batching → crushing → iron removal → dry grinding → light burning in a reducing atmosphere → crushing → slurry preparation → iron removal → wet grinding → slurry preparation → Iron removal→horizontal snail classification→disk classification→filtration dehydration→slurry→iron removal→drying→pre-disintegration and depolymerization→weak reducing atmosphere calcination→rapid cooling→post-disintegration and depolymerization→product;

[0044] Wherein, the coal gangue is silicon-aluminum type coal gangue, m(Al 2 o 3 ) / m(SiO 2 )=0.8, b value=2.5 after calcination;

[0045] In order to ensure the realization of calcined whiteness, product performance and batching uniformity, the loss on ignition of raw materials after the batching: 16.2%, calorific value: 40Kcal / Kg, Fe 2 o 3 and TiO 2 Total content <1.5%;

[0046] In order to control th...

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Abstract

The invention discloses a preparation method of calcined kaolin with high whiteness and ultrahigh oil absorption. The preparation method comprises the following steps: removal of impurities in coal gangue; batching; crushing; iron removal; dry grinding; light burning in a reducing atmosphere; crushing; blending of slurry; iron removal; wet grinding; blending of slurry; iron removal; horizontal screw classification; disc classification; filter pressing and dehydration; slurry formation; iron removal; drying; pre-dispersion depolymerization; calcining in a weak reducing atmosphere; rapid cooling; post-dispersion depolymerization; and preparation of the calcined kaolin. According to the invention, a dehydroxylation section is creatively arranged behind the dry grinding section and before thewet grinding section; a light burning dehydroxylation-decarburization technology is adopted; the granularity of the material is controlled during classification and scattering, so the particle size and morphology of the material are controllable, and the microporous area and the heat exchange area of the material are increased; and in the process of calcining, the material is rapidly calcined to remove hydroxyl and realize whitening, and is then calcined and rapidly cooled without causing closing and blockage of micropores, so porosity is improved, and the calcined kaolin with high oil absorption and high whiteness is prepared.

Description

technical field [0001] The invention belongs to the technical field of chemical product production, and relates to a method for preparing kaolin, in particular to a method for preparing calcined kaolin with high whiteness and super high oil absorption capacity from coal gangue. Background technique [0002] Shanxi is a well-known large province of coal storage and coal production in my country. It not only has huge reserves of coal resources, but also has abundant mineral resources symbiotically associated with coal fields and surrounding rocks. With the development of science and technology, the application fields of kaolin are expanding day by day, especially the application in high-tech fields, making it very popular. At the same time, using coal gangue as raw material for calcined kaolin can realize effective utilization of resources and reduce environmental pollution caused by coal gangue accumulation or discharge. However, due to the crystalline form of coal-measure k...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/40
CPCC01B33/40C01P2004/61Y02P40/60
Inventor 吴尧鹏贾国兴崔子龙侯新花刘艳琴邢海明张丽红陈玉堂张岩罗一罗训樵
Owner 山西金宇科林科技有限公司
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