Mercury pollution soil thermal desorption and mercury recovery method and integrated equipment

A mercury pollution and thermal desorption technology, applied in the restoration of contaminated soil, etc., can solve the problems of waste of resources, no mercury collection, etc., and achieve the effect of simple process, pollution problem solving and simple process

Inactive Publication Date: 2015-11-11
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently applied thermal desorption technology is mainly used to remove mercury in the soil. Considering the project cost, most of the tail gas is only adsorbed or directly discharged by activa

Method used

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  • Mercury pollution soil thermal desorption and mercury recovery method and integrated equipment
  • Mercury pollution soil thermal desorption and mercury recovery method and integrated equipment
  • Mercury pollution soil thermal desorption and mercury recovery method and integrated equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] The mercury-contaminated soil samples came from a chlor-alkali production enterprise in Yunnan Province. The heavy metal content in the samples is shown in Table 6. The mercury content in the sample soil exceeded the limit of 1.5mg / kg for the mercury content in the third-grade soil in the "Soil Environmental Quality Standard" (GB15618-1995).

[0068] Table 1 The content of heavy metals in soil mg / kg

[0069]

[0070] The mercury-contaminated soil thermal desorption and mercury recovery treatment are as follows.

[0071] (1) Break the mercury-contaminated soil, pass it through a 7-mesh sieve, and add FeCl with 1.5% of the soil mass 3 , add water and stir well to make a slurry.

[0072] (2) Prepare an acidic aqueous solution (pH=3.5) with hydrochloric acid, and adjust the pH of the mud to about 7.5.

[0073] (3) Put the mud in an environment of 20°C to air-dry naturally, and the air-drying time is 18 hours.

[0074] (4) Use a roller compactor to crush the air-dried...

Embodiment 2

[0079] Mercury-contaminated soil samples came from a PVC manufacturer in Inner Mongolia Autonomous Region, and the heavy metal contents in the samples are shown in Table 2. The mercury content in the sample soil exceeded the limit of 1.5mg / kg for the mercury content in the third-grade soil in the "Soil Environmental Quality Standard" (GB15618-1995).

[0080] Table 2 The content of heavy metals in soil mg / kg

[0081]

[0082] The mercury-contaminated soil thermal desorption and mercury recovery treatment are as follows.

[0083] (1) Crush the mercury-contaminated soil, pass it through a 7-mesh sieve, and add 0.5% FeCl to the soil mass 3 , add water and stir well to make a slurry.

[0084] (2) Prepare an acidic aqueous solution (pH=3) with hydrochloric acid, and adjust the pH of the mud to about 7.0.

[0085] (3) Put the mud in an environment of 20°C to air-dry naturally, and the air-drying time is 16 hours.

[0086] (4) Use a roller compactor to crush the air-dried soil,...

Embodiment 3

[0091] The mercury-contaminated soil samples came from a primary mercury production enterprise in Shaanxi, and the heavy metal contents in the samples are shown in Table 4. The mercury content in the sample soil exceeded the limit of 1.5mg / kg for the mercury content in the third-grade soil in the "Soil Environmental Quality Standard" (GB15618-1995).

[0092] Table 3 The content of heavy metals in soil mg / kg

[0093]

[0094] The mercury-contaminated soil thermal desorption and mercury recovery treatment are as follows.

[0095] (1) Break the mercury-contaminated soil, pass it through a 7-mesh sieve, and add FeCl with 1.5% of the soil mass 3 , add water and stir well to make a slurry.

[0096] (2) Prepare an acidic aqueous solution (pH=3) with hydrochloric acid, and adjust the pH of the mud to about 7.0.

[0097] (3) Place the mud in an environment of 20°C to air-dry naturally, and the air-drying time is 24 hours.

[0098] (4) Use a roller compactor to crush the air-drie...

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Abstract

Disclosed is a mercury pollution soil thermal desorption and mercury recovery method. The method comprises the steps that 1, chlorine salt is added, wherein after mercury pollution soil is broken and levigated, the chlorine salt is added, water is added for sufficient stirring to obtain slurry; according to the additive amount of the chlorine salt, the molar concentration of hydrolyzed chloride ions is higher than that of mercury in soil; 2, pH is adjusted, wherein the pH of the slurry is adjusted by means of an acid water solution to range from 6.5 to 7.5; 3, air drying is performed, wherein the slurry is naturally dried; 4, breaking is performed, wherein the naturally-dried slurry is broken, 5-mesh undersize fine soil is used as soil to be processed for follow-up processing; 5, thermal desorption is performed, wherein thermal desorption is performed on soil to be processed at the temperature of 150 DEG C to 300 DEG C, mercury is recycled under natural cooling, and soil obtained after thermal absorption is used for other purposes; and 6, mercury is recycled, wherein a mercury-contained compound obtained after thermal desorption is performed is recycled at room temperature. The invention further discloses integrated equipment for implementing the mercury pollution soil thermal desorption and mercury recovery method.

Description

technical field [0001] The invention belongs to soil remediation treatment technology, in particular to a mercury-contaminated soil heat desorption and mercury recovery method. [0002] The invention also relates to an integrated device for implementing the above method. [0003] Mercury-contaminated soil of different pollution levels can be repaired, and the mercury in the contaminated soil can be recovered at the same time. Background technique [0004] Asia is the most severely polluted region by mercury, and the situation of mercury-contaminated soil in my country is not optimistic. According to statistics, the area of ​​cultivated land polluted by mercury in my country has reached 3.2×10 4 hectares, the mercury that pollutes the environment is produced every year as high as 1.9×10 8 kg. According to existing domestic literature reports, the agricultural environment in my country's economically developed areas is deteriorating, and agricultural products are seriously...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 王琪李扬高兴保王兴润黄启飞
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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