Soil Cd and Pb repairing agent and preparation method thereof

A remediation agent and soil technology, applied in soil conditioning materials, chemical instruments and methods, organic fertilizers, etc., can solve problems such as damage to land availability, land pollution, damage to land restoration capabilities, etc., to reduce the toxicity of heavy metals in soil and stabilize good effect

Pending Publication Date: 2020-05-08
江西省地质环境监测总站
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Large-scale mining and smelting of minerals have caused the land to be polluted by heavy metals, which no

Method used

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  • Soil Cd and Pb repairing agent and preparation method thereof

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Example Embodiment

[0021] Example 1

[0022] A method for preparing soil Cd and Pb remediation agent, comprising the following steps:

[0023] (1) Heat the corn stalks in a nitrogen atmosphere to 520±10°C and keep them for 3 hours. After the heat preservation, cool to normal temperature under nitrogen protection to obtain biochar. Grind the biochar and pass through a 40-mesh screen to obtain biochar powder ;

[0024] (2) A mixed aqueous solution of Zoysia japonica-Sedum sedum complex extract, sodium dioctyl sulfosuccinate, and magnesium chloride, the composite extract of Zoysia japonica-Sedum sedum, dioctyl succinate The concentration of each component in the mixed aqueous solution of sodium and magnesium chloride is: Zoysia japonica-Sedum southeast composite extract 100mL / L, dioctyl sodium succinate sulfonate 6g / 300mL, magnesium chloride 2g / 300mL, and the rest are water. The biochar powder is placed in a dilute hydrochloric acid solution with a solute mass fraction of 5% for 10 minutes, and the mas...

Example Embodiment

[0031] Example 2

[0032] A method for preparing soil Cd and Pb remediation agent, comprising the following steps:

[0033] (1) Heat the corn stalks in a nitrogen atmosphere to 520±10°C and keep them for 3 hours. After the heat preservation, cool to normal temperature under nitrogen protection to obtain biochar. Grind the biochar and pass through a 40-mesh screen to obtain biochar powder ;

[0034] (2) A mixed aqueous solution of Zoysia japonica-Sedum sedum complex extract, sodium dioctyl sulfosuccinate, and magnesium chloride, the composite extract of Zoysia japonica-Sedum sedum, dioctyl succinate The concentration of each component in the mixed aqueous solution of sodium and magnesium chloride: 130mL / L of Zoysia japonica-Sedum sedum complex extract, dioctyl sodium succinate sulfonate 8g / 300mL, magnesium chloride 4g / 300mL, and the rest are water. The biochar powder is placed in a dilute hydrochloric acid solution with a solute mass fraction of 5% for 10 minutes, and the mass of t...

Example Embodiment

[0041] Example 3

[0042] A method for preparing soil Cd and Pb remediation agent, comprising the following steps:

[0043] (1) Heat the corn stalks in a nitrogen atmosphere to 520±10°C and keep them for 3 hours. After the heat preservation, cool to normal temperature under nitrogen protection to obtain biochar. Grind the biochar and pass through a 40-mesh screen to obtain biochar powder ;

[0044] (2) A mixed aqueous solution of Zoysia japonica-Sedum sedum complex extract, sodium dioctyl sulfosuccinate, and magnesium chloride, the composite extract of Zoysia japonica-Sedum sedum, dioctyl succinate The concentration of each component in the mixed aqueous solution of sodium and magnesium chloride is: 180mL / L of Zoysia japonica-Sedum sedum complex extract, dioctyl sodium succinate 9g / 300mL, magnesium chloride 7g / 300mL, and the rest are water. The biochar powder is placed in a dilute hydrochloric acid solution with a solute mass fraction of 5% for 10 minutes, and the mass of the dilu...

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Abstract

The invention discloses a preparation method of a soil Cd and Pb repairing agent. The preparation method comprises the following steps: (1) preparing corn straw biochar powder; (2) performing hydrothermal treatment on the charcoal powder by using a mixed aqueous solution of a zoysia japonica-sedum alfredii hance composite extract, sodium diethylhexyl sulfosuccinate and magnesium chloride; (3) soaking in an aqueous solution of potassium glutamate, citric acid, trimethylpyruvic acid and phenylethylamine; (4) soaking in a mixed aqueous solution of phosphoric acid and sodium pyrophosphate; and (5)performing hydrogen peroxide soaking. The soil repairing agent prepared through the method is good in stabilizing effect on Cd and Pb, Cd and Pb in treated soil are remarkably converted from an acid-soluble state to a residue state, and the toxicity of heavy metals in the soil is obviously reduced.

Description

technical field [0001] The invention belongs to the technical field of production of petrochemical product nitrate, in particular to a purification method of isooctyl nitrate. Background technique [0002] Soil polluted by heavy metals usually refers to heavy metals such as Pb, Cd, and elements with the same physical and chemical properties as metals, such as As and other pollutants, which exceed the self-purification capacity of the soil and cause soil heavy metal pollution. Soil pollution by heavy metals has also caused a variety of environmental problems. Soil heavy metal pollution is a phenomenon that due to human activities, the content of heavy metals in the soil increases, causing its content to be significantly higher than the local background value, which eventually leads to the deterioration of the ecological environment. In recent years, with the great prosperity and development brought about by the reform and opening up, while accelerating economic construction,...

Claims

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Application Information

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IPC IPC(8): C09K17/40
CPCC09K17/40
Inventor 储小东廖伟熊卿张湘文钟文军储智博吴少利
Owner 江西省地质环境监测总站
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