Desert, saline-alkali land back-salt blocking agent and its preparation method and application

Abstract

The invention discloses a salt-return blocking agent for desert and saline-alkali land and its preparation method and application. The raw materials thereof include acid minerals and anion surfactants, and the weight ratio of the acid minerals to the anion surfactants is 100:3-7. In the present invention, the salt-returning blocker is produced by chelation reaction between acidic minerals and anionic surfactants, forming a solid layer of hydrophobic groups on the surface of mineral particles, which can effectively prevent underground saline-alkali water from returning through capillary channels in the soil. into the soil, resulting in soil back-salt hardening, which fundamentally solves the problem of soil salinization. According to the experimental test results, the effective rate can reach more than 95%. As long as the back-salt barrier layer is not damaged, it can theoretically ensure There will be no return of salt in the soil for 2 years or even longer, which has good economic and social benefits.

Description

technical field [0001] The invention relates to the technical field of saline-alkali land improvement, and relates to the improvement of saline-alkali lands such as coastal saline areas, Huanghuai-Hai plain saline areas, deserts and desert grassland saline areas, grassland saline areas, etc. Preparation methods and applications. Background technique [0002] my country has a vast territory and abundant resources, with a land area of ​​9.6 million square kilometers. However, the arable land area is only 119 million hectares, ranking fourth in the world, and India ranks first with 156.463 million hectares. Although the population is almost the same as that of China, its land area is less than 1 / 3 of China's. China feeds 20% of the world's population with only 7% of the world's arable land. In recent years, with the construction of urbanization in our country and the intensification of land desertification caused by soil erosion, the area of ​​arable land in our country has d...

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a salt-returning barrier in deserts and saline-alkali lands, so as to solve the problem that the existing improvement methods are only effective in the current year, and still need to be improved again in the next year, which cannot fundamentally solve the problem of salt-returning in saline-alkali lands. The problem

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