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Papermaking coating kaoline brightening and viscosity reducing process

A process method and kaolin technology, applied in fibrous fillers and other directions, can solve the problems that the comprehensive quality of kaolin products cannot be improved, the whiteness of kaolin cannot be guaranteed, and the effects of ensuring comprehensive product quality, stable product quality and reasonable design can be achieved.

Inactive Publication Date: 2004-09-15
茂名高岭科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it can effectively reduce the viscosity of kaolin and make the viscosity concentration reach more than 68%, it cannot guarantee the whiteness of kaolin and thus cannot improve the comprehensive quality of kaolin products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Add water and sodium hexametaphosphate to the raw materials for pulping, classify through a three-stage cyclone, discard the sorted tailings, and then perform decanter classification. The pulp concentration of the decanter classification operation: 14~ 18%, separation factor: 3500-4000. The underflow is treated as filler, and the output pulp is subjected to high-gradient magnetic separation. Control conditions for high-gradient magnetic separation operation: pulp concentration: 8-12%, PH value: 6-7, magnetic field strength: 2.0 Tesla, separation cycle: 15 minutes / times. Discard the iron-containing tailings, and then carry out chemical bleaching. The pulp concentration of chemical bleaching: 10-12%, adding sulfuric acid: 1.8 kg / ton, sodium dithionite: 6.5 kg / ton, and bleaching time: 15 minutes. After centrifugal dehydration (removing submicron ions), dehydration by pressure filtration, and then adding surfactant sodium polyacrylate: 1.5 kg / ton, surface activa...

Embodiment 2

[0026] Step is the same as embodiment one. High gradient magnetic separation operation control conditions: pulp concentration: 8-10%, PH value: 6, magnetic field strength: 1.9 Tesla, sorting cycle: 15 minutes / time. Chemical bleaching operation control conditions: pulp concentration: 8-10%, sulfuric acid: 1.7 kg / ton, sodium dithionite: 6.6 kg / ton, bleaching time: 20 minutes. Surface activation treatment operation control conditions: add surfactant sodium polyacrylate: 1.4 kg / ton. Other operating control conditions are the same as in Embodiment 1, and the product is qualified.

Embodiment 3

[0028] Step is the same as embodiment one. High gradient magnetic separation operation control conditions: pulp concentration: 10-12%, PH value: 7, magnetic field strength: 2.2 Tesla, sorting cycle: 10 minutes / time. Chemical bleaching operation control conditions: pulp concentration: 10-12%, sulfuric acid: 1.9 kg / ton, sodium dithionite: 6.6 kg / ton, bleaching time: 10 minutes. Surface activation treatment operation control conditions: add surfactant sodium polyacrylate: 1.6 kg / ton. Other operating control conditions are the same as in Embodiment 1, and the product is qualified.

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PUM

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Abstract

The invention bleaching and viscosity decreasing process for paper-making paint kaolin clay. The method adds in water, and sodium hexametahposphate into raw ore, and they are classified through triple-stage whirlcone. The tail ore are abolished, then carries on spiral classification, the bottom current is carried on with filler process, the outputted pulp are processed with high grad magnetic concentration, the iron-containing tail ore is abolished, then carries on centrifugation and desiccation, filtering desiccation, surface activating process, and dries them. The scheme is reasonable, easy to be controlled, the quality of the product is stable, the white rate of kaolin clay reach aboe 70%.

Description

technical field [0001] The invention relates to a processing method of kaolin, in particular to a whitening and viscosity-reducing process of kaolin used as high-grade paper coating Background technique [0002] Kaolin is a widely used clay mineral. Pure kaolin has high whiteness, soft texture, easy dispersion and suspension in water, good plasticity, high cohesiveness, and excellent electrical insulation properties; and has good acid resistance. Solubility, very low cation exchange capacity, good fire resistance and other physical and chemical properties. The application of kaolin in the paper industry is as a filler and as a coating pigment. When kaolin is used in papermaking, it can give the paper good covering performance and good coating gloss performance, and can also increase the whiteness, opacity, smoothness and printing adaptability of the paper, greatly improving the quality of the paper. Kaolin used for coating, especially for high-grade paper surface coating, ...

Claims

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Application Information

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IPC IPC(8): C09C1/40D21H19/40
Inventor 曾伟能陈天锡吴兆庆廖金良杨增良李书平王晓巫广权罗文照
Owner 茂名高岭科技有限公司
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