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Novel technique for preparing high-purity montmorillonite by deeply purifying bentonite

A technology of bentonite and montmorillonite, which is applied in the field of separation and purification of montmorillonite, which can solve the problems of variable composition, fine grains, and difficulty in the purification of calcium-based montmorillonite, and achieve the effect of reducing agglomeration and mild chemical properties

Inactive Publication Date: 2015-09-30
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main problems in the purification of bentonite are: first, due to the fine grains of montmorillonite minerals, poor crystallization, variable composition, and other impurities such as quartz and cristobalite with very fine particle sizes, its separation and purification are very difficult, especially It is especially difficult to purify calcium-based montmorillonite

Method used

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  • Novel technique for preparing high-purity montmorillonite by deeply purifying bentonite
  • Novel technique for preparing high-purity montmorillonite by deeply purifying bentonite
  • Novel technique for preparing high-purity montmorillonite by deeply purifying bentonite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Put bentonite raw ore I (grade 65%) in an oven, fully dry at 60° C. for at least 8 hours, remove free water, make montmorillonite difficult to agglomerate, and obtain bentonite to be ground.

[0069] The bentonite to be ground is crushed and ground for 60 minutes, and the dispersant sodium hexametaphosphate is added to the water suspension of bentonite ore after grinding, wherein the mass ratio of montmorillonite and water in the water suspension is 1:12, and hexametaphosphate The amount of sodium is 1.0% of the mass of bentonite:

[0070] The dispersed bentonite I suspension was magnetically stirred for 20 hours and ultrasonically treated for 30 minutes, then centrifuged at 700r / min at a low speed to remove precipitated impurities, and then centrifuged at a high speed of 10000r / min to collect the precipitate to obtain purified montmorillonite.

[0071] Wherein, the X-ray diffraction pattern of bentonite raw ore I is as follows figure 1 Shown,, the X-ray diffraction pa...

Embodiment 2

[0093] Put the bentonite raw ore I in an oven, fully dry at 60°C for at least 8 hours, remove free water, make the montmorillonite difficult to agglomerate, and obtain the bentonite to be ground.

[0094] The bentonite to be ground is crushed and ground for 30 minutes, and the dispersant sodium hexametaphosphate is added to the water suspension of bentonite ore after grinding, wherein the mass ratio of montmorillonite and water in the water suspension is 1:12, and the amount of dispersant 1.0% of the mass of bentonite;

[0095] The dispersed bentonite I suspension was magnetically stirred for 20 hours and ultrasonically treated for 30 minutes, then centrifuged at 700r / min at a low speed to remove precipitated impurities, and then centrifuged at a high speed of 10000r / min to collect the precipitate to obtain purified montmorillonite.

[0096] The X-ray diffraction pattern of gained high-purity montmorillonite powder product and figure 2 Shown similar, its purity was 93.7%, an...

Embodiment 3

[0098] Put the bentonite raw ore I in an oven, fully dry at 60°C for at least 8 hours, remove free water, make the montmorillonite difficult to agglomerate, and obtain the bentonite to be ground.

[0099] The bentonite to be ground is crushed and ground for 45 minutes, and the dispersant sodium hexametaphosphate is added to the water suspension of bentonite raw ore after grinding, wherein the mass ratio of montmorillonite and water in the water suspension is 1:12, and the amount of dispersant 1.0% of the mass of bentonite;

[0100] The dispersed bentonite suspension was magnetically stirred for 20 hours and ultrasonically treated for 30 minutes, then centrifuged at a low speed of 700r / min to remove precipitated impurities, and then centrifuged at a high speed of 10000r / min to collect the precipitate to obtain purified montmorillonite.

[0101] The X-ray diffraction pattern of gained high-purity montmorillonite powder product and figure 2 Shown similar, its purity was 94.7%, ...

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Abstract

The invention discloses a novel technique for preparing high-purity montmorillonite by deeply purifying bentonite which does not contain cristobalite. According to the novel technique, impurity phases, particularly superfine quartz concomitant with montmorillonite in calcium bentonite can be effectively removed, and furthermore, the components and the structure of prepared high-purity montmorillonite are unchanged. According to the technological idea, firstly montmorillonite and impurity quartz particles are depolymerized by virtue of a certain mechanical force, so that the occurring states of montmorillonite and quartz are changed, and the binding force between montmorillonite and quartz is weakened; secondly, the dispersing difference between montmorillonite and quartz is expanded by virtue of a small amount of dispersing agent, so that the separation is relatively easy; finally, high-yield and high-purity montmorillonite is obtained by virtue of the dispersing difference between montmorillonite and quartz through centrifugal separation. The novel technique has the characteristics of simple process, mild conditions, low equipment requirement, high product additional value and the like.

Description

technical field [0001] The invention relates to a method for separating and purifying montmorillonite, in particular to a method for separating and purifying montmorillonite from bentonite. The purified montmorillonite has high purity, high yield, and unchanged composition and structure. Background technique [0002] Bentonite is a rock with montmorillonite minerals as the main component. It is clay and clay rock with montmorillonite minerals reaching the available content. It is known as "universal clay". Bentonite has a wide range of applications. With the development of modern technology, bentonite has been introduced from traditional casting, pellets, drilling mud, adsorbents and other fields to nanomaterials, medicine, carrier materials, and fine chemicals as high value-added products. , including bentonite interlayer compounds, heat storage materials, gas filtration adsorption purification materials, conductive materials, inorganic antibacterial agents, nano thickening...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/40
Inventor 廖立兵龚志金吕国诚梅乐夫
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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