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A red mud matrix modifier, its preparation and application method

A technology of improver and red mud, which is applied in the direction of chemical instruments and methods, applications, soil preparation methods, etc., can solve the problems of poor continuity of alkaline regulation, achieve the goals of reducing salinity and alkalinity, improving regulation effect, and improving water and fertilizer retention performance Effect

Active Publication Date: 2022-04-22
CENT SOUTH UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The application of organic acids or inorganic acids also has problems such as poor alkalinity adjustment continuity

Method used

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  • A red mud matrix modifier, its preparation and application method
  • A red mud matrix modifier, its preparation and application method

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preparation example Construction

[0041] The preparation method of the red mud matrix modifier provided by the invention comprises the following steps:

[0042] (1) Take agricultural solid waste stalks, such as harvested stalks of rice, wheat, corn, sugar cane, etc. After natural air drying, the mechanical stage is below 5cm to obtain crushed straw; the crushed straw, Mix it with alkaline red mud leachate according to the mass ratio of 100:50-200, let it stand for 1-10 days and then dry it for later use; The mass ratio is 1:2-10, mix and oscillate for 1-5 hours and then stand still, and the supernatant is taken as the red mud leachate.

[0043] (2) Take the soil and add 3 to 7 times its mass of sterile water, shake it for 2 to 30 minutes and let it stand, and take the supernatant to be the soil bacteria suspension; the soil is preferably saline-alkali soil or natural soil;

[0044] (3) Mix the alkali-degraded straw obtained in step (1) with the soil bacterial suspension obtained in step (2) according to a mat...

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Abstract

The invention discloses a red mud substrate improver, its preparation method and application. It comprises a combination of 3-15 parts by mass of alkali-degraded straw and 3 parts by mass or more of soil bacteria suspension; the pH value of the alkali-degraded straw is between 7.5-9.0. The red mud matrix improver provided by the invention can reduce red mud salinity, improve physical structure, increase nutrient content and strengthen microbial community stability, so that the improved red mud can support plant growth. The used improver components come from a wide range of sources, are low in cost, are environmentally friendly, and are easy to promote on a large scale. It is suitable for large-scale engineering applications and has important practical significance for the ecological restoration of red mud storage yards.

Description

technical field [0001] The invention belongs to the technical field of smelting site restoration, and more specifically relates to a red mud matrix modifier, its preparation and application method. Background technique [0002] Red mud is a highly alkaline solid waste discharged during the production process of alumina industry. It has strong alkalinity and high salinity, making it difficult to comprehensively utilize it. At present, the comprehensive utilization rate of red mud is less than 5%, and the discharged red mud is mainly stockpiled. In 2019, the global accumulation of red mud to be treated is about 4.2 billion tons, and it is growing at a rate of 150 million tons per year. The ecological safety of red mud stockpiles has become the most important factor restricting the sustainable development of the global alumina industry. Reducing the salinity and alkalinity of red mud, improving the structure of red mud, and realizing the vegetation reconstruction of red mud s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/32C09K101/00C09K109/00
CPCC05G3/80C05D3/02A01B79/02C09K17/32B09C1/08C09K2101/00C09K2109/00C05D9/00C05F7/00C05F11/00C05F11/08
Inventor 朱锋薛生国江钧吴昊可文舜刘政范家荣
Owner CENT SOUTH UNIV