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Immobilizing and stabilizing agent for arsenic-contaminated soil and application thereof

A stabilizer and arsenic-contaminated technology, which is applied in the field of curing stabilizers, can solve the problems of difficult preparation, high cost of curing stabilizers, and low remediation efficiency of high-arsenic-contaminated soil, and achieve the effect of simple components and convenient preparation

Active Publication Date: 2015-07-15
YONKER ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem solved by the present invention is that the solidification stabilizer used for arsenic-contaminated soil has high cost and is difficult to prepare, and the restoration efficiency of high-arsenic-contaminated soil is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Treatment of arsenic-contaminated soil: In order to prevent interference caused by arsenic slag particles intruding into the soil layer, the arsenic soil in the lower layer was taken as the test soil. After the soil is air-dried and impurities removed, it is ground through a 20-mesh nylon sieve, mixed well, and set aside. After detection and determination, the total arsenic content in the soil is about 13000mg / kg, and the total arsenic content in the leachate is about 70.59mg / L when detected by TCLP method.

[0020] (2) Add curing stabilizer: accurately weigh 2kg of test soil, add 100g of prepared grinding and mixing solidifying stabilizer (ferric sulfate 40g, aluminum sulfate 30g, potassium permanganate 5g, calcium carbonate 25g), fully After mixing and stirring, add 0.5L of water and cover with a film to keep it moist.

[0021] (3) Curing test: After 3 days of curing, take the repaired soil, and use the TCLP method to detect the total arsenic content in the leach...

Embodiment 2

[0025] (1) The treatment of arsenic-contaminated soil is exactly the same as that in Example 1.

[0026] (2) Add curing stabilizer: Add 1.25L of water to 5kg of high-arsenic soil, and then add 25g of finely ground and mixed curing stabilizer (including 10g of iron sulfate, 7.5g of aluminum sulfate, 1.25g of permanganate, calcium carbonate 6.25g), after fully mixing and stirring, cover with a film to moisturize.

[0027] (3) Curing test: After 3 days of curing, take the repaired soil, and then use the TCLP method to detect the arsenic content in the leachate, and the results are shown in Table 2 below.

[0028] Table 2 Comparison of the effect before and after repairing with curing stabilizer

[0029]

Embodiment 3

[0031] (1) The treatment of arsenic-contaminated soil is exactly the same as that in Example 1.

[0032] (2) Add curing stabilizer: Add 0.9L of water to 3kg of high-arsenic soil, and then add 30g of finely ground and mixed curing stabilizer (including 12.5g of iron sulfate, 7.5g of aluminum sulfate, 1.25g of permanganate, carbonic acid Calcium 8.75g), after fully mixing and stirring, cover with a film to moisturize.

[0033] (3) Curing test: After 3 days of curing, take the repaired soil, and use the TCLP method to detect the total arsenic content in the leachate, and the results are shown in Table 3 below.

[0034] Table 3 Comparison of the effect before and after repairing with curing stabilizer

[0035]

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PUM

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Abstract

The invention relates to an immobilizing and stabilizing agent for arsenic-contaminated soil and application thereof. The immobilizing and stabilizing agent comprises, by weight, 20 to 50 parts of a ferric salt, 30 to 40 parts of an aluminum salt, 5 to 10 parts of permanganate and 10 to 20 parts of calcium carbonate. The application of the immobilizing and stabilizing agent to arsenic-contaminated soil comprises the following steps: adding, by weight, 0.1 to 5 parts of the immobilizing and stabilizing agent and 20 to 30 parts of water into each 100 parts of the arsenic-contaminated soil; and carrying out uniform mixing under stirring and then carrying out standing and maintenance for more than 3 d. The immobilizing and stabilizing agent has simple composition, is convenient to prepare and is especially applicable to soil contaminated by high-concentration arsenic.

Description

technical field [0001] The invention relates to a curing stabilizer for arsenic polluted soil and its application. Background technique [0002] Arsenic is widely distributed in nature. The world's arsenic reserves are about 2 million tons. Among the proven arsenic resources, China accounts for 70%, ranking first in the world. It is mainly distributed in Guangxi, Yunnan and Hunan provinces. Arsenic compounds are highly toxic to organisms. The toxicity of trivalent arsenic compounds is stronger than that of pentavalent arsenic. Among them, poisoning by arsenic trioxide (commonly known as arsenic), which is more toxic, is the most common poisoning. Arsenic compounds can also be poisoned through skin or wound absorption. . [0003] Located in Heshan Village, Shimen County, Hunan Province, the realgar mine has a history of more than 1,500 years and is the largest realgar mine in Asia. From 1956 to 1978, the realgar mine was mined and produced arsenic, and the three wastes were...

Claims

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Application Information

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IPC IPC(8): C09K17/08B09C1/08
CPCB09C1/08C09K17/08
Inventor 贺前锋陈四海刘代欢刘畅周虹陈宪刘烨煊
Owner YONKER ENVIRONMENTAL PROTECTION
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