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Purification and discoloration process of low-grade red attapulgite clay

A technology of attapulgite clay and attapulgite, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problems of unstable decolorization effect and easy "returning to yellow", so as to improve the decolorization effect and avoid The effect of process conditions

Pending Publication Date: 2019-08-02
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these studies have played a good decolorization effect on red attapulgite, there are still unstable decolorization effects, and it is easy to "return to yellow"; use toxic reagents (such as dimethyl sulfoxide, etc.) or harsh hydrothermal conditions And other issues

Method used

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  • Purification and discoloration process of low-grade red attapulgite clay

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The low-grade (attapulgite content is less than 20%) red attapulgite clay raw ore soil is pulverized and passed through a 200-mesh sieve. The sieved raw ore soil powder is mixed with a sulfuric acid solution with a concentration of 0.5mol / l, the solid-to-liquid ratio is 1(g):10(ml), stirred ultrasonically for 1h, soaked and allowed to stand for 48h. Then through suction filtration and washing, the pretreated slurry is obtained. Then add sodium hexametaphosphate, sodium oxalate and sodium sulfide, its consumption is respectively 7%, 10% and 1% of the attapulgite clay quality, ball milling (ball material mass ratio is 1:2, rotating speed is 500r / min) 0.5h. Take it out and let it stand, decant the solution to obtain the upper layer attapulgite suspension, centrifuge, wash, dry, and pulverize to obtain high-purity off-white attapulgite.

Embodiment 2

[0029] The low-grade (attapulgite content is less than 20%) red attapulgite clay raw ore soil is pulverized and passed through a 200-mesh sieve. The sieved raw ore soil powder is mixed with hydrochloric acid solution with a concentration of 0.5mol / l, the solid-to-liquid ratio is 1(g):30(ml), stirred ultrasonically for 1h, soaked and allowed to stand for 24h. Then through suction filtration and washing, the pretreated slurry is obtained. Then add sodium hexametaphosphate, sodium oxalate and sulfide, its consumption is respectively 3%, 15% and 5% of the attapulgite clay quality, ball milling (mass ratio of ball to material is 1:1, rotating speed is 200r / min) 1h. Take it out and let it stand, decant the solution to obtain the upper layer attapulgite suspension, centrifuge, wash, dry, and pulverize to obtain high-purity off-white attapulgite.

Embodiment 3

[0031] The low-grade (attapulgite content is less than 20%) red attapulgite clay raw ore soil is pulverized and passed through a 200-mesh sieve. The sieved raw ore soil powder is mixed with a phosphoric acid solution with a concentration of 0.5mol / l, the solid-to-liquid ratio is 1(g):20(ml), stirred ultrasonically for 1.5h, soaked and allowed to stand for 24h. Then through suction filtration and washing, the pretreated slurry is obtained. Then add sodium hexametaphosphate, sodium oxalate and ferrous sulfide, its consumption is respectively 4.5%, 20% and 2.5% of the attapulgite clay quality, ball milling (ball material mass ratio is 1:3, and the rotating speed is 300r / min ) 1.5h. Take it out and let it stand, decant the solution to obtain the upper layer attapulgite suspension, centrifuge, wash, dry, and pulverize to obtain high-purity off-white attapulgite.

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Abstract

The invention relates to a purification and discoloration process of low-grade red attapulgite clay. The process comprises steps as follows: raw ore soil of low-grade red attapulgite clay (with the attapulgite content smaller than 20%) is crushed and sieved by a 200-mesh sieve; the sieved raw ore soil powder and an acid solution are mixed and subjected to ultrasonic stirring for 1 h, and the raw ore soil powder is soaked and left to stand; pretreated slurry is obtained through suction filtration and washing; sodium hexametaphosphate, sodium oxalate and a sulfur-containing compound are added tothe pretreated slurry, and the mixture is subjected to ball milling treatment; a product is taken out and left to stand, a solution is decanted, an upper attapulgite suspension is obtained, and high-purity creamy white attapulgite is obtained through centrifugation, washing, drying and smashing. The high-purity creamy white attapulgite powder is obtained from the low-grade red raw ore soil and anew way is exploited for utilization of the low-grade red attapulgite clay.

Description

technical field [0001] The invention relates to the technical field of deep processing and preparation of clay minerals, in particular to a purification and decolorization process of low-grade red attapulgite clay. Background technique [0002] Attapulgite is a crystalline hydrated magnesium aluminum silicate mineral, which has unique layer chain structure characteristics, nanoscale hole channel microstructure, large specific surface area, and mesoporous material with well-developed channels. Ideal structural material, because of its special fiber structure, excellent adsorption and decolorization properties, it is widely used in the fields of chemical industry, light industry, textile, building materials, environmental protection and pharmaceuticals. [0003] my country's attapulgite clay resources are at the forefront of the world, especially the attapulgite clay resources in the central and western parts of Gansu Province are extremely rich, with proven ore reserves reach...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/40
CPCC01B33/40C01P2006/80C01P2002/72
Inventor 刘斌姚义俊刘恺饶伟锋范栋梁孙国民成敏唐华剑
Owner NANJING UNIV OF INFORMATION SCI & TECH
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