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Material of composite modified bentonite and production method

A composite modification, bentonite technology, applied in the direction of aluminum silicate, silicate, etc., can solve the problems of limited mineral resources, long mineral cycle, high cost, etc., to achieve a wide range of applications, high economic value, no waste water pollution. Effect

Inactive Publication Date: 2005-10-26
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, there are shortcomings in the technical methods so far: first, the modified product is only a single, familiar sodium bentonite; second, the physical and chemical properties of the obtained sodium bentonite cannot be further finely adjusted, and there is no suitable artificial control thirdly, the methods so far have not solved how to meet the specific performance requirements of the application field and application performance
Although, in theory, this kind of problem can be realized by carefully screening bentonite minerals and then modifying them into sodium bentonite, but, first, mineral resources are natural and there are many varieties; second, various manufacturers can apply Mineral resources are limited; third, the cycle of careful screening of minerals is long and expensive
Therefore, it is difficult to put it into industrial production by carefully screening bentonite minerals, and it is also not conducive to quality control.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7

[0024] Sodium carbonate and iron trichloride are used as the first and second modifiers respectively. Take 500Kg of natural calcium-based bentonite ore and grind it. Add sodium carbonate and ferric chloride, the mass ratio is bentonite: sodium carbonate: ferric chloride=100:8:X (X=0.5, 1.5, 2, 2.5, 3, 4, 6), in the Raymond mill Mix and grind to produce composite modified bentonite. The performance analysis results are listed in Table 1. It can be seen from the results in the table that the colloidal value and expansion capacity of the composite modified bentonite, which are closely related to the application properties, show an orderly change with the amount of modified salt and can be adjusted. When the addition amount of the second modifier ferric chloride exceeds 4%, the colloid value and expansion capacity are significantly reduced.

Embodiment 8～12

[0026]Sodium citrate and sodium chloride were used as the first and second modifiers, respectively. Take 500Kg of natural calcium-based bentonite ore and grind it. Add sodium citrate and sodium chloride, the mass ratio is bentonite: sodium citrate: sodium chloride = 100: 4: X (X = 1, 3, 5, 7, 10), sodium citrate and sodium chloride are pre-dissolved Put it into water to make a solution, stir and mix it with bentonite mineral powder to form a mass, put it into a vulcanizer, squeeze it under a pressure of 10MPa, dry and grind it, and produce a composite modified bentonite. The performance analysis results are listed in Table 2. It can be seen from the results in the table that the colloidal value and expansion capacity of the composite modified bentonite, which are closely related to the application properties, show an orderly change with the amount of modified salt and can be adjusted.

Embodiment 13～17

[0028] Sodium carbonate and iron acetate were used as the first and second modifiers, respectively. Take 500Kg of natural calcium-based bentonite ore and grind it. Add sodium carbonate and iron acetate, the mass ratio is bentonite: sodium carbonate: iron acetate = 100: 8: X (X = 1, 2, 3, 4, 5), mixed and ground in a Raymond mill to produce a composite modified Bentonite. The performance analysis results are listed in Table 3. It can be seen from the results in the table that the colloidal value and expansion capacity of the composite modified bentonite, which are closely related to the application properties, show an orderly change with the amount of modified salt and can be adjusted.

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PUM

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Abstract

The present invention relates to a compound modified bentonite material and its production method. The described compound modified bentonite material is prepared by adding first modifying agent and second modifying agent to bentonite. The described first modifying agent is sodium salt, its added quantity is 1-10% of mass of bentonite, and the second modifying agent can be water-soluble iron salt or magnesium salt or aluminium salt or calcium salt or sodium salt different from first modifying agent, and its added quatity is 0.1-10% of mass of bentonite.

Description

(1) Technical field [0001] The invention relates to a composite modified bentonite material and a production method thereof. (2) Background technology [0002] Bentonite, also known as bentonite, bentonite, etc., is a natural non-metallic mineral based on aluminosilicate. The main component of bentonite is montmorillonite, so its performance and application are mainly determined by the characteristics of montmorillonite. Montmorillonite is a silicate mineral with a layer structure of 2:1. In the crystal structure, two layers of Si-O tetrahedral layers are sandwiched by an Al-O octahedral layer to form a basic structural unit layer. Due to the isomorphic substitution phenomenon in the layer, the Si-O tetrahedron is partially replaced by the Al-O tetrahedron, and the Al-O octahedron is partially replaced by the M-O octahedron (M is a divalent metal ion). Therefore, the unit layer Internal electrostatic imbalance (0.2-0.6 negative charges per unit cell), usually Ca is introdu...

Claims

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Application Information

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IPC IPC(8): C01B33/26
Inventor 周春晖李小年葛忠华肖金龙
Owner ZHEJIANG UNIV OF TECH
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