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Method for treating mercury-containing hazardous waste slag by combining low-temperature thermal desorption with chemical leaching

A chemical leaching and low-temperature heating technology, applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc. The effect of reducing the cost of chemical use, improving the leaching efficiency and effective treatment

Active Publication Date: 2017-12-01
AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the defects existing in the method for mercury removal of mercury-containing hazardous waste residues in the prior art, the purpose of the present invention is to provide a combination of thermal decomposition technology and chemical rinsing technology to realize the various forms of mercury in mercury-containing hazardous waste residues. High-efficiency removal, low mercury residue, low energy consumption, and low-cost method for treating mercury-containing hazardous waste residues. After demercuration by this method, the removal rate of mercury in mercury-containing waste residues can reach more than 95%, which solves the heat treatment of general mercury. Problems of high energy consumption and low washing efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The waste slag left over from the smelting of a mercury mine in Tongren, Guizhou was taken. The mercury content in the waste slag was as high as 1150mg / kg. The slag sample was leached according to the "Solid Waste Leaching Toxic Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007). The concentration of mercury is 3.25mg / L, which exceeds the concentration limit of 0.1mg / L in the Waste Identification Standard Leaching Toxicity Identification (GB5085.3-2007), and this mercury-containing hazardous waste residue is waste.

[0047] The waste residue is air-dried and crushed for later use. Configure each eluent separately, wherein the concentration of citric acid in the mixed eluent of citric acid, potassium iodide and calcium chloride is 1mol / L, the concentration of potassium iodide is 0.1mol / L, and the concentration of calcium chloride is 0.3mol / L; sodium sulfide The mass percent concentration of sodium sulfide in the eluent mixed with sodium hydroxide is 5%, and...

Embodiment 2

[0055] Take the same waste residue as in Example 1, and undergo the same air-drying and crushing treatment, and prepare the same eluents as in Example 1 respectively. Weigh 500 g of the pretreated waste residue and put it into a heat treatment device, and heat treatment is performed under the conditions of setting the treatment temperature at 350° C. and the treatment time at 20, 30, 40, 50, and 60 minutes, respectively. After the heat-treated waste residue was cooled to normal temperature, the same leaching treatment as in Example 1 was carried out. After air-drying, the mercury content in the waste residue was determined to be 42.33mg / kg, 28.92mg / kg, 25.67mg / kg, 21.76mg / kg, and 20.58mg respectively. / kg, the mercury removal rates were 96.32%, 97.49%, 97.77%, 98.1%, 98.21%. According to "Solid Waste Leaching Toxic Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007), the waste residue after mercury removal treatment is leached, and the concentration of mercury in ...

Embodiment 3

[0057] Take the same waste residue as in Example 1, and undergo the same air-drying and crushing treatment, and prepare the same eluents as in Example 1 respectively. Weigh 500 g of the pretreated waste residue and put it into a heat treatment device, and heat treatment is performed under the conditions of setting the treatment time to 30 minutes and the treatment temperatures at 200, 250, 300, 350, and 400° C. respectively. After the heat-treated waste residue was cooled to normal temperature, the same leaching treatment as in Example 1 was carried out. After the air-drying treatment, the mercury content in the waste residue was measured to be 69.52mg / kg, 52.87mg / kg, 37.17mg / kg, 28.92mg / kg, and 18.28mg respectively. / kg, the mercury removal rates were 93.95%, 95.4%, 96.77%, 97.49%, 98.41%. According to "Solid Waste Leaching Toxic Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007), the waste residue after mercury removal treatment is leached, and the concentratio...

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Abstract

The invention discloses a method for treating mercury-containing hazardous waste slag by combining low-temperature thermal desorption with chemical leaching. The method comprises the steps that firstly, low-temperature thermal desorption treatment is conducted on the mercury-containing hazardous waste slag to remove organic combined-form mercury and part of low-boiling-point inorganic combined-form mercury in the mercury-containing hazardous waste slag; secondly, leaching is conducted by adopting mixed liquid containing organic acid, iodate and chlorine salt to remove high-boiling-point mercuric oxide-form mercury; and lastly, leaching is conducted by adopting mixed liquid containing sodium sulfide and sodium hydroxide to remove high-boiling-point mercuric sulfide-form mercury. According to the method, multi-form mercury in the mercury-containing hazardous waste slag can be efficiently removed, the mercury residue content is low, the mercury-containing hazardous waste slag can be changed into general waste, the hazardous waste treatment cost is greatly reduced, and the condition that secondary pollution is caused to the environment is avoided.

Description

technical field [0001] The invention relates to a treatment method for mercury-containing hazardous waste residue, in particular to a method for treating mercury-containing hazardous waste residue through low-temperature thermal desorption combined with leaching, and belongs to the technical field of solid waste treatment. Background technique [0002] In recent years, with the rapid development of industry and agriculture, a large amount of mercury has been released in the process of production and use, and the "National Waste List" has listed mercury-containing waste as HW29 waste. Mercury-containing hazardous waste mainly refers to mercury-containing solid waste produced in mercury mining and smelting, chlor-alkali industry, battery and thermometer manufacturing and other industries. These mercury-containing wastes have high mercury content. If they are not disposed of properly, they will pollute the atmosphere, surrounding soil, surface water and groundwater. Mercury and...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00B09B3/40
Inventor 邵乐史学峰韩凤刘晓月
Owner AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
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