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Method for producing calcined kaolin with high covering power

A technology of calcined kaolin and production methods, applied in the direction of aluminum silicate, silicate, etc., can solve the problems of limiting the amount of water-based coatings added, low hiding power, etc., and achieve improved storage stability, high oil absorption, and concentrated particle size distribution Effect

Active Publication Date: 2015-04-29
山西金宇科林科技有限公司
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AI Technical Summary

Problems solved by technology

Kaolin has a long history of application in the paint industry, but due to its low hiding power and other factors, its addition in water-based paints is limited

Method used

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Embodiment Construction

[0016] The present invention will be described in further detail below by way of examples.

[0017] A method for producing calcined kaolin with high hiding power, carried out according to the following steps:

[0018] After the massive coal gangue or kaolinite is manually selected, the loss on ignition of the raw ore is controlled at 16.5%±0.25%, and the Al 2 o 3 Content 35.0%-39.0%, SiO 2 The content is 42.0%-46.0%; it is crushed into a material with a particle size of ≤30mm; it is pulverized by a mill until it passes through 325 mesh and the rate is 90%; a dispersant with a raw material weight of ≤0.5% is added during the pulping process, and the dispersant It is one or more of sodium hexametaphosphate, sodium polyacrylate, and ammonium polyacrylate; the material after wet grinding is classified by decanter centrifuge to remove large particles that have not been fully ground, increase the particle size of the mud, and overflow after classification Mud 325 mesh sieve resid...

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PUM

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Abstract

The invention discloses a method for producing calcined kaolin with high covering power and belongs to the technical field of calcined kaolin. The invention provides a method for producing calcined kaolin which is high in whiteness, superfine in grain size and centralized in particle size distribution and has the advantages of high oil absorption amount and high covering power. The method for producing calcined kaolin with high covering power provided by the invention comprises the following steps: performing dosing, coarse crushing, milling, pulping, horizontal screwing, disc treatment, filter pressing and spray drying on coal gangue or kaolinite rock, crushing and reducing the aggregated spray, calcining for performing decarbonizing and whitening, crystal water removal and forming a gap structure, and finally, aggregating the depolymerized and calcined materials, thereby obtaining the finished product. The method disclosed by the invention is mainly applied to the aspect of kaolin.

Description

technical field [0001] The invention discloses a method for producing calcined kaolin with high hiding power, belonging to the technical field of calcined kaolin. Background technique [0002] Titanium dioxide, a white pigment commonly used in the paint industry, has a high price, and it will cause relatively large chemical pollution to the environment during production and processing. Usually, natural mineral kaolin with stable chemical properties is used instead of white pigments such as titanium dioxide, which can reduce costs. Kaolin has a long history of application in the paint industry, but due to its low hiding power and other factors, its addition in water-based paints is limited. Therefore, it is necessary to improve it. Contents of the invention [0003] In order to overcome the deficiencies in the prior art, a method for producing calcined kaolin with high whiteness, ultra-fine particle size, concentrated particle size distribution, high oil absorption and hi...

Claims

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Application Information

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IPC IPC(8): C01B33/26
Inventor 陈虎啸吴尧鹏侯新花郭强
Owner 山西金宇科林科技有限公司
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