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Method for improving colloid stability of attapulgite clay

A technology for attapulgite clay and colloidal stability, which is applied in chemical instruments and methods, drying solid materials, drying solid materials without heating, etc., to achieve the effects of increasing specific surface area, improving colloidal stability and reducing pollution

Inactive Publication Date: 2012-05-30
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, introducing vacuum freeze-drying technology into the drying treatment of attapulgite may not only realize the dissociation of attapulgite rod crystals but also maintain high colloidal properties. There is no report in this regard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add the attapulgite clay into water and stir it into a 70g / L suspension, let it stand for 24h and then centrifuge at 1500rpm for 20min; the centrifuged attapulgite clay filter cake is freeze-dried at 8-20Pa for 12h; the attapulgite clay is crushed by a pulverizer A finished product is obtained with a particle size of ≤0.074mm. Morphological analysis shows that the rod crystal aggregates of attapulgite clay treated by this process are better dissociated, the viscosity of the original soil is 425 mPa s, and the viscosity of the treated sample is 1687 mPa s, which is about 4 times higher than that of the untreated sample. times.

Embodiment 2

[0017] Add the attapulgite clay into water and stir it into a suspension of 100g / L. After standing for 24h, centrifuge at 3000rpm for 30min; after centrifugation, the attapulgite clay filter cake is freeze-dried at 10-15Pa for 8h; the attapulgite clay is crushed by a pulverizer. A finished product is obtained with a particle size of ≤0.074mm. Morphology analysis shows that the rod crystal aggregates of attapulgite clay treated by this process are better dissociated, the viscosity of the original soil is 425 mPa s, and the viscosity of the treated sample is 1584 mPa s, which is about 3 times higher than that of the untreated sample. times.

Embodiment 3

[0019] Add the attapulgite clay into water and stir it into a suspension of 120g / L. After standing for 24 hours, centrifuge at 3000rpm for 20 minutes; the centrifuged attapulgite clay filter cake is freeze-dried at 5-15Pa for 20 hours; the attapulgite clay is crushed by a pulverizer. A finished product is obtained with a particle size of ≤0.074mm. Morphological analysis shows that the rod crystal aggregates of attapulgite clay treated by this process are better dissociated, the viscosity of the original soil is 425 mPa s, and the viscosity of the treated sample is 882 mPa s, which is about 2% higher than that of the untreated sample. times.

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Abstract

The invention discloses a method for improving the colloid stability of attapulgite clay. According to the invention, a principle that moisture is converted into gas from solid ice under a vacuum condition is adopted to dehydrate and dry materials, the specific surface area of the attapulgite clay is increased, the agglomeration of attapulgite clay rod crystals is reduced, and thus the colloid stability of the attapulgite clay is increased.

Description

technical field [0001] The invention relates to a method for improving the stability of attapulgite clay colloid by vacuum freeze-drying. Background technique [0002] Due to its unique structure, attapulgite clay has been widely used in the fields of drilling mud, edible oil decolorization, functional compound fertilizer, desiccant, adsorbent and coating. Colloidal suspension stability is one of the most important properties of attapulgite clay, but because attapulgite clay rod crystals mostly exist in the form of stable aggregates, the colloidal stability of attapulgite clay has not been fully utilized. At present, the improvement of the suspension stability of the attapulgite clay colloid is mainly achieved by adding surfactants, but this method does not highlight the performance of the attapulgite clay itself. [0003] The microstructure of attapulgite clay includes three levels: one is the basic structural unit of attapulgite clay, that is, rod-shaped single crystal, r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/40F26B5/06
Inventor 王爱勤王文波徐继香杨效和
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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