Slow-release soil repair agent for arsenic and cadmium pollution and preparation method of slow-release soil repair agent

Abstract

The invention provides a slow-release soil repair agent for arsenic and cadmium pollution and preparation of the slow-release soil repair agent. The soil repair agent is prepared from a repair base, anutrient medium, a sol base and water according to the mass ratio of (1.5 to 2): (0.4 to 1.0): (0.5 to 1.5): (2 to 5), the repair base is prepared from the following components: a prefabricated carrier, magnesium nitride and ethylenediamine tetraacetic acid disodium magnesium, and the prefabricated carrier is prepared from iron tailings and a machine-made carbon compound according to the mass ratio of 1: (1 to 2), wherein the nutrient medium comprises the following components: bagasse, a fermented cake fertilizer and Glucosan; the sol base comprises amino clay and sodium metasilicate; according to the invention, reasonable prefabrication and compounding are carried out; the raw materials are finely selected and proportioned and have a synergistic effect; according to the soil repair agent, the adsorption efficiency of the soil repair agent on various heavy metals is effectively improved, the slow release property of effective components is strong, the effective period of the adsorption effect is prolonged by more than three times, and meanwhile, the soil repair agent also has excellent soil structure and nutrition improvement property, the comprehensive quality of soil componentsis remarkably improved, and the planting benefit is obviously improved.

Description

technical field [0001] The invention relates to the technical field of soil remediation agents, in particular to a slow-release soil remediation agent for arsenic and cadmium pollution and its preparation. Background technique [0002] China has a large population, and food strategic security has always been the number one national policy. At the same time, it is accompanied by limited arable land area, low planting efficiency, and it is difficult to realize crop rotation. In order to ensure increased rice production, the amount of chemical fertilizers had to be increased year by year. However, the existing chemical fertilizers are easy to cause soil compaction, and the effectiveness in the soil is very low. Long-term use of chemical fertilizers leads to soil compaction in paddy fields, decreased soil air permeability, lack of organic matter, decline in fertility, and secondary salinization and acidification of the soil. The imbalance of nutrient elements will hinder the g...

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Problems solved by technology

However, the curing method requires a large amount of curing agent, which is easy to cause damage to the soil, and is generally used for small-scale soil restoration with serious arsenic pollution.

[0004] At present, the problem of soil heavy metal pollution is already a research hotspot and a key issue that urgently needs to be improved. However, the current soil remediation agents still have problems such as short effective repair period, high residual rate, and large loss rate of soil nutrients, which greatly limit The comprehensive effect of the application of soil remediation agents still cannot meet the demand, and further improvement and improvement are needed

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