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High efficiency stabilizing agent and method for combined contaminated soil with arsenic and manganese

A complex pollution and stabilization technology, applied in the restoration of polluted soil, chemical instruments and methods, soil conditioning materials, etc., to achieve the effect of promoting desorption, strengthening stabilization effect, and obvious effect

Active Publication Date: 2019-10-25
长沙工研院环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the technical problems existing in the prior art in the process of treating arsenic and manganese compound polluted soil, the purpose of the present invention is to provide a stabilizing agent that can efficiently stabilize manganese and arsenic in the soil at the same time. The source of raw materials for the agent is wide and the cost is low. Different components can also be selected for remediation of other heavy metal-contaminated soils, which can be applied on a large scale

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The polluted soil of a tailings pond in Chenzhou, Hunan Province was taken. The pH of the soil was 5.97, the content of arsenic was 1391.94 mg / kg, and the content of manganese was 6107.24 mg / kg. ) The measured leaching concentration of arsenic is 1.07mg / L, and the leaching concentration of manganese is 21.2mg / L.

[0064] (1) Crushing and sieving the polluted soil to a particle size ≤ 1cm to remove larger stones and other sundries;

[0065] (2) In the soil after sieving, add 20% clean common sand grains of polluted soil quality for construction, and mix and stir evenly;

[0066] (3) Then add 1% sodium silicate and 3% magnesium oxide of the polluted soil quality, stir and mix evenly, then add an appropriate amount of water to adjust the soil moisture content at about 30%, so that various reactions can be carried out better;

[0067] (4) Add 0.5% calcium peroxide and 0.5% potassium ferrate of polluted soil quality, stir and mix;

[0068] (5) add the ferrous sulfate of po...

Embodiment 2

[0071] Take the polluted soil of a smelter in Zhuzhou, Hunan, the pH of the soil is 6.65, the content of arsenic is 595.7mg / kg, the content of manganese is 2442.1mg / kg, the content of lead is 1331.1mg / kg, the content of cadmium is 52.6mg / kg, and the content of zinc is 2944 .mg / kg, the copper content is 802.8mg / kg. According to "Solid Waste Leaching Toxicity Leaching Method - Sulfuric Acid Nitric Acid Method" (HJ / T299-2007), the leaching concentration of arsenic is 0.38mg / L, the leaching concentration of manganese is 11.8mg / L, and the leaching concentration of lead is 1.12mg / L. L, the leaching concentration of cadmium is 0.85mg / L, the leaching concentration of zinc is 15.3mg / L, and the leaching concentration of copper is 0.58mg / L.

[0072] (1) Crushing and sieving the polluted soil to a particle size ≤ 1cm to remove larger stones and other sundries;

[0073] (2) In the soil after sieving, add 20% clean common sand grains of polluted soil quality for construction, and mix and s...

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Abstract

The invention discloses a high efficiency stabilizing agent and method for combined contaminated soil with arsenic and manganese. The high efficiency stabilizing agent includes silicate, magnesium oxide, an oxidant, and a ferric salt and / or a ferric salt. The high efficiency stabilizing agent can simultaneously and efficiently stabilize the manganese and the arsenic in the soil, the high efficiency stabilizing agent is wide in raw material source and low in cost, and can be widely promoted and applied.

Description

technical field [0001] The present invention relates to a high-efficiency stabilizing medicament for arsenic and manganese composite polluted soil, in particular to a medicament for reducing the mobility and bioavailability of manganese and arsenic in soil through chemical oxidation, adsorption and precipitation, and its anti-arsenic and arsenic The invention relates to a method for efficiently remediating manganese compound polluted soil, which belongs to the technical field of complex heavy metal polluted soil remediation. Background technique [0002] Most of the arsenic in nature is mixed in tin, lead, copper, zinc, gold and other metal ores in the form of sulfide. According to the survey, the proportion of symbiotic and associated arsenic ores in my country is as high as 87.1%. Therefore, there is a large amount of arsenic every year. Mined along with other minerals, due to the relatively backward beneficiation and smelting technology in history, the full utilization of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/12B09C1/08
CPCB09C1/08C09K17/12
Inventor 史学峰刘卫国邵乐李昌武韩凤
Owner 长沙工研院环保有限公司
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