A kind of modified bentonite and its modification method and application

A technology of bentonite and bentonite waterproof blanket, which is applied in the direction of chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problem of limiting the expansion performance and anti-seepage performance of bentonite, the long-term effectiveness of anti-seepage performance is not clear, and there is no exudate Problems such as high pH value, to achieve the effect of prolonging the time of breaking down the barrier barrier, good microstructure dispersion, and easy access to materials and equipment

Active Publication Date: 2022-06-28
SOUTHEAST UNIV
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  • 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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  • A kind of modified bentonite and its modification method and application
  • A kind of modified bentonite and its modification method and application
  • A kind of modified bentonite and its modification method and application

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Embodiment 1

[0045] A modified bentonite, the modified bentonite is used for resistance and control of 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 quality of the 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 the organic weak acid citric acid in deionized water, prepare a 1mol / L citric acid standard stock solution, and dilute the stock solution with deionized water to obtain pH =5.5, a citric acid solution with a concentration of 0.1g / L; dissolving sodium hexametaphosphate in deionized water to prepare a 20g / L sodium hexametaphosphate solution;

[0048] 2) Preparation of citric acid pre-modified bentonite: with a ratio of 1‰ of the dry weigh...

Embodiment 2

[0058] A modified bentonite, the modified bentonite is used for resistance and control of strong alkaline leachate, including sodium hexametaphosphate, sodium tripolyphosphate, organic weak acid citric acid and bentonite mother soil; wherein sodium hexametaphosphate and sodium tripolyphosphate The mass of bentonite is 8% of the mass of the native bentonite, and the mass of the organic weak acid citric acid is 50‰ of the mass of the 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 the organic weak acid citric acid in deionized water, prepare a 1.5mol / L citric acid standard stock solution, and dilute the stock solution with deionized water, A citric acid solution with pH=4.5 and a concentration of 0.4g / L was obtained; sodium hexametaphosphate and sodium tripolyphosphate were dissolved in deionized water to prepare a 30g / L inorganic phosphorus-based...

Embodiment 3

[0071] A modified bentonite, the modified bentonite is used for resistance and control of strong alkaline leachate, including sodium hexametaphosphate, sodium tripolyphosphate, sodium pyrophosphate, organic weak acid citric acid and bentonite mother clay; wherein sodium hexametaphosphate, The mass of sodium tripolyphosphate and sodium pyrophosphate is 15% of the mass of the bentonite mother clay, and the mass of the organic weak acid citric acid is 1% of the mass of the 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 the organic weak acid citric acid in deionized water, prepare a 2mol / L citric acid standard stock solution, and dilute the stock solution with deionized water to obtain A citric acid solution with pH=3.5 and a concentration of 0.8g / L; dissolving sodium hexametaphosphate, sodium tripolyphosphate and sodium pyrophosphate in deionized ...

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Abstract

The invention discloses a modified bentonite and its modification method and application. The modified bentonite includes an inorganic phosphorus-based polymer, citric acid and bentonite mother soil; wherein the inorganic phosphorus-based polymer is sodium hexametaphosphate, trimer A mixture of one or more of sodium phosphate or sodium pyrophosphate; the modification method adopts pulping and drying method, and the steps include citric acid and phosphorus-based polymer solution configuration, citric acid pre-modified bentonite preparation, phosphorus-based polymer Synergistic citric acid modified bentonite slurry preparation and curing, drying and grinding. The modified bentonite provided by the present invention can be applied to horizontal barrier barriers and vertical barrier barriers that block the migration of strong alkaline leachate, which can ensure the good anti-seepage performance and chemical corrosion resistance of the barrier barrier, and can control pollution The function of liquid alkali can be widely used in the pollution risk prevention and control measures of leachate from strong alkaline industrial waste dumps.

Description

technical field [0001] The invention relates to a modified bentonite, a modification method and application thereof, and belongs to the technical field of polluted 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 chemicals has increased year by year, resulting in a large amount of strong alkaline industrial solid waste such as red mud, calcium carbide slag and alkali slag. The earth's geosphere has become a concentrated source of pollution in the underground environment, which poses a serious 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 leachate pollution problems of these waste slag yards are very prominent, with alkali pollution being the most significant, accompanied by...

Claims

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Application Information

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Patent Type & Authority Patents(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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