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A kind of preparation method of high whiteness and super oil absorption calcined kaolin

A technology of calcined kaolin and oil absorption, which is applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problems of high oil absorption, low wear, low oil absorption and whiteness value of calcined kaolin, and achieve reduction ratio, The effect of increasing ultra-high voids and specific surface area and avoiding repeated sintering and agglomeration

Active Publication Date: 2022-07-08
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 preparation method of calcined kaolin with high whiteness and ultra-high oil absorption, comprising the steps of removing impurities from coal gangue → batching → crushing → iron removal → dry grinding → light burning in reducing atmosphere → pulverization → slurry preparation → iron removal → wet grinding → slurry preparation → Iron removal→decanter classification→disc classification→filter press dehydration→slurrying→iron removal→drying→pre-dispersion and depolymerization→weak reducing atmosphere calcination→quick cooling→post-dispersion and depolymerization→product;

[0026] Wherein, the coal gangue is silica-alumina coal gangue, m(Al 2 O 3 ) / m(SiO 2 )=0.8, b value after calcination=2.5;

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

[0028] In ord...

Embodiment 2

[0034] A preparation method of calcined kaolin with high whiteness and ultra-high oil absorption, comprising the steps of removing impurities from coal gangue → batching → crushing → iron removal → dry grinding → light burning in reducing atmosphere → pulverization → slurry preparation → iron removal → wet grinding → slurry preparation → Iron removal→decanter classification→disc classification→filter press dehydration→slurrying→iron removal→drying→pre-dispersion and depolymerization→weak reducing atmosphere calcination→quick cooling→post-dispersion and depolymerization→product;

[0035] Wherein, the coal gangue is silica-alumina coal gangue, m(Al 2 O 3 ) / m(SiO 2 )=0.8, b value after calcination=2.4;

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

[0037] In ord...

Embodiment 3

[0043] A preparation method of calcined kaolin with high whiteness and ultra-high oil absorption, comprising the steps of removing impurities from coal gangue → batching → crushing → iron removal → dry grinding → light burning in reducing atmosphere → pulverization → slurry preparation → iron removal → wet grinding → slurry preparation → Iron removal→decanter classification→disc classification→filter press dehydration→slurrying→iron removal→drying→pre-dispersion and depolymerization→weak reducing atmosphere calcination→quick cooling→post-dispersion and depolymerization→product;

[0044] Wherein, the coal gangue is silica-alumina coal gangue, m(Al 2 O 3 ) / m(SiO 2 )=0.8, b value after calcination=2.5;

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

[0046] In ord...

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Abstract

The invention discloses a preparation method of calcined kaolin with high whiteness and ultra-high oil absorption. → Slurry preparation → iron removal → decanter classification → disc classification → filter press dehydration → pulping → iron removal → drying → pre-dispersion and depolymerization → calcination in weak reducing atmosphere → rapid cooling → post-dispersion and depolymerization → product. In the present invention, the dehydroxylation section is creatively arranged after the dry grinding section and before the wet grinding section, and the light-burning dehydroxylation-decarburization technology is adopted, and the particle size of the material is controlled in the classification and dispersing, so that it not only reaches the particle size and The morphology is controllable, and the material is microporous and the heat exchange area is increased. During the calcination process, it is rapidly calcined, dehydroxylated and whitened, and then rapidly cooled after calcination without causing the closure and blockage of the micropores. Porosity, preparation of high oil absorption and high whiteness calcined kaolin.

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 ultra-high oil absorption by using coal gangue. Background technique [0002] Shanxi is a famous coal-storage and coal-producing province 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 field of kaolin is expanding day by day, especially in the field of high and new technology, which makes it very popular. At the same time, using coal gangue as the raw material for calcining kaolin can realize the effective utilization of resources and reduce the pollution of coal gangue accumulation or discharge to the environment. However, due to the crystalline form and high carbon co...

Claims

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Application Information

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Patent Type & Authority Patents(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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