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Method for whitening kaolin by using surface cladding method

A surface coating, kaolin technology, applied in chemical instruments and methods, inorganic pigment treatment, dyeing physical treatment, etc., can solve the problems of low whiteness value and difficult control of the reaction process, and achieve simple technical process and less equipment. , the effect of increasing added value

Inactive Publication Date: 2012-11-21
赵曰浩
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The whiteness value that this method can achieve is not high, and because there are too many related factors, the reaction process is difficult to control

Method used

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  • Method for whitening kaolin by using surface cladding method
  • Method for whitening kaolin by using surface cladding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: The kaolin without coating and whitening treatment has a blue light whiteness of 80.5.

[0029] Mix 50g of kaolin, 0.05g of anhydrous sodium carbonate, and 70ml of distilled water, adjust pH=7, ball mill 400r / m, and ball mill for 60min. Weigh 2.5 g of aluminum sulfate and dissolve it in 20 ml of distilled water, add the solution to the kaolin mud (diluted to a concentration of 10%), and continue to stir for 15 minutes. Take 2ml of 20% ammonia water and add it dropwise to the kaolin mud for 10 minutes. After the reaction, let it stand for 30 minutes. Filter and dry at 105°C for 10 hours. The measured blue light whiteness of the product is 85.5. The coating whitening technology improves the whiteness of the product by 5 degrees.

Embodiment 2

[0030] Example 2: The kaolin without coating and whitening treatment has a blue light whiteness of 79.9.

[0031] Mix 50 g of kaolin, 0.05 g of sodium hexametaphosphate, and 50 ml of distilled water, adjust pH=8, ball mill 400r / m, and ball mill for 90 minutes. Weigh 5 g of aluminum nitrate and dissolve it in 20 ml of distilled water, add the solution to the kaolin mud (diluted to a concentration of 8%), and continue to stir for 15 minutes. Take 5ml of 20% ammonia water and add it dropwise to the kaolin mud for 10 minutes. After the reaction, let it stand for 40 minutes. After filtering and drying at 105°C for 10 hours, the whiteness of the product was measured to be 85.2. The coating whitening technology improves the whiteness of the product by 5.3 degrees.

Embodiment 3

[0032] Example 3: The kaolin without coating and whitening treatment has a blue light whiteness of 77.7.

[0033] Mix 50g of kaolin, 0.1g of anhydrous sodium carbonate, and 35ml of distilled water, adjust pH=8, ball mill 400r / m, and ball mill for 120min. Weigh 7.5 g of aluminum sulfate and dissolve it in 20 ml of distilled water, add the solution to the kaolin mud (diluted to a concentration of 5%), and continue to stir for 15 minutes. Take 7.5 ml of 20% ammonia water and add it dropwise to the kaolin mud for 15 minutes. After the reaction, let it stand for 30 minutes. After filtering, drying at 105°C for 10 hours, powdering, the whiteness of the product is measured to be 86.6, and the whiteness of the product is improved by the coating whitening technology by 8.9 degrees.

[0034] Attached figure 1 It can be seen that the lamellar structure of the original sample of kaolin in Example 1 of the present invention is clear, and the particle surface is smooth and flat;

[0035] Attach...

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Abstract

The invention relates to a method for whitening kaolin by using a surface cladding method. The method comprises adding water and a dispersant into the kaolin to prepare slurry with a concentration of 40 to 60 %, adjusting a pH value to 7 to 8, and ball milling for 60 to 120 minutes with a high speed so as to fully activate the surface of the kaolin particles; and then adding an aluminum sulfate or aluminum nitrate solution into the kaolin slurry, fully mixing with stirring, slowly adding ammonia water, continuing to stir and react, standing, filtering and drying to obtain the highly whitened kaolin product. Through detection, the surface of the kaolin product is coated with an Al(OH)3 deposited layer which can shield dyeing substances in the kaolin and significantly improve whiteness of the product. The whitened kaolin through cladding can be used as papermaking paint, and especially as high-quality filling materials in the fields of plastic, rubber, etc. The implementation of the method can greatly increase added value of the low-quality kaolin, enlarge application scope of the low-quality kaolin and improve utilization efficiency of mineral resources.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and in particular relates to a method for whitening kaolin by using a surface coating method. Background technique [0002] Kaolin is an aggregate of hydrous aluminosilicates composed of various minerals. The main component is kaolinite. It is generally believed that its chemical formula is Al 2 o 3 ·SiO2 2 2H 2 O (Crystal water exists in the form of hydroxyl groups), which is composed of a layered silicon-oxygen tetrahedron and an aluminum-oxygen octahedron connected by a common oxygen ion bond to form a 1:1 type layered silicate mineral. Pure kaolin is white. Generally, kaolin mines often contain trace minerals such as montmorillonite, illite, pyrite, limonite, carbonaceous and quartz. These accompanying substances dye kaolin into various colors and seriously affect the quality of kaolin. Whiteness and application value, generally physical and chemical methods must be used to...

Claims

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Application Information

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IPC IPC(8): C09C1/42C09C3/04C09C3/06
Inventor 赵曰浩
Owner 赵曰浩
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