Preparation method of farmland heavy metal contaminated soil repairing mineralizer

Abstract

The invention relates to a preparation method of a farmland heavy metal contaminated soil repairing mineralizer. Calcium chloride, calcium aluminate, aluminum oxide, calcium hydroxide and water are simultaneously added into a fully backmixing liquid film reactor for liquid-liquid two-phase co-precipitation reaction according to certain ratios, then are dispersed by a liquid distributor, and are fully mixed in a gap between a rotor and a stator, and a mixture is discharged through a material outlet to a crystallizing kettle for crystallization, so that mineralizer powder with the particle size being 20 nm to 5 [mu]m and the purity being 99.9 percent or above. The preparation method has the advantages that the mineralizer prepared with the preparation method can adsorb heavy metal ions in soil of a farmland, and the heavy metal ions are stabilized and solidified in the mineralizer and are inactivated; meanwhile, all raw materials, such as the calcium chloride, the calcium aluminate, the aluminum oxide and the calcium hydroxide, are common raw materials, so that the raw materials are readily available, and the preparation cost of the mineralizer is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, relates to the technical field of soil pollution control, in particular to [0002] And a preparation method of a farmland heavy metal polluted soil remediation mineralizer. Background technique [0003] Soil is a very important natural resource and the foundation of a country's agricultural development. As the foundation of agriculture, soil is the source of basic raw materials for human survival. The remediation of heavy metal-contaminated soil is a major problem nowadays, and the heavy metals mainly refer to several elements with significant biological toxicity such as Cd, Pb, Cr, Zn, Hg and metalloid As, as well as common elements such as Mn, Ni, Cu, etc. element. [0004] Due to the characteristics of universality, concealment or latentness, irreversibility, indirect harmfulness and surface aggregation of heavy metal pollution, it can be continuously enriched in organisms...

AI Technical Summary

Problems solved by technology

The heavy metal ion mineralizer developed by the present invention has good mineralization ability for heavy metal ions, and can be widely used in farmland, industrial sites, Gobi, deserts and other places polluted by heavy metal ions, and can also be used in domestic sludge containing heavy metal ions It is a green and environmentally friendly agent for the treatment and restoration of industrial sludge, drilling waste fluid and oily sludge in oil fields; however, the invention is used to treat the mineralizer of heavy metal ions in the soil, and the raw material composition of the preparation is relatively low. Many, and the cost of some raw materials is relatively high, making the preparation cost relatively high

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