Preparation method of farmland heavy metal contaminated soil remediation mineralizer

Abstract

The invention relates to a preparation method of a farmland heavy metal contaminated soil remediation mineralizer. The preparation method comprises the following steps: simultaneously adding calcium chloride, calcium aluminate, aluminum oxide, calcium hydroxide and water into a special full-back liquid mixing membrane reactor; dispersing by a liquid distributor, fully mixing in a gap between a rotor and a stator, discharging the solution into a crystallization kettle through a discharge hole, and carrying out crystallization to prepare the mineralizer powder with a particle size of 20 nm to 5[mu]m and a purity of 99.9% or more. The method has the advantages that the prepared mineralizer can absorb heavy metal ions in farmland soil, the heavy metal ions are stably solidified in the mineralizer, the heavy metals are inactivated therefore, meanwhile, the selected raw materials are calcium chloride, calcium aluminate, aluminum oxide and calcium hydroxide, which are all common raw materials, the raw materials are easy to obtain, and thus the preparation cost of the mineralizer is greatly reduced.

Description

technical field [0001] The invention relates to the field of soil remediation, in particular to a preparation method of a mineralizer for farmland heavy metal polluted soil remediation. Background technique [0002] 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. [0003] 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 through the food chain, and finally reach the top of the food chain, where it accumul...

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Problems solved by technology

[0010] However, there are still certain defects in the above-mentioned patents: the mineralizer used to treat heavy metal ions in soil has relatively many raw material components, and the cost of some raw materials is relatively high, making the preparation cost relatively high

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