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Stabilization restoration method for soil compositely polluted by arsenic, antimony and other heavy metals

A technology of compound pollution and restoration method, which is applied in the field of antimony and other heavy metal compound contaminated soil stabilization and restoration, and arsenic field, which can solve the problems of unfavorable soil utilization, difficult acquisition, high extraction cost, etc., and achieve good stabilization restoration effect and good stabilization Restoration effect, benefit for subsequent use

Inactive Publication Date: 2017-12-01
GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the technical proposal titled "A Stabilizer for Arsenic Contaminated Soil and Method for Restoring Contaminated Soil" (CN201210491208.9), it is proposed to use montmorillonite, calcium oxide, magnesium carbonate, and iron filings to stabilize and restore arsenic. Calcium oxide in this formula has strong alkalinity, which can change the pH of the soil, which not only easily causes soil compaction, but also tends to burn seedlings and reduce the efficiency of phosphate fertilizers; the montmorillonite used is a component of bentonite mineral materials. If this ingredient is used alone, it needs to be extracted, the extraction cost is very high, and it needs to be roasted at 200-400°C for 1-2h, so this formula has the problem of high cost
In the invention patent titled "A Stabilizer for Soil Remediation of Arsenic Contaminated Sites" (CN201410189191.0), it is proposed to use bentonite, calcium sulfate, iron powder, and plant ash to restore arsenic pollution suddenly. The plant ash in the formula Plants need to be burned to obtain it. It is not easy to obtain and the cost is high. Incineration can easily cause secondary pollution. Plant ash is an alkaline material that can change the pH of the soil and is not suitable for neutral and alkaline soil restoration.
The invention patent titled "A Heavy Metal Stabilizer" (CN201510504522.X) proposes that the stabilizer formula is sodium-based bentonite, zeolite powder, mercapto-iron-based modified biochar, reduced iron powder, calcium oxide or calcium hydroxide , the sodium-based bentonite in this formula is rare, with few reserves in the world and high cost; the mercapto-iron-based modified biochar needs to be modified and prepared by high-temperature calcination, and the cost is high; Same problem as patent CN201210491208.9
In the invention patent titled "A method for stabilizing arsenic-alkali slag" (CN201410374883.2), it is proposed to add stabilizer iron salt, clay, and dilute acid solution to arsenic-alkali slag. This method adds dilute acid solution, if Used in soil, it will be strongly destructive to the soil, which is not conducive to the subsequent utilization of soil

Method used

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  • Stabilization restoration method for soil compositely polluted by arsenic, antimony and other heavy metals
  • Stabilization restoration method for soil compositely polluted by arsenic, antimony and other heavy metals
  • Stabilization restoration method for soil compositely polluted by arsenic, antimony and other heavy metals

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: add the bentonite that accounts for 2.4% of soil dry mass in the former soil (composite heavy metal polluted soil) of table 1, stir; Add a certain amount of water, make soil moisture rate 20%, stirring reaction 0.5h; Add ferric oxide accounting for 0.6% of the dry mass of the soil, stir evenly, then add a certain amount of water to make the soil moisture content 30%, and stir evenly; maintain the soil after adding the stabilizer for 14 days to achieve the goal of soil restoration. Purpose. According to the "Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007), the concentration of heavy metals in the leachate was used to investigate the effect of the stabilizer on remediating polluted soil. The test results are shown in Table 1.

[0030] Table 1 Leaching test results of contaminated soil

[0031]

Embodiment 2

[0032] Embodiment 2: Add straw charcoal accounting for 0.6% of soil dry mass in the original soil (composite heavy metal-contaminated soil) in Table 2, and stir evenly; add a certain amount of water to make the soil moisture content 20%, and stir for 0.5h; Then add ferric oxide accounting for 2.4% of the dry mass of the soil, stir evenly, then add a certain amount of water to make the soil moisture content 40%, and stir evenly; maintain the soil after adding the stabilizer for 7 days to achieve soil restoration the goal of. According to "Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007) The concentration of heavy metals in the leach solution was used to investigate the effect of the stabilizer on remediating polluted soil. The test results are shown in Table 2.

[0033] Table 2 Contaminated soil leaching test results

[0034]

Embodiment 3

[0035]Embodiment 3: add the straw charcoal that accounts for 0.6% of soil dry mass and the bentonite that accounts for 0.6% of soil dry mass in the former soil (composite heavy metal polluted soil) of table 3, stir; Add a certain amount of water, make soil moisture content to 20%, and stirred for 1 hour; then added ferric oxide accounting for 1.8% of the dry mass of the soil, stirred evenly, and then added a certain amount of water to make the soil moisture content 40%, and stirred evenly; Soil maintenance for 7 days is to achieve the purpose of soil restoration. According to the "Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007), the concentration of heavy metals in the leach solution was used to investigate the effect of the stabilizer on remediating polluted soil. The test results are shown in Table 3.

[0036] Table 3 Contaminated soil leaching test results

[0037]

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Abstract

The invention discloses a stabilization restoration method for soil compositely polluted by arsenic, antimony and other heavy metals. The method comprises the following steps that (1) bentonite and / or crop-residue-derived carbon are / is added into the heavy-metal-compositely-polluted soil and stirred evenly; (2) water is added into the soil, the moisture content of the soil is made to be 20%, and a stirring reaction is conducted for 0.5-2 h; (3) a certain amount of arsenic-antimony-polluted soil stabilizer is added and stirred evenly, water is added then, the moisture content of the soil is made to be 30%-50%, and even stirring is conducted; and (4) the soil where the stabilizer is added is cured for 3-30 d, and the purpose of soil restoration is achieved. A stabilizing material adopted by the method has the characteristics of being economical, effective, extensive in source, low in cost, high in stability, free of secondary pollution to soil, neutral, no change in polluted soil pH value and the like, the operation method is simple, high in practicability and wide in application range, and the method has the good stabilization restoration effect on the heavy-metal-compositely-polluted soil, especially on the soil compositely polluted by heavy metals of arsenic and antimony.

Description

technical field [0001] The invention relates to a method for remediating polluted soil, in particular to a method for stabilizing and remediating soil compounded with arsenic, antimony and other heavy metals. Background technique [0002] my country is the country with the most abundant antimony ore resources in the world, accounting for 66.2% of the world's total antimony reserves. It is also the world's largest antimony ore mining and production country, and my country's antimony ore basically contains a large amount of arsenic, which usually coexists. Antimony and arsenic belong to the same family of heavy metal polluting elements. Their properties are similar, and their separation is very difficult. Therefore, with the mining and smelting of antimony mines, the weathering and leaching of tailings, etc. It is often accompanied by high concentrations of antimony and arsenic. For example, the arsenic-alkali slag produced after antimony smelting contains about 10% of antimon...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 杨崎峰张德明覃晖周永信蒋林伶薛天利涂春艳
Owner GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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