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Method for preparing activated kaolin by washing kaolin with water

A technology of activated kaolin and water-washed kaolin, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc.

Active Publication Date: 2014-09-17
北海高岭科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few reports on the production technology and industrialization implementation of activated kaolin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) the solid content is that the pH value of 57% kaolin raw ore pulp is adjusted to 6.0 and adds sodium hexametaphosphate and sodium polyacrylate dispersant, the weight of kaolin in the described sodium hexametaphosphate and sodium polyacrylate and the kaolin raw ore pulp The percentage is divided into 5‰ and 2‰, and the slurry is stirred. After stirring the pulp, grind the pulp in an ultra-fine grinder, peel off the flakes, and further press filter and dehydrate to a solid content of 65% to obtain a kaolin filter cake. Wherein, the content of kaolin particles with a particle size of less than two microns in the kaolin raw ore slurry accounts for 95 wt% of the kaolin particles in the kaolin raw ore slurry.

[0028] Among them, after the pulp passes through the 75mm and 25mm cyclones, the overflow pulp of the cyclone is then centrifugally classified by the decanter classifier, and the kaolin particle size can be controlled to less than 2 microns and the content is more t...

Embodiment 2

[0033]1) the solid content is that the pH value of 57% kaolin raw ore pulp is adjusted to 6.0 and adds sodium hexametaphosphate and sodium polyacrylate dispersant, the weight of kaolin in the described sodium hexametaphosphate and sodium polyacrylate and the kaolin raw ore pulp The percentage is divided into 5‰ and 2‰, and the slurry is stirred. After the pulp is stirred, the pulp is ground and flaked in an ultra-fine grinder, and further press-filtered and dehydrated to a solid content of 65%, to obtain a kaolin filter cake, wherein the kaolin particles in the kaolin raw ore pulp have a particle size of less than two microns The content accounts for 95wt% of the kaolin particles in the kaolin raw ore slurry.

[0034] Among them, after the pulp passes through the 75mm and 25mm cyclones, the overflow pulp of the cyclone is then centrifugally classified by the decanter classifier, and the kaolin particle size can be controlled to less than 2 microns and the content is more than ...

Embodiment 3

[0039] 1) The selected kaolin slurry with a solid content of 12% after sand removal is classified by a hydrocyclone and a decanter, so that the content of the kaolin slurry below 2 microns reaches more than 85%; The content is concentrated to 25%; the concentrated pulp is press-filtered to a filter cake with a solid content of 65%.

[0040] Among them, after the pulp passes through the 75mm and 25mm cyclone, the cyclone overflows, and the pulp is then centrifugally classified by the decanter classifier, and the kaolin particle size can be controlled to less than 2 microns and the content is more than 85%.

[0041] 2) The kaolin filter cake obtained in the step 1) is flashed and dried under a slight negative pressure condition of -150pa to obtain a kaolin dry powder with a moisture content below 1.5%.

[0042] 3) Calcining the dry kaolin powder obtained in step 2) with biological particles as the combustion medium at a calcination temperature of 750° C. and a calcination time o...

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Abstract

The invention belongs to the technical field of the production process of activated kaolin and in particular relates to a method for preparing activated kaolin by washing kaolin with water. The method comprises the steps of preparing a kaolin filter cake, preparing kaolin dry powder, thermally activating kaolin, and preparing activated kaolin by performing depolymerization and modification on the thermally activated kaolin. Deep treatment is performed on kaolin resources by use of processes such as appropriate-temperature calcination, efficient depolymerization and dispersion and modification on the basis of the traditional treatment process of washing the kaolin with water, therefore, the activated kaolin having the characteristics of volcanic ash can be prepared; the activated kaolin can be applied to the fields such as a high-grade concrete additive, a cable filler, a water-based coating and the like, and has the characteristics of short setting time, high early strength, shrinkage compensation, no corrosion to reinforcements, high resistivity and the like; as a result, the valued added of the kaolin resources can be increased, and the activated kaolin has enormous market space potential.

Description

technical field [0001] The invention belongs to the technical field of production technology of activated kaolin, and in particular relates to a process for preparing activated kaolin by washing kaolin with water. Background technique [0002] my country is a country rich in kaolin resources, especially in Maoming, Guangdong, which is rich in kaolin resources, but the efficient utilization of kaolin resources and the development of new materials still need to be strengthened. At present, the use of water-washed kaolin is mainly concentrated in papermaking, paint filler and ceramic production raw materials. In recent years, due to the successful use of heavy and light calcium carbonate in paper production and its superior performance, it has brought great challenges to the application of kaolin in the paper industry; on the other hand, kaolin has great application potential in the field of construction engineering. [0003] In recent years, the research and application of ac...

Claims

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Application Information

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IPC IPC(8): C01B33/40
Inventor 曾伟能水中和周汉文王桂明杨增良梅明军
Owner 北海高岭科技有限公司
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