Method for carrying out deironing and whitening on kaolin

A technology of kaolin and whitening agent, applied in the direction of aluminum silicate, silicate, etc., to achieve the effect of strong reduction ability, reduced whitening treatment cost, and excellent whitening effect

Inactive Publication Date: 2012-07-18
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] The present invention aims to provide a method for iron removal and whitening of kaolin. The technical problem to be solved is to select a new kaolin whitening agent to replace hydrosulfite, and reduce the whitening cost and environmental pollution in the kaolin whitening process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 20 g of kaolin that has been ground and passed through a 60-mesh sieve, add 120 g of sulfuric acid solution with a mass fraction of 20%, keep the temperature at 95°C, stir and react for 60 minutes, then add 0.1 mL (about 0.0013 mol) of formaldehyde solution with a mass fraction of 37-40% ), kept at a constant temperature of 70°C, and stirred for 150 minutes. After the reaction, filter and wash with distilled water until no SO is detected by barium chloride 4 2- , The obtained filter cake was dried at 60° C. to obtain a whitened kaolin sample, and its whiteness was measured to be 87.8%.

Embodiment 2

[0037] Weigh 20 g of kaolin that has been ground and passed through a 60-mesh sieve, add 80 g of sulfuric acid solution with a mass fraction of 30%, keep the temperature at 95°C, stir and react for 60 minutes, and then add 0.1 mL (about 0.0013mol) of formaldehyde solution with a mass fraction of 37-40%. ) at a constant temperature of 95°C and stirred for 180 minutes. After the reaction, filter and wash with distilled water until no SO is detected by barium chloride 4 2- , The resulting filter cake was dried at 60°C to obtain a whitened kaolin sample, and its whiteness was measured to be 88.6%.

Embodiment 3

[0039] Weigh 20g of kaolin that has been ground and passed through a 60-mesh sieve, add 80g of sulfuric acid solution with a mass fraction of 30%, keep the temperature at 95°C, stir and react for 60min, then add 1.0mL (about 0.008mol) of acetaldehyde solution with a mass fraction of 40% , keep the temperature at 95°C, and stir for 150 minutes. After the reaction, separate by filtration and wash with distilled water until no SO is detected by barium chloride. 4 2- , The resulting filter cake was dried at 60° C. for 8-12 hours to obtain a whitened kaolin sample, and its whiteness was measured to be 86.8%.

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Abstract

The invention discloses a method for carrying out deironing and whitening on kaolin. The method comprises the following steps of: carrying out acid leaching on kaolin by sulfuric acid serving as a pickling agent, carrying out reduction deironing on kaolin by organic reducing agents such as formaldehyde and acetaldehyde, which replace sodium hydrosulfite and serve as a brightening agent, filtering, washing and drying to obtain a whitened kaolin sample. The method disclosed by the invention has the characteristics of simple operating process, no generation of SO2 and H2S, less environmental pollution, low operating cost and good bleaching effect.

Description

1. Technical field [0001] The invention relates to a method for removing iron and whitening kaolin, which uses sulfuric acid as a pickling agent and an organic reducing agent as a whitening agent to remove iron and whiten kaolin. 2. Background technology [0002] Kaolin is a clay rock mineral whose main component is kaolinite group minerals. It is a 1:1 type layered silicate, and its main component is SiO 2 and Al 2 o 3 , also contains a small amount of Fe 2 o 3 ,TiO 2 , MgO and other components. It has plasticity, cohesiveness, fire resistance, insulation and chemical stability, etc. It is an industrial mineral with excellent performance, widely used in ceramics, papermaking, rubber, plastics, building materials, paints, petrochemicals, etc. [0003] Pure kaolin presents the white color of kaolinite mineral itself, and the main factors causing the reduction of kaolin whiteness are organic carbon, pigment elements (such as Fe, Ti, V, Cr, Cu, Mn, etc.) and dark colors ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/26
Inventor 杨保俊杨彦王百年徐玉娟李江锋叶圣武
Owner HEFEI UNIV OF TECH
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