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Method for absorbing and fixing carbon dioxide through mineral carbonization

A technology of carbon dioxide and minerals, applied in the direction of silicon dioxide, chemical instruments and methods, silicon oxide, etc., can solve the problems that cristobalite cannot be separated out, affect the physical and chemical properties of montmorillonite, etc., and achieve high value-added development and utilization, good ecology Benefits, simple and feasible process

Active Publication Date: 2013-08-14
INNER MONGOLIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For these cristobalite impurities in montmorillonite, its structure, density and particle size are very close to those of montmorillonite, and they are usually symbiotic and inlaid with montmorillonite. Traditional wet purification cannot separate cristobalite by centrifugal sedimentation alone. go out
At the same time, the fine cristobalite impurities in montmorillonite will seriously affect the physical and chemical properties of montmorillonite, and have strong carcinogenicity, so the removal of cristobalite and other impurity minerals in bentonite is the key technical difficulty restricting the deep processing of bentonite

Method used

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  • Method for absorbing and fixing carbon dioxide through mineral carbonization
  • Method for absorbing and fixing carbon dioxide through mineral carbonization
  • Method for absorbing and fixing carbon dioxide through mineral carbonization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The ore composition of calcium-based bentonite is 61.4% of montmorillonite; 28.9% of cristobalite; 5.3% of quartz; 4.4% of feldspar (see X-ray diffraction pattern figure 2 , The position of the diffraction peak on the 001 plane of bentonite (2θ=6.36°) shows that the exchangeable cation between the bentonite layers is calcium ion). Add aqueous sodium carbonate solution (press filtrate after carbonization reaction) to the coarsely crushed natural calcium-based bentonite containing cristobalite impurities, fully disperse and carry out ion exchange reaction, the temperature of ion exchange reaction is 90 ° C, and the reaction time is 2 hours;

[0030] Centrifugal separation removes calcium carbonate particles and other large particles of impurities formed after the ion exchange reaction. Add 0.5 mol / L sodium hydroxide aqueous solution to the obtained bentonite slurry for alkali extraction and separation. The amount added is 1 / 5 of the mass of bentonite. The reaction temper...

Embodiment 2

[0033] The raw ore composition of calcium-based bentonite and other steps are the same as in Example 1.

[0034] In the carbon dioxide carbonation fixation reaction, the ventilation rate was 10L / min, the ventilation pressure was 0.35MPa, the carbonization reaction temperature was controlled at 60°C, and the reaction time was 45 minutes. After the carbonization fixation reaction, the carbon dioxide fixation rate was determined to be 63% by measuring the amount of carbonate in the system.

Embodiment 3

[0036] The raw ore composition of calcium-based bentonite and other steps are the same as in Example 1.

[0037] In the carbon dioxide carbonation fixation reaction, the ventilation rate was 5L / min, the ventilation pressure was 1.0MPa, the carbonization reaction temperature was controlled at 50°C, and the reaction time was 15 minutes. After the carbonization fixation reaction, the carbon dioxide fixation rate was determined to be 68% by measuring the amount of carbonate in the system.

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Abstract

The invention discloses a method for absorbing and fixing carbon dioxide through mineral carbonation, which has the advantages of simple and available process, economy, high ecological benefit and high resource utilization ratio. In the invention, a manner of absorbing and fixing carbon dioxide through mineral carbonation and a manner of deeply processing a calcium bentonite ore containing christobalite impurity are combined, and the carbon dioxide is absorbed and fixed by utilizing the characteristics that the calcium bentonite is easy to form calcium carbonate through ion exchange and is also easy to form a carbon dioxide absorption solution in the process of separating christobalite with an alkaline method so as to realize the favorable ecological benefit, meanwhile, two products of sodium montmorillonoid and silicon dioxide are obtained, therefore the aims of low energy consumption, low cost, development and utilization with high added value and carbon emission reduction of bentonite ore resources rich in christobalite are realized.

Description

technical field [0001] The invention belongs to the technology of environmental protection and resource utilization. The invention is suitable for absorbing and fixing carbon dioxide during the purification and separation process of calcium-based bentonite minerals containing cristobalite impurities, and simultaneously obtaining two products of sodium-based montmorillonite and silicon dioxide. Background technique [0002] In 1896, the Swedish scientist S. Arrhenius, the winner of the Nobel Prize in Chemistry, pioneered the concept of the "greenhouse effect" of the earth. Some components in the atmosphere, such as carbon dioxide and other gases, can pass through the short-wave radiation of sunlight, but strongly absorb long-wave radiation. Therefore, the surface of the earth is like a greenhouse covered with a layer of glass, which increases the temperature of the atmosphere, so it is called the "greenhouse effect". Six gases are currently known to play a major role in glob...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/40C01B33/12
Inventor 苏海全张兵兵王洪真宋志花孙宏娟
Owner INNER MONGOLIA UNIVERSITY
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