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Hazardous mercury-containing waste residue all-wet high-efficiency demercuration method

An all-wet, waste residue technology, applied in the direction of protection devices against harmful chemicals, can solve the problems of low secondary pollution, high cost of treatment of mercury-containing hazardous waste residues, and achieve good results, improved leaching effect, and synergistic ability. strong effect

Active Publication Date: 2018-01-12
AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the defects existing in the methods for treating mercury-containing hazardous waste residues in the prior art, the purpose of the present invention is to provide a method that can realize efficient removal of mercury in various valence states in mercury-containing hazardous waste residues, and convert mercury-containing hazardous waste residues into general Waste and low secondary pollution to the environment, the method of treating mercury-containing hazardous waste residue, the mercury-containing hazardous waste residue after mercury removal greatly reduces the harm to the environment and human body and the cost of post-processing, and solves the problem of general mercury-containing hazardous waste residue treatment high cost problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 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.

[0052] After the waste residue is naturally air-dried, it is ground and passed through a 20-mesh sieve for later use. Configure the oxidizing agent and each leach solution respectively, wherein the oxidizing agent is that 4% potassium persulfate solution is added in 5% HCl solution, the volume ratio is 1:10, the concentration of thiosulfate solution is 0.1moL / L, and the concentration of citric acid is 1moL / L, the concentration of potassium iod...

Embodiment 2

[0062] Get the same mercury-containing dangerous waste residue as in Example 1, and through the same air-drying, grinding and sieving process, configure the oxidizing agent and each leachate respectively, wherein the oxidizing agent is that 4% sodium persulfate solution is added in 5% HCl solution , the volume ratio is 1:10, the concentration of ammonium thiosulfate in the leach solution is 0.1moL / L, the concentration of citric acid is 1moL / L, the concentration of sodium iodide is 0.1moL / L, the concentration of sodium sulfide is 5% by mass, and the concentration of sodium hydroxide is 5%. The addition amount of sodium sulfide is 1.5% of the amount of sodium sulfide. Weigh 5g of the pretreated waste residue in a 100mL centrifuge tube, and the next steps are the same as in Example 1. After air-drying, the mercury content in the waste residue is determined to be 79.56mg / kg, which is greatly reduced, and the leaching rate reaches 93.08%. It is leached according to the "Solid Waste...

Embodiment 3

[0064] Get the same mercury-containing substance as in Example 1, and through the same air-drying, grinding and sieving process, configure the oxidizing agent and each leachate respectively, wherein the oxidizing agent is that 4% potassium persulfate solution is added in 5% HCl solution, the volume The ratio is 1:10, the concentration of potassium thiosulfate in the leach solution is 0.1moL / L, the concentration of tartaric acid is 1moL / L, the concentration of potassium iodide is 0.1moL / L, the concentration of sodium sulfide is 5% by mass, and the amount of sodium hydroxide is sulfide 1.5% of sodium usage. Weigh 5g of the pretreated waste residue in a 100mL centrifuge tube, and the next steps are the same as in Example 1. After air-drying, the mercury content in the waste residue is determined to be 83.39mg / kg, which is greatly reduced, and the leaching rate reaches 92.75%. It is leached according to the "Solid Waste Leaching Toxicity Leaching Method Sulfuric Acid Nitric Acid M...

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PUM

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Abstract

The invention discloses a hazardous mercury-containing waste residue all-wet high-efficiency demercuration method. The method comprises the steps of conducting oxidation treatment on hazardous mercury-containing waste residues through an acid persulfate solution, and adjusting the pH of the hazardous mercury-containing waste residues to 7 or more; and conducting leaching through a thiosulfate solution, conducting leaching through an organic acid and iodine salt mixed solution and conducting leaching through a sodium sulfide and sodium hydroxide mixed solution. By means of the method, mercury in multiple valence states in the hazardous mercury-containing waste residues can be efficiently leached; the mercury residual rate is low; the hazardous mercury-containing waste residues can be changed into general waste; the hazardous waste treatment cost is greatly reduced; and secondary pollution 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 chemical leaching, and belongs to the technical field of 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 its compounds in the soil can enter the human...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/38A62D101/43
Inventor 邵乐史学峰韩凤刘晓月李昌武
Owner AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
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