Method for removing stibarsen and other heavy metals in polluted site soil

A technology for polluted soil and heavy metals, applied in the restoration of polluted soil and other directions, can solve the problems of unfavorable technology promotion, difficult biodegradation, high price, etc., and achieve the effects of enhanced migration ability, reduced processing difficulty, and small structural damage ability.

Inactive Publication Date: 2018-01-19
GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Applying the technology of this invention, EDTA is an artificial chelating agent, which is expensive and difficult to be biodegrad

Method used

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  • Method for removing stibarsen and other heavy metals in polluted site soil
  • Method for removing stibarsen and other heavy metals in polluted site soil
  • Method for removing stibarsen and other heavy metals in polluted site soil

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preparation example Construction

[0026] (2) Preparation of composite leaching agent: Mix oxalic acid and tannic acid in a certain proportion to obtain a composite leaching agent; the concentration of oxalic acid is 0.1-0.5mol / L, and the concentration of tannic acid is 0.01-0.01mol / L L; The ratio of oxalic acid to tannic acid is 5:1.

[0027] (3) Composite eluent rinse: put the pretreated compound contaminated soil into a 150ml plastic bottle with an inner cover, add the composite eluent prepared in step (2) according to a certain liquid-solid ratio, turn over and oscillate for 2 -4h, rinsing times 1-2 times, high-speed centrifugation, so that solid-liquid separation;

[0028] (4) Ferric chloride solution leaching: according to a certain liquid-solid ratio, add 0.5mol / L ferric chloride solution to the complex contaminated soil of the site after rinsing in step (3), turn and shake for 2-4h, and the number of times of rinsing is 1~ 2 times, high-speed centrifugation to separate solid and liquid;

[0029] (5) W...

Embodiment 1

[0034] (1) Collect the surface soil of farmland near an antimony mine site in Guangxi, air-dry it naturally, and pass through a 10-mesh sieve after removing debris. The soil physical and chemical properties and heavy metal content are shown in Table 1.

[0035] Table 1 Soil physical and chemical properties and heavy metal content

[0036]

[0037] (2) Preparation of composite leaching agent: 0.1 mol / L oxalic acid and 0.05 mol / L tannic acid were prepared according to the volume ratio of oxalic acid: tannic acid = 5:1.

[0038] (3) Weigh 10g of the sieved soil into a 150ml plastic bottle, add 100ml of compound eluent for the first time, that is, the liquid-solid ratio is 10ml: 1g, place it in an overturning oscillator, under the condition of 30r / min Oscillation 2h;

[0039] (4) High-speed centrifugation, solid-liquid separation and pouring out the waste eluent, then add 100ml of compound eluent for the second time, that is, the liquid-solid ratio is 10ml: 1g, shake at 30r / m...

Embodiment 2

[0047] (1) Collect the surface soil of an antimony mine site in Guangxi, air-dry it naturally, and pass through a 10-mesh sieve after removing debris and stones. The physical and chemical properties and heavy metal content of the soil are shown in Table 3.

[0048] Table 2 Soil physical and chemical properties and heavy metal content

[0049]

[0050] (2) Preparation of composite leaching agent: 0.3 mol / L oxalic acid and 0.01 mol / L tannic acid were prepared according to the volume ratio of oxalic acid: tannic acid = 5:1.

[0051](3) Weigh 10g of the sieved soil into a 150ml plastic bottle, add 100ml of compound eluent for the first time, that is, the liquid-solid ratio is 10ml: 1g, place it in an overturning oscillator, under the condition of 30r / min Oscillation 2h;

[0052] (4) High-speed centrifugation, solid-liquid separation and pouring out the waste eluent, then add 100ml of compound eluent for the second time, that is, the liquid-solid ratio is 10ml: 1g, shake at 30...

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Abstract

The invention discloses a method for removing stibarsen and other heavy metals in polluted site soil. The method comprises the following steps: (1) pretreating the polluted site soil in the earlier stage; (2) mixing oxalic acid with tannic acid at a certain ratio, so as to prepare a compound eluting agent; (3) eluting the pretreated polluted site soil by adopting the compound eluting agent; (4) carrying out eluting by adopting a ferric chloride solution; and (5) carrying out washing by adopting clean water and carrying out solid-liquid separation, so as to obtain the remedied soil. By adoptionof the method disclosed by the invention, stibarsen can be quickly and efficiently separated from soil particles; lead, zinc, cadmium and other cations can be transferred from the solid phase to theliquid phase; heavy metal anions and cations can be separated from the soil particles in a targeted manner; the effect is remarkable and thorough; the capability of the method to destroy the soil structure is relatively low; the recycling and reproduction capabilities of soil are not influenced; and the method is particularly applicable to the polluted site soil subject to the compound pollution caused by various high-concentration heavy metal elements.

Description

technical field [0001] The invention belongs to the technical field of soil heavy metal restoration, and in particular relates to a method for removing arsenic, antimony and other heavy metal elements in the soil of a polluted site. Background technique [0002] In recent years, metallurgy, chemical industry and other industries have brought huge economic benefits to our country, but also brought many environmental problems, especially the problem of soil pollution has become increasingly prominent. Mining, beneficiation and smelting are one of the main ways to release heavy metals into the soil environment. Mining waste rocks and tailings release a large amount of heavy metals during surface oxidation and leaching, and migrate vertically downward to form secondary minerals, resulting in a large amount of heavy metal enrichment and polluting the underlying soil. During the smelting process, many metals migrate and settle into the soil through the atmosphere in the form of f...

Claims

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Application Information

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IPC IPC(8): B09C1/02
Inventor 宋海农周永信谢湉张德明黎秋君黄大厅蒋林伶
Owner GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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