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A kind of restoration method of cyanide-contaminated soil

A technology of polluted soil and remediation method, applied in the direction of restoration of polluted soil, etc., to achieve the effect of broad application prospects

Active Publication Date: 2017-05-03
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a repair method for cyanide-contaminated soil aiming at the deficiencies in the existing soil cyanide pollution control technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific example 1

[0023] Collect polluted soil around a gold mine. The sampling depth is 0-100cm. Mix the collected soil evenly, remove impurities, crush it, and divide it into two parts by quartering method. One part is analyzed for cyanide and heavy metals in the soil. . The determination method of cyanide content refers to the evaluation standard of soil environmental quality for exhibition land (provisional). The measurement result shows that the cyanide content is 330.23mg / kg (the level B limit of cyanide in the soil environmental quality evaluation standard for exhibition land is 8mg / kg). Take 300g of soil in the mixing tank, and mix it with water to make a slurry with a concentration of 30%. The pH of the slurry is 8.81, and there is no need to add medicaments to adjust the pH, and stir for 10 minutes; then add 3g of zinc sulfate to the slurry and stir for 30 minutes; then use The peristaltic pump pumps the mud into the reactor of the ozone aeration device. The ozone aeration device ado...

specific example 2

[0025] The polluted soil around the tailings pond of a gold mine was collected, and the sampling depth was 0-100cm. The collected soil was mixed evenly, impurities were removed, crushed, and divided into two parts by quartering method. Heavy metals were analyzed. The determination method of cyanide content refers to the evaluation standard of soil environmental quality for exhibition land (provisional). The measurement result shows that the cyanide content is 830.23mg / kg (the B level limit of cyanide in the soil environmental quality evaluation standard for exhibition land is 8mg / kg). Weigh 300g of soil in the mixing tank, mix it with water to make a slurry with a concentration of 30%, the pH of the slurry is 11.81, add 5g of ferrous sulfate to adjust the pH of the slurry to 8.5, and stir for 10min; then add 5g of zinc sulfate to the slurry Stir for 30 minutes; then use a peristaltic pump to pump the mud into the reactor of the ozone aeration device. The intake is 150mg. Th...

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Abstract

The invention discloses a method for repairing cyanide-contaminated soil. According to the characteristics that cyanide-contaminated soil contains various pollutants such as cyanide and heavy metals, especially cyanide also includes difficult-to-handle metal cyanide complexes Ferricyanide complexes, such as ferricyanide complexes, etc., first use ferrous sulfate and zinc sulfate to fix ferricyanide complexes and various heavy metals in the soil, and then use ozone to treat residual refractory cyanide, thiocyanate and other pollutants in the soil . Cyanide and various heavy metals in the treated soil meet the national soil environmental quality assessment requirements.

Description

technical field [0001] The invention relates to a method for treating pollutants in the field of environmental protection, in particular to a method for repairing cyanide-contaminated soil. Background technique [0002] Because cyanide has good surface activity, activation performance and complexing ability, it has been widely used in gold, electroplating, organic chemical industry and other industries in recent years, so the problem of soil cyanide pollution is becoming more and more serious. The natural degradation rate of cyanide in soil is much slower than its degradation rate in natural water bodies, and under certain conditions, it can be highly enriched in soil, which has long-term potential danger to plant growth, surface water, and groundwater. At present, the remediation technology of cyanide-contaminated soil at home and abroad is mainly based on plant method and microbial method, but due to the conditions and long cycle of plant growth, as well as the limitation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
Inventor 兰馨辉迟崇哲邱陆明丁成
Owner CHANGCHUN GOLD RES INST
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