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Production method of superfine kaolin

An ultra-fine kaolin, production method technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problem of not reaching high-grade papermaking coating materials and the like

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, domestic manufacturers can only increase the mass percentage content of -2μm to 88% to 92% by using decanter machine classification, which cannot meet the requirements of high-grade paper coating materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. The kaolin ore is mined by the hydromechanical method, and the pulp is obtained by removing impurities through the φ2400mm high weir type spiral classifier and the three-stage hydrocyclone (the first stage φ250mm, the second stage φ150mm, and the third stage φ75mm), and settles and dehydrates to The mass percentage concentration is 18-20%;

[0027] 2. Add the above pulp to caustic soda to adjust the pH value to 6.0-6.5; add the dispersant sodium hexametaphosphate to adjust the viscosity of the pulp to 50-60mPa·s;

[0028] 3. Mix the pulp obtained in step 2 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%;

[0029] 4. Put the ore pulp obtained in step 3 into the octagonal mixing tank. According to the dry weight of the...

Embodiment 2

[0035] 1. The kaolin ore is mined by the hydromechanical method, and the pulp is obtained by removing impurities through the φ2400mm high weir type spiral classifier and the three-stage hydrocyclone (the first stage φ250mm, the second stage φ150mm, and the third stage φ75mm), and settles and dehydrates to The mass percentage concentration is 16.0-18.0%;

[0036] 2. Add the above pulp to caustic soda to adjust the pH value to 6.0-6.5; add the dispersant sodium hexametaphosphate to adjust the viscosity of the pulp to 40-50mPa·s;

[0037] 3. Mix the pulp obtained in step 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 99.8% kaolin slurry;

[0038] 4. Put the ore pulp obtained in step 3 into the octagonal mixing tank. According to th...

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PUM

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Abstract

The invention relates to a production method of superfine kaolin, comprising the steps of collecting slurry, removing impurities, preparing kaolin pulp, classifying by adopting a horizontal screw centrifuge, chemical bleaching, washing to remove the iron, filter pressing, dispersing to prepare the slurry, sieving, spray drying and the like. The invention has simple operation, low cost and stable product quality. The kaolin product with mass percentage of 93-99.9 percent and with the grain diameter of -2 microns can be obtained by classifying with the horizontal screw centrifuge without delaminating.

Description

technical field [0001] The invention relates to a production method of superfine kaolin, in particular to a production process of sandy kaolin suitable for papermaking and coating. technical background [0002] Kaolin is one of the indispensable coating raw materials in the paper industry. The most important performance indicators of kaolin for high-grade papermaking coating include whiteness, -2μm mass percentage content and viscosity concentration. The corresponding key technologies for kaolin production include impurity removal, whitening, classification, ultra-fine processing and viscosity reduction. The -2μm mass content of kaolin is generally improved by hydrocyclone removal of impurities, decanter grading and flaking techniques, of which the flaking techniques are divided into mechanical flaking and chemical intercalation flaking. [0003] The energy consumption of mechanical peeling is high, the output of a single machine is low, and the production cost is high. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/40D21H19/64
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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