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Arsenic passivator and application thereof

A technology of passivating agent and soil, applied in the direction of application, chemical instruments and methods, organic fertilizers, etc., can solve the problems of insufficient stability, high engineering cost, large dosage of chemicals, etc., to achieve improved passivation efficiency, simple engineering operation, fast-acting effect

Inactive Publication Date: 2018-05-29
芜湖格丰环保科技研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The current solidification / stabilization technologies for arsenic-contaminated soil treatment and arsenic-containing solid waste disposal mainly include cement solidification, organic polymer solidification, plastic material solidification, melt solidification, high-temperature fire solidification, calcium salt precipitation, iron salt precipitation, sulfide Precipitation, etc., the treatment effect is obvious, and engineering applications are common, but there are still problems such as large dosage of chemicals, insufficient stability, high engineering cost, and secondary pollution, which still need to be optimized and improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] An arsenic passivator, which is composed of agent A and agent B according to the mass ratio of 1:1. Agent A is obtained by uniformly mixing 50 parts of 120 mesh polyferric sulfate and 50 parts of 100 mesh ferrous sulfate through a dry powder mixer. It is obtained by uniformly mixing 23 parts of 80-mesh pyrolusite powder, 40 parts of 200-mesh calcium-based bentonite, and 37 parts of 200-mesh slaked lime through a dry powder mixer.

[0035] A kind of application of arsenic passivator:

[0036] Take 100g (dry basis) of arsenic-contaminated site soil that has been pre-passed through a 3mm sieve. According to the horizontal oscillation method for leaching toxicity of solid waste leaching (HJ 557-2010), the leaching concentration of arsenic in the soil measured is 0.014mg / L, and the soil pH If it is 8.5, put the soil in an extraction bottle, add arsenic passivation agents A and B, and mix well. The amount of A and B added is 1.5% of the soil mass. According to HJ 557-2010, c...

Embodiment 2

[0038] An arsenic passivator, which is composed of agent A and agent B according to the mass ratio of 1:1, agent A is composed of 40 parts of 80 mesh polyferric sulfate, 55 parts of 80 mesh ferrous sulfate, 5 parts of 80 mesh sodium humate through dry powder It is obtained by uniform mixing with a mixer. Agent B is obtained by uniformly mixing 30 parts of 120-mesh pyrolusite powder, 30 parts of 120-mesh calcium-based bentonite, and 40 parts of 200-mesh slaked lime through a dry powder mixer.

[0039] A kind of application of arsenic passivator:

[0040] Take 100g (dry basis) of arsenic-contaminated site soil that has been sieved through a 3mm sieve in advance. According to the horizontal oscillation method for leaching and toxicity of solid waste leaching methods (HJ 557-2010), the leaching concentration of arsenic in the soil measured is 0.271mg / L, and the soil pH 6.3, put it in an extraction bottle, add arsenic passivation agents A and B, mix well, the amount of A and B adde...

Embodiment 3

[0042] An arsenic passivator, which is composed of agent A and agent B according to the mass ratio of 1:1. Agent A is obtained by uniformly mixing 55 parts of 100 mesh polyferric sulfate and 45 parts of 80 mesh ferrous sulfate through a dry powder mixer. It is obtained by uniformly mixing 35 parts of 200-mesh pyrolusite powder, 35 parts of 200-mesh calcium-based bentonite, and 30 parts of 120-mesh slaked lime through a dry powder mixer.

[0043] A kind of application of arsenic passivator:

[0044]Take 100g (dry basis) of an arsenic-containing waste residue that has been sieved through a 9.5mm sieve in advance, and the arsenic leaching concentration of the waste residue measured according to the "Solid Waste Leaching Toxic Leaching Method Acetic Acid Buffer Solution Method" (HJ / T 300-2007) is 0.538mg / L , the pH of the waste residue is 10.2, put it in an extraction bottle, add arsenic passivation agents A and B, and mix well, the amount of A and B added is 1.5% of the waste res...

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Abstract

The invention provides an arsenic passivator and an application thereof. The arsenic passivator comprises an agent A and an agent B, wherein the agent A is prepared from raw materials in parts by weight as follows: 40-60 parts of polyferric sulfate, 45-65 parts of ferrous sulfate and 0-15 parts of sodium humate; the agent B is prepared from raw materials in parts by weight as follows: 20-35 partsof pyrolusite powder, 25-45 parts of calcium bentonite and 30-50 parts of slaked lime, and the agent A and the agent B of the arsenic passivator are used in a mass ratio being 1:1. Compared with the prior art, the arsenic passivator is applied to passivation treatment of arsenic in soil and solid waste, does not affect pH of a system basically, has the advantages of being low in reagent dosage, good in treatment effect, high in treatment stability and environmentally friendly, taking effect quickly, realizing simple and convenient engineering operation and the like, and is low in comprehensivecost and wide in applicable range.

Description

technical field [0001] The invention belongs to the technical field of soil arsenic pollution control and arsenic-containing solid waste disposal, and specifically relates to an arsenic passivator and its application. Background technique [0002] With the increasing development of arsenic-related industries such as metallurgy and chemical industry, the problem of arsenic pollution in soil and industrial waste residues has gradually intensified, threatening the living environment and human health. Efficient and stable treatment of arsenic-containing soil and waste residues is imminent. [0003] Common arsenic-contaminated soil and arsenic-containing solid waste treatment technologies include engineering remediation, physical and chemical remediation, biological remediation, and solidification and stabilization. [0004] Engineering remediation technologies mainly include borrowed soil, soil replacement, and deep plowing and plowing. Among them, borrowing soil and soil replac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08
Inventor 朱慧可范丽梅章文贵侍孟璐奉向东
Owner 芜湖格丰环保科技研究院有限公司
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