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State division of superfine kaolin

A technology of ultra-fine kaolin and classification method, applied in the field of classification of ultra-fine kaolin, can solve problems such as inability to meet, and achieve the effect of improving the classification effect

Inactive Publication Date: 2010-10-20
MAOMING PETROCHEM MINING IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the horizontal screw machine classification used in domestic kaolin production can only increase the mass percentage content of kaolin-2μm to 88%-92%, which cannot meet the high-grade paper-making coating kaolin-2μm mass percentage content of 96%-99%. Require

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] (1) The kaolin ore is mined by hydromechanical method, and the quality of -2μm is obtained by removing impurities through a φ2400mm high weir type spiral classifier and a three-stage hydrocyclone (the first stage φ250mm, the second stage φ150mm, and the third stage φ75mm). The percentage content is 70% kaolin slurry.

[0014] (2) Concentrate the pulp to a mass percentage concentration of 16-18%, then add caustic soda to adjust the pH value of the pulp to 6.0-6.5, and then add sodium hexametaphosphate to adjust the pulp viscosity to 40-50mPa·s.

[0015] (3), with 15 ~ 20m 3 The amount of slurry fed per hour enters the Haishen decanter machine for classification. The drum speed of the decanter machine is 2800-2900r / min, and the differential speed is 35-40r / min. The overflow of the decanter machine is taken to obtain the mass percentage content of -2μm It is 99.8% kaolin slurry.

Embodiment 2

[0017] (1) The kaolin ore is mined by hydromechanical method, and the quality of -2μm is obtained by removing impurities through a φ2400mm high weir type spiral classifier and a three-stage hydrocyclone (the first stage φ250mm, the second stage φ150mm, and the third stage φ75mm). The percentage content is 75% kaolin slurry.

[0018] (2) Concentrate the pulp to a mass percentage concentration of 18-20%, then add caustic soda to adjust the pH value of the pulp to 6.0-6.5, and add sodium hexametaphosphate to adjust the pulp viscosity to 50-60mPa·s.

[0019] (3), with 40 ~ 50m 3 The amount of slurry fed per hour enters the Andritz decanter for classification. The drum speed of the decanter is 2800-2900r / min, and the differential speed is 35-40r / min. The overflow of the decanter is taken to obtain a mass of -2μm. Kaolin slurry with a percentage content of 98.0%.

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Abstract

The invention relates to a state division of superfine kaolin, which comprises the following steps: (1) exploiting a kaolin mine with a hydro- mechanical method, removing the impurities through a two-stage spiral classifier and a three-stage hydrocyclone to obtain kaolin pulp with mass percentage of 65-78 percent and with the grain diameter of -2microns; (2) dehydrating and concentrating the pulp obtained in the step (1) to have the mass percentage concentration of 12-35 percent, adding caustic soda, adjusting pH value to 4.5-7.5, and adding a dispersing agent to adjust the viscosity of the kaolin to be less than 100 mPa.s; (3) classifying the pulp obtained in the step (2) with a horizontal screw centrifuge to obtain the horizontal screw centrifuge overflow kaolin pulp with mass percentage of 93-99.9 percent and with the grain diameter of -2microns. In the invention, the classifying effect is improved through controlling the pH value, the viscosity, the concentration and the pulp feeding amount of the horizontal screw centrifuge, and the mass percentage of kaolin with the grain diameter of -2 microns can reach as high as 99.9 percent.

Description

technical field [0001] The invention relates to a production method of kaolin, in particular to a classification method of superfine kaolin. technical background [0002] Kaolin is one of the indispensable coating raw materials in the paper industry. The mass percentage content of -2μm is one of the most important technical indicators of high-grade papermaking kaolin. In order to increase the mass percentage content of kaolin -2μm, the most commonly used method is to classify with a decanter. However, the horizontal screw machine classification used in domestic kaolin production can only increase the mass percentage content of kaolin-2μm to 88%-92%, which cannot meet the high-grade paper-making coating kaolin-2μm mass percentage content of 96%-99%. Require. Contents of the invention [0003] The purpose of the present invention is to provide a kaolin grading method with simple process, low cost and stable product quality, so as to meet the needs of high-grade papermakin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/40B03B7/00
Inventor 许杰林陈晓明崔益智贺深阳阮久行曾伟清
Owner MAOMING PETROCHEM MINING IND
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