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Method for purifying montmorillonite from bentonite ore by twice dispersion method

A technology of bentonite ore and bentonite, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems affecting purification efficiency and difficult removal of associated ore impurities

Inactive Publication Date: 2009-03-25
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] All of the above purification methods, except electrophoresis, are difficult to open the "I" structure of montmorillonite, so the associated mineral impurities mixed in it are difficult to remove, thus affecting the purification efficiency

Method used

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  • Method for purifying montmorillonite from bentonite ore by twice dispersion method
  • Method for purifying montmorillonite from bentonite ore by twice dispersion method
  • Method for purifying montmorillonite from bentonite ore by twice dispersion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Raw ore processing

[0036] Weigh 100g of bulk bentonite raw ore, the content of montmorillonite is 71.4%, crush the bulk bentonite until the volume is less than 1cm 3 , soaked in tap water for 2 hours to make a pulp with a concentration of 20%, passed through a 100-mesh sieve, and then added water to make a 15% pulp;

[0037] add gas dispersant

[0038] Select 17.5ml of 10% hydrogen peroxide aqueous solution and add it to the pulp, stir evenly, and let it stand still for 60 minutes, so that hydrogen peroxide can fully penetrate into the lamellar structure; The color makes it whiter. At the same time, hydrogen peroxide does not produce pollution. Only heating can achieve foaming, expansion and stretching of the "I" structure, so that the tiny impurities hidden in it will slide and precipitate due to the loss of support. Hydrogen peroxide itself has no effect on the performance of montmorillonite due to thermal decomposition;

[0039] Add sodium pyrophosphate dispersa...

Embodiment 2

[0044] Raw ore processing

[0045] The content of powdered raw ore montmorillonite is 80% bentonite and 100g bentonite is directly mixed with tap water into 5% ore slurry;

[0046] add gas dispersant

[0047] Select 20ml of 15% hydrogen peroxide aqueous solution and add it to the pulp, stir evenly, and let it stand still for 60 minutes, so that hydrogen peroxide can fully penetrate into the lamellar structure;

[0048] Add sodium pyrophosphate dispersant

[0049] Add 2g of sodium pyrophosphate into the pulp, stir evenly, heat at 60°C for 45min, and let stand still for 5 hours;

[0050] Upper slurry treatment

[0051] The dispersed pulp is extracted from the upper layer of pulp, and then dried by a conventional drying method to obtain a dry product with a montmorillonite content of 98.4%.

Embodiment 3

[0053] Raw ore processing

[0054] 100 g of bentonite powder with a montmorillonite content of 79.7% is directly prepared into a 10% slurry with tap water;

[0055] add gas dispersant

[0056] Select 20ml of 10% hydrogen peroxide aqueous solution and add it to the pulp, stir evenly, and let it stand still for 30 minutes, so that hydrogen peroxide can fully penetrate into the lamellar structure;

[0057] Add sodium pyrophosphate dispersant

[0058] Add 1.8g of sodium pyrophosphate into the pulp, stir evenly, heat at 80°C for 45min, and let stand still for 1 hour;

[0059] Upper slurry treatment

[0060] The dispersed pulp is extracted or the upper layer pulp is poured, and then dried by a conventional drying method to obtain a dry product with a montmorillonite content of 96.3%.

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Abstract

The invention relates to a method for purifying montmorillonite from bentonite ore by using double dispersion method; the method adopts the hydrogen peroxide as dispersant of 'I'-shaped structure, then the hydrogen peroxide is fully mixed with the pulp so as to cause the hydrogen peroxide to be completely infiltrated into each film layer of the 'I'-shaped structure, later sodium pyrophosphate dispersant is added and conclusion is opened so as lower the pulp viscosity, ease the impurities gravity settlement, and provide a relatively 'smooth' path for the impurities settlement inside and outside the 'I'-shaped structure. As the added gas dispersant is provided with stronger oxidation, the hydrogen peroxide is decomposed into gas under slightly-heating circumstance, and the gas is expanded for distracting the 'I'-shaped structure so as to cause the hidden impurities to be precipitated due to the loss of support, thereby eliminating a small amount of organic substances in the natural bentonite by oxidation and simultaneously playing a bactericidal action, and purifying montmorillonite by separation as any pollution is not brought. The method is non-toxic, has simple operation process, and can easily achieve batch production.

Description

technical field [0001] The invention relates to a method for purifying montmorillonite, in particular to a method for purifying montmorillonite from bentonite ore by two dispersion methods. Background technique [0002] Montmorillonite (also known as montmorillonite, bentonite, bentonite, bentonite) is the main mineral component in bentonite ore. It is composed of two layers of silicon-oxygen tetrahedron sandwiching a layer of aluminum-oxygen octahedron. 2:1 type layered silicate minerals. Since the silicon in the tetrahedron can be replaced by low-priced aluminum or even phosphorus and titanium elements, the aluminum in the octahedron can be replaced by divalent magnesium, iron, zinc and monovalent lithium, etc., this low-valent ion replaces the high-valent ion The behavior of montmorillonite leads to strong electronegativity of montmorillonite. Due to the effect of static electricity, each montmorillonite sheet does not overlap one by one but is combined in an "I"-shaped ...

Claims

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Application Information

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IPC IPC(8): C01B33/38
Inventor 黎艳郭新锋王娟芳王晓军
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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