Acid magnesium aluminum hydroxide as well as preparation method and application thereof in improvement of saline-alkali soil

A magnesium aluminum hydroxide, acidic technology, applied in the direction of alumina/aluminum hydroxide, chemical instruments and methods, applications, etc., can solve the problems of modifier pollution risk, poor pertinence, narrow application range, etc., and achieve high-efficiency desalination Effects of improvement, expansion of application area, and prevention of re-salination
CN107557014AInactive Publication Date: 2018-01-09TIANJIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TIANJIN UNIV
Publication Date
2018-01-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses acid magnesium aluminum hydroxide as well as a preparation method and application thereof in improvement of coastal saline-alkali soil. An acid magnesium aluminum hydroxide isprepared by co-precipitating MgCl2 and AlCl3 at a molar ratio of 1:3 under the condition of dropping ammonia water diluted by 3 times. In the invention, from the aspect of microcosmic double electriclayers of the soil, the adsorption capacity of the soil for base cations is reduced by utilizing the overlapping of diffusion layers between negative charge saline-alkali soil colloid and prepared positive charge magnesium aluminum hydroxide colloid, so that the saline-alkali soil is desalted and improved. According to the acid magnesium aluminum hydroxide, the coastal saline-alkali soil can be remarkably improved, the soil aggregation is promoted, the salinity in the saline-alkali soil is promoted to be separated out, the pH value of the soil is decreased, and the saline-alkali soil is improved by modifying the soil on the premise of not introducing new pollutants. According to the material, the problem of salinization of the soil can be solved, and the salinization of the soil can be effectively prevented, therefore, the material is an environment-friendly material.
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Description

technical field

[0001] The invention belongs to the field of soil improvement, and in particular relates to an acidic magnesium aluminum hydroxide, a preparation method thereof and an application in coastal saline-alkaline soil improvement. Background technique

[0002] The problem of land salinization exists widely in the world, and it is an environmental problem caused by natural or human activities. Global land area 13.2×10 9 ha, of which arable land 7×10 9 ha, cultivated land 1.5×10 9 ha. About 0.34×10 in the cultivated land 9 ha (23%) is saline soil, 0.56×10 9 ha (37%) is alkaline earth, distributed in more than 100 countries. The total area of ​​saline soil in my country is about 3.6×10 7 ha, accounting for 4.88% of the country's usable land area, of which the coastal saline-alkali soil is about 1.3×10 6 ha. my country has a large population and little land, and the arable land resources are very tight. The per capita arable land is only 0.09ha, which is less ...

Claims

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