Iron removing and whitening method for indianite

A slurry and complexing agent technology, applied in the direction of aluminum silicate, silicate, etc., can solve the problems of long process cycle, unsuitable for industrial production, incomplete reaction, etc., achieve less dosage, obvious iron removal effect, low cost cheap effect

Inactive Publication Date: 2010-09-29
YUNNAN BOSHANG GAOLING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, domestic research on halloysite iron removal has not been reported, but there are many studies on kaolin iron removal, mainly using physical, chemical and biological methods
The traditional iron removal process of kaolin generally uses hydrosulfite to carry out direct iron removal experiments under acidic conditions. Due to the instability of hydrosulfite, it will cause great losses during the test process and increase the cost of the experiment.
Patent: A method for biologically removing iron and whitening kaolin by iron-reducing bacteria using molasses as a carbon source (CN101671033A). In this method, sugar factory waste molasses is used as iron-reducing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for removing iron and whitening halloysite, it comprises the steps:

[0030] Get 100g halloysite raw ore, add distilled water and be mixed with the halloysite slurry that concentration is 15wt%, be that 2mol / L sulfuric acid solution is adjusted pH=2.5 with concentration, obtain the halloysite slurry after adjusting pH;

[0031] Add 2g sodium bisulfite to the halloysite slurry after pH adjustment, 0.6g zinc powder, stirring reaction 25min, constantly regulate the pH value of slurry (with sulfuric acid solution adjustment) in this stirring reaction process, keep pH=2.5, then Add 0.8 g of tartaric acid complexing agent therein, react for 5 minutes, wash, and dry to obtain halloysite after iron removal and whitening.

[0032] The iron content of halloysite decreased from 0.73% to 0.42%, the iron removal rate was 45.20%, and the natural whiteness increased from 62.00 to 82.65.

Embodiment 2

[0034] A method for removing iron and whitening halloysite, it comprises the steps:

[0035] Get 100g halloysite raw ore, add distilled water and be mixed with the halloysite slurry that concentration is 15wt%, be that 2mol / L sulfuric acid solution is adjusted pH=2.5 with concentration, obtain the halloysite slurry after adjusting pH;

[0036] Add 2g sodium bisulfite to the halloysite slurry after pH adjustment, 0.6g zinc powder, stirring reaction 25min, constantly regulate the pH value of slurry (with sulfuric acid solution adjustment) in this stirring reaction process, keep pH=2.5, then Add 0.8g of oxalic acid complexing agent therein, react for 5min, wash and dry to obtain halloysite after iron removal and whitening.

[0037] The iron content of halloysite decreased from 0.73% to 0.50%, the iron removal rate was 31.50%, and the natural whiteness increased from 62.00 to 78.83.

Embodiment 3

[0039] A method for removing iron and whitening halloysite, it comprises the steps:

[0040] Get 100g halloysite raw ore, add distilled water and be mixed with the halloysite slurry that concentration is 15wt%, be that 2mol / L sulfuric acid solution is adjusted pH=2.5 with concentration, obtain the halloysite slurry after adjusting pH;

[0041] Add 2g sodium bisulfite to the halloysite slurry after pH adjustment, 0.6g zinc powder, stirring reaction 25min, constantly regulate the pH value of slurry (with sulfuric acid solution adjustment) in this stirring reaction process, keep pH=2.5, then Add 0.8 g of phosphoric acid complexing agent therein, react for 5 minutes, wash and dry to obtain halloysite after iron removal and whitening.

[0042] The iron content of halloysite decreased from 0.73% to 0.58%, the iron removal rate was 20.54%, and the natural whiteness increased from 62.00 to 74.23.

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Abstract

The invention relates to an iron removing and whitening method for indianite. The iron removing and whitening method for the indianite is characterized by comprising the following steps: (1) preparing the following chemical reagents: (1) reducing agents, i.e. sodium bisulfite and zinc powder; and (2) a complexing agent, i.e. any one of oxalic acid, tartaric acid and phosphoric acid; (2) preparing size, i.e. preparing indianite size the concentration of which is between 15 and 20 wt% by adding water into crude ore of the indianite and using sulfuric acid solution the concentration of which is between 1.0 and 3.0mol/L to regulate a pH value to make the pH value is between 2 and 3 to obtain the indianite size the pH value of which is regulated; (3) performing a reduction reaction, i.e. adding the reducing agents into the indianite size the pH value of which is regulated, stirring the mixture to perform a reaction for 25 to 30 minutes and continuously regulating the pH value in the process of the stirring reaction to maintain the pH value between 2 and 3 to obtain the size subjected to the reduction reaction; and (4) adding the complexing agent into the size subjected to the reduction reaction, performing a reaction for 5 minutes, washing the reaction product and drying to obtain the indianite subjected to iron removal and whitening. The iron removing and whitening method is suitable for industrial production and has obvious effect.

Description

technical field [0001] The invention relates to a method for chemically removing iron and whitening halloysite, in particular to a reduction complex iron removing method. technical background [0002] Halloysite is one of the main minerals that make up kaolin, which belongs to layered silicate, has a curly nanotube structure, and its chemical composition is the same as kaolinite. Because it contains water between its layers, it is also called multi-water kaolinite. The use of halloysite is similar to that of kaolinite, and it is also a raw material for high-quality ceramics. It can be used as a carrier for synthesizing molecular sieves and catalysts in the chemical industry, and as a filler in the plastics, rubber and paint industries. However, during the ore-forming process of halloysite, some dark minerals are often accompanied, or some color-causing elements, such as iron, titanium, and organic matter, are adsorbed in the inner cavity or surface of the halloysite tubular...

Claims

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Application Information

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IPC IPC(8): C01B33/26
Inventor 肖国琪袁六四夏云山郝佳瑞严春杰何玉婷
Owner YUNNAN BOSHANG GAOLING TECH
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