Remediation reagent for mine soil contaminated with heavy metal lead and use method of remediation reagent

Abstract

The invention provides a remediation reagent for mine soil contaminated with heavy metal lead and a use method of the remediation reagent, and belongs to the field of environmental treatment. The remediation reagent is prepared from, by weight, 10-30 parts of calcium hydrogen phosphate, 15-25 parts of ammonium dihydrogen phosphate, 10-20 parts of potassium dihydrogen phosphate, 5-10 parts of sodium dihydrogen phosphate, 10-20 parts of an alkaline regulator, 60-90 parts of soil fillers and 100-200 parts of natural ore powder. The remediation reagent for the mine soil contaminated with the heavymetal lead and the use method of the remediation reagent have the advantages that the calcium hydrogen phosphate, the ammonium dihydrogen phosphate, the potassium dihydrogen phosphate and the sodiumdihydrogen phosphate are acidic substances, three natural mineral powders of optimized apatite powder, hydroxyapatite powder and phosphate rock powder are also acidic, the alkaline regulator is of course alkaline, and the two soil fillers of lime and cement are also alkaline, so that the acid-base balance can be coordinated while free lead is fixed, all the selected substances can effectively fixthe free lead, thereby reducing the content of the free lead in the soil to a qualified standard, and the selected substances can act as fertilizers for subsequent plant planting.

Description

technical field [0001] The invention belongs to the field of environmental treatment, in particular to a mine soil restoration reagent polluted by heavy metal lead and its application method. Background technique [0002] With the continuous development of society, people pay more and more attention to the problem of environmental pollution. At present, the pollution of heavy metals is more serious in soil pollution. Heavy metals cannot be decomposed by soil microorganisms, but are easy to accumulate and transform into more toxic methyl compounds, and some even accumulate in the human body at harmful concentrations through the food chain, seriously endangering human health. Soil heavy metal pollutants mainly include lead, cadmium, mercury, arsenic, chromium, copper, iron, zinc and so on. Lead is a common element in soil pollution, and mining, metal smelting, and coal burning are also important sources of pollution. In particular, the lead content in the soil near mines and...

AI Technical Summary

Problems solved by technology

Therefore, cereal stalks produced in lead-contaminated soil are not easy to be used as feed

For the soil pollution of heavy metal lead, there are many methods such as chemical method and physical method to control the soil pollution, the most common of which is soil remediation reagent, because it does not separate the free lead but fix the free lead, so that plants It can no longer absorb free lead, thus playing a role in the control of soil pollution caused by heavy metal lead. Therefore, the cost of soil remediation reagents is relatively low and the effect is significant, and it is the most widely used. However, the current soil remediation reagents only fix lead after remediation. ions, and the acid-base balance of the soil itself will be destroyed. If you want to continue planting plants, you will need to consume more resources for ecological environment restoration, thus increasing the cost of soil restoration.

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