Modified bentonite, and modification method and application thereof

A bentonite and modification technology, which is applied in the field of modified bentonite and its modification, can solve the problems of limiting bentonite expansion performance and anti-seepage performance, long-term effectiveness of anti-seepage performance is not clear, and does not have high pH value of exudate, etc. , to achieve the effect of improving sewage interception capacity, good microstructure dispersion, simple and easy-to-obtain materials and equipment

Active Publication Date: 2019-08-30
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the key technologies of these modified bentonites mostly involve commercial secrets, and it is difficult to directly apply them in related engineering applications in my country. Moreover, organic polymers are dissolved from bentonite samples under the action of high osmotic pressure, and the long-term effectiveness of anti-seepage performance is not yet clear.
At the same time, the existing organic polymer modified bentonite materials do not have the function of regulating the high pH value of the exudate. Once the leachate penetrates the barrier, it will still directly pose a pollution threat to the underground soil and water environment.
Acidified bentonite has a good effect in reducing the pH value of the exudate, but conventional acidified bentonite uses concentrated sulfuric acid or concentrated hydrochloric acid as a modifier. These high-strength acids will cause the dissolution of montmorillonite minerals and limit the expansion of bentonite to a large extent. Performance and anti-seepage performance

Method used

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  • Modified bentonite, and modification method and application thereof
  • Modified bentonite, and modification method and application thereof
  • Modified bentonite, and modification method and application thereof

Examples

Experimental program
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Embodiment 1

[0045] A modified bentonite, which is used to prevent and control strong alkaline leachate, including sodium hexametaphosphate, organic weak acid citric acid and bentonite mother soil; wherein the quality of sodium hexametaphosphate is 1% of the mass of bentonite mother soil , the quality of organic weak acid citric acid is 1‰ of the quality of bentonite.

[0046] Its modification method is as follows:

[0047] 1) Prepare organic weak acid citric acid solution and sodium hexametaphosphate solution: fully dissolve organic weak acid citric acid in deionized water to prepare 1mol / L citric acid standard stock solution, dilute the stock solution with deionized water to obtain pH =5.5, concentration is the citric acid solution of 0.1g / L; Sodium hexametaphosphate is dissolved in deionized water, prepares the sodium hexametaphosphate solution of 20g / L;

[0048] 2) Preparation of citric acid pre-modified bentonite: the ratio of the dry weight of organic weak acid citric acid to the dr...

Embodiment 2

[0058] A modified bentonite, which is used to prevent and control strong alkaline leachate, including sodium hexametaphosphate, sodium tripolyphosphate, organic weak acid citric acid and bentonite mother soil; wherein sodium hexametaphosphate and sodium tripolyphosphate The quality of citric acid is 8% of the quality of bentonite mother soil, and the quality of organic weak acid citric acid is 50‰ of the quality of bentonite.

[0059] Its modification method is as follows:

[0060] 1) Prepare organic weak acid citric acid solution and inorganic phosphorus-based polymer solution: fully dissolve organic weak acid citric acid in deionized water to prepare 1.5mol / L citric acid standard stock solution, dilute the stock solution with deionized water, Obtain a citric acid solution with a pH of 4.5 and a concentration of 0.4 g / L; dissolve sodium hexametaphosphate and sodium tripolyphosphate in deionized water to prepare a 30 g / L inorganic phosphorus-based polymer solution;

[0061] 2...

Embodiment 3

[0071] A modified bentonite, which is used to prevent and control strong alkaline leachate, including sodium hexametaphosphate, sodium tripolyphosphate, sodium pyrophosphate, organic weak acid citric acid and bentonite mother soil; wherein sodium hexametaphosphate, sodium hexametaphosphate, The quality of sodium tripolyphosphate and sodium pyrophosphate is 15% of the mass of bentonite mother soil, and the quality of organic weak acid citric acid is 1% of the mass of bentonite.

[0072] Its modification method is as follows:

[0073] 1) Prepare organic weak acid citric acid solution and inorganic phosphorus-based polymer solution: fully dissolve organic weak acid citric acid in deionized water to prepare 2mol / L citric acid standard stock solution, dilute the stock solution with deionized water to obtain A citric acid solution with a pH of 3.5 and a concentration of 0.8 g / L; sodium hexametaphosphate, sodium tripolyphosphate and sodium pyrophosphate were dissolved in deionized wa...

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Abstract

The invention discloses modified bentonite, and a modification method and an application thereof. The modified bentonite comprises an inorganic phosphorus based polymer, citric acid and parent bentonite, wherein the inorganic phosphorus based polymer is one or a mixture of more selected from the group consisting of sodium hexametaphosphate, sodium tripolyphosphate and sodium pyrophosphate. The modification method for the modified bentonite adopts a pulping and drying method and comprises the following steps: preparation of citric acid and a phosphorus-based polymer solution, preparation of citric acid pre-modified bentonite, preparation and maintenance of phosphorus-based polymer and citric acid synergistically modified bentonite slurry, and drying and grinding. The modified bentonite provided by the invention can be applied to a horizontal blocking barrier and a vertical blocking barrier which block migration of a strongly-alkaline percolate, can guarantee good anti-seepage performance and chemical corrosion resistance of blocking barriers, has the functions of regulating and controlling alkalinity of a contaminated liquid at the same time, and can be widely popularized and applied to prevention and control measures for pollution risks of the percolate in a storage yard of strongly-alkaline industrial waste residues.

Description

technical field [0001] The invention relates to a modified bentonite and its modification method and application, belonging to the technical field of contaminated site restoration. Background technique [0002] In recent years, my country's industrialization and modernization process has developed rapidly, and the production capacity of alumina, acetylene, soda ash and other chemical products has increased year by year, resulting in a large amount of strong alkaline industrial solid waste such as red mud, carbide slag and alkali slag, which are finally buried in The earth's geotechnical circle has become a concentrated pollution source of the underground environment, which poses a severe challenge to the ecological environment safety of the storage yard, and its pollution risk control has become an important task in the field of environmental protection in my country. The problem of leachate pollution in these waste dumps is very prominent, especially alkali pollution, accomp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/40
CPCC01B33/40
Inventor 杨玉玲杜延军刘松玉范日东刘志彬王菲
Owner SOUTHEAST UNIV
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