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Preparation of curing stabilizing agent for treating heavy metal-polluted soil and use method thereof

A technology of polluted soil and heavy metals, applied in the restoration of polluted soil, chemical instruments and methods, soil conditioning materials, etc., can solve the problems of complex heavy metal pollution effects and general problems, and achieve simple and easy preparation methods, simple materials, Wide range of raw materials

Inactive Publication Date: 2015-10-14
中咨国宜(北京)环境修复技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inorganic soil stabilizers currently used generally use ordinary Portland cement as the main raw material, and are mixed with other cementitious materials, alkali activators and surfactants for soil remediation.

Method used

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  • Preparation of curing stabilizing agent for treating heavy metal-polluted soil and use method thereof
  • Preparation of curing stabilizing agent for treating heavy metal-polluted soil and use method thereof
  • Preparation of curing stabilizing agent for treating heavy metal-polluted soil and use method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037]Grind the raw materials magnesium oxide, magnesium chloride, magnesium carbonate, calcium oxide, and calcium carbonate into materials with a particle size of not less than 250 meshes, and mix them evenly according to the mass ratio of 70% of magnesium-based compounds, 25% of calcium-based compounds, and 5% of phosphate to obtain curing stabilizer.

[0038] On the basis of Example 1, various embodiments can be obtained by changing the proportion of magnesium-based and calcium-based compounds and the composition of phosphate and sulfide in special components.

[0039] The use method and laboratory example 1 of curing stabilizer mercury pollution in a chemical site:

[0040] (1) Determination of total mercury content in soil by the detection method stipulated in "Determination of Total Mercury in Soil by Cold Atomic Absorption Spectrophotometry (GB / T17136-1997)"; / T299-2007) to obtain the leachate, and use the method specified in "Determination of Total Mercury in Solid Wa...

Embodiment 2

[0048] (1) Grinding the raw materials magnesium oxide, magnesium chloride, magnesium carbonate, calcium oxide, and calcium carbonate into materials with a particle size of not less than 250 mesh, according to the mass ratio of magnesium-based compounds (taken from one or more of magnesium oxide, magnesium chloride, and magnesium carbonate) ): Calcium-based compound (from one or more of calcium oxide and calcium carbonate): phosphate (from one or more of potassium dihydrogen phosphate, potassium monohydrogen phosphate, potassium phosphate, and sodium phosphate): sulfide ( One or more of potassium sulfide, sodium sulfide, ferrous sulfide, and ferrous disulfide) = 70:20:5:5, mixed evenly to obtain a solidified stabilizer.

[0049] (2) Take the contaminated soil of an arsenic smelter and add the solidification stabilizer prepared in the above (1) according to the weight ratio of 3%, and stir and mix the soil to be treated together with the solidification stabilizer spread on it by ...

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Abstract

The invention discloses preparation of a curing stabilizing agent for treating heavy metal-polluted soil and a use method thereof. The curing stabilizing agent includes basic components and special added components, wherein the basic components comprise 65-90% of a magnesium-base compound and 10-35% of a calcium-base compound and the special added components comprise a phosphide and a sulfide. The addition amount that the molar ratio of the special added components to the content of heavy metal in the polluted soil P:M=2-50:1. The curing stabilizing agent is prepared by uniformly mixing the basic components and the special added components according to the ratio. Compared with a curing stabilizing agent used in curing stabilizing treatment in the prior art, the curing stabilizing agent is wide in raw material source. The raw materials are easy to obtain. The curing stabilizing agent is easy to carry out, is excellent in use effect and is simple in use method, and has a popularizing value.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for preparing and using a solidification stabilizer for treating heavy metal polluted soil. Background technique [0002] Heavy metals generally refer to about 60 elements with a specific gravity above 4.0 or about 45 elements with a specific gravity above 5.0. Heavy metals in environmental pollution research mainly refer to elements with significant biological toxicity such as Pb, Cd, Hg, Cr, and metalloid As, and also include heavy metals such as Zn, Cu, Co, Ni, and Sn with certain toxicity. Some heavy metal elements are essential elements for the human body and other organisms, but their concentration exceeds a certain range will cause poisoning. [0003] Heavy metals are usually acutely or chronically toxic, and sometimes poison the human body in more complex ways, such as causing cancer or indirectly causing certain diseases. Among all kinds of ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/06B09C1/08A62D3/33A62D101/43
CPCC09K17/06A62D3/33A62D2101/43B09C1/08
Inventor 闫学昌
Owner 中咨国宜(北京)环境修复技术有限公司
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