Safe disposal method for high-concentration arsenic residue

A disposal method and high-concentration technology, applied in the field of ecological environmental protection, can solve the problems of lack of safe disposal of high-concentration arsenic-containing waste residues, in-depth research, etc., and achieve the effect of large treatment capacity, good repair effect and short repair period

Active Publication Date: 2013-11-27
路域生态工程有限公司
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Problems solved by technology

[0008] However, at present, there are few successful engineering cases on the safe disposal of arsenic-containing waste residues at home ...

Method used

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  • Safe disposal method for high-concentration arsenic residue

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Embodiment 1

[0030] see figure 1 , discloses a flow chart of specific steps of the safety disposal method according to the present invention. The method can physically and chemically safely dispose of high-concentration arsenic-containing waste residues produced in the production process of industrial enterprises or left over from abandoned industrial enterprises. The method includes the following steps:

[0031] (1) Crushing and screening: crushing and screening high-concentration arsenic-containing waste residues.

[0032] (2) Oxidation treatment: add a certain proportion of oxidant to the high-concentration arsenic-containing waste residue, and then add a certain proportion of water to fully stir the mixture.

[0033] (3) Exchange adsorption process: add a certain proportion of desorbent to the high-concentration arsenic-containing waste residue, and fully stir and mix the mixture.

[0034] (4) Stabilization process: add a certain proportion of stabilizer, then add a certain proportio...

Embodiment 2

[0050] The following examples can enable those skilled in the art to understand the present invention more comprehensively, but do not limit the present invention in any way.

[0051] The total analysis of arsenic adopts the atomic fluorescence method of "Identification Standard for Hazardous Wastes_Toxic Substances Content Identification" (GB5085.6-2007), and the analysis method of toxic leaching test adopts "Solid Waste_Leaching Toxicity Leaching Method_Sulfuric Acid Nitric Acid Method" (HJ-T299- 2007) Appendix E: P32-34. The reference standard for product toxicity and leaching indicators is the "Hazardous Waste Landfill Pollution Control Standard" (GB18598-2001).

[0052] The specific implementation steps are shown in the figure below ( figure 1 ) shown.

[0053] (1) Crushing and screening: referring to the systematic sampling method in the "Technical Specifications for Industrial Solid Waste Sampling" (HJ-T20-1998), a certain arsenic production plant samples the industri...

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Abstract

The invention provides a safe disposal method for a high-concentration arsenic residue. According to the method, a waste residue containing arsenic is crushed and screened at first so as to improve full contact between a chemical added in the process of later treatment and the waste residue containing arsenic; oxidation treatment is carried out to allow As<3+> in an environment to be oxidized into As<5+>; a desorption agent is added to promote desorption of AsO4<3->, AsO3<3-> and AsO2<-> in the environment and entry of the AsO4<3->, AsO3<3-> and AsO2<-> into an environmental solute; a stabilization agent is added in the process of stabilization to allow free AsO4<3->, AsO3<3-> and AsO2<-> in the environment and elements in the stabilization agent to form stable precipitates; then a pH value is adjusted to ensure environmental conditions for existence of the stable precipitates; a curing agent is added in the process of curing to further limit relocation diffusion capability of pollutants in the environment; and oxidation and shaping are carried out to ensure long-term security of the residue. The safe disposal method provided by the invention can realize safe disposal of a waste residue containing high-concentration arsenic (less than 1.0*10<5> mg/kg) and has the characteristics of a good restoration effect, high stability, a short restoration period, a low fund level, simple operation, great treating capacity, engineerability on a large scale, etc.

Description

technical field [0001] The invention relates to the field of ecological environment protection, in particular to a method for safely disposing of industrial high-concentration arsenic-containing waste residue. Background technique [0002] With the beginning of industrialization and modernization, the scale of industrial production continues to expand, the widespread use of arsenic and the disorderly stacking and disposal of arsenic-containing waste residues lead to a large amount of soil arsenic pollution. At present, arsenic pollution has become a serious environmental problem. According to incomplete statistics, my country has nearly 20 million hectares of arsenic-contaminated land, involving 25 regions in 11 provinces; in Australia, there are more than 10,000 soil arsenic-contaminated sites; in the United States, about 6,804 tons of arsenic passed through pesticides from 1900 to 1980 form into the soil. The U.S. Environmental Protection Agency lists arsenic as one of th...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00
Inventor 卜庆国徐奥王新民
Owner 路域生态工程有限公司
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