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A method for efficient stabilization of mercury-containing waste residue

A stabilization and waste residue technology, applied to the removal of solid waste, etc., can solve the problems of not necessarily stabilizing mercury-containing waste residues, weakening bioavailability, and reducing mercury mobility, so as to achieve insensitive waste residue properties and improve the stabilization effect , Reduce the effect of migration and bioavailability

Active Publication Date: 2020-11-10
AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent (CN 105598145 A) discloses an in-situ remediation method for mercury-contaminated soil. The method uses biochar, calcium polysulfide and sodium selenite as passivators. It can effectively improve the soil microenvironment. In alkaline and highly reducing soil, the mobility of mercury is greatly reduced. Biochar with a strong specific surface, porous structure, and complex organic functional groups can absorb a large amount of mercury in the soil. Mercury; watering calcium polysulfide solution in the soil can further promote the mineralization of mercury. After planting crops, the microenvironmental bioactivity of the soil microenvironment in the roots is enhanced. Sodium selenite solution is applied to weaken its bioavailability by using the antagonistic effect of selenium and mercury
However, mercury-containing waste residues are mercury-enriched residues, which contain complex mercury components and high content. Generally, the agents and methods suitable for remediation of mercury-contaminated soil are not necessarily suitable for the stabilization of mercury-containing waste residues.

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 "Identification Standard for Hazardous Waste Leach Toxicity" (GB5085.3-2007), and this mercury-containing waste residue is hazardous waste. The slag sample was leached according to the Horizontal Oscillating Method of Toxic Leaching Method for Solid Waste Leaching (HJ557-2009), and the concentration of mercury in the leaching solution was 1.68mg / L, which exceeded the "Hazardous Waste Landfill Pollution Control Standard" (GB18598- 2001), the concentration limit allowed to enter the landfill is 0.25mg / L, and it needs to be stabilized and solidified to meet the entry standard.

[0052] (...

Embodiment 2

[0060] Get the same waste slag as in Example 1, and through the same crushing and screening process, add an appropriate amount of water in the waste slag to keep the waste slag moist, then add the configured oxidant (4% sodium persulfate solution into 5% HCl solution , the volume ratio is 1:10), the molar ratio of the active ingredient in the sodium persulfate to the mercury element in the waste residue is controlled to be not less than 2:1, stir evenly, heat for 20min (the temperature is controlled at 80 degrees Celsius), and the rest of the steps are carried out Example 1 is the same, after curing for 3 days, leaching is carried out according to "Solid Waste Leaching Toxicity Leaching Method Horizontal Oscillation Method" (HJ557-2009), the concentration of mercury in its leach solution is 0.13mg / L, which is higher than the value in Example 1, but can It meets the concentration limit of 0.25mg / L allowed to enter the landfill in the "Hazardous Waste Landfill Pollution Control S...

Embodiment 3

[0062] Get the same waste residue as in Example 1, and through the same crushing and screening process, add the same oxidizing agent as in Example 1 and carry out the same oxidation reaction, add 5% potassium sulfide solution, and the addition of potassium sulfide is the amount of sulfur element and waste residue The molar ratio of the mercury element in the medium is 2:1, stir evenly, react for 30 minutes, add ferrous chloride, the addition amount is 2% of the waste residue mass, stir evenly, react for 15 minutes; add bentonite, zeolite and humus The mass ratio is 1:1:1, the total addition is 10% of the waste slag quality, and it is evenly stirred; the next step of adjusting the pH is the same as in Example 1, and after 3 days of maintenance, follow the "Solid Waste Leaching Toxicity Leaching Method Horizontal Oscillation Method" (HJ557-2009) is leached, and the concentration of mercury in its leachate is 0.15mg / L, higher than the value in embodiment 1, but can satisfy " hazar...

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PUM

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Abstract

The invention discloses a method for mercury-containing waste slag efficient stabilization. The method comprises the following steps that (1) mercury-containing waste slag is crushed and subjected tosieving treatment, and sieved mercury slag fine particles are taken; (2) water is added in the mercury slag fine particles for moisturizing, then an oxidant solution is added, and stirring and heatingare conducted for an oxidation reaction; (3) a sulfidation salt solution is added in the mercury slag fine particles for a sulfidation reaction; (4) ferrous salt is added in the mercury slag fine particles to precipitate excessive S<2->; (5) clay mineral and humus are added in the mercury slag fine particles for adsorption; and (6) a pH adjusting agent is added in the mercury slag fine particlesto adjust the pH of mercury contaminated soil to be 6-7, and curing is conducted for 3 days or more. Through the method for mercury-containing waste slag efficient stabilization, stabilized solidification can be simultaneously conducted on multi-form mercury in the mercury-containing waste slag, the stabilizing effect is good, and the period is short; and agent raw materials adopted by the methodare wide in source and low in cost, and wide application is facilitated.

Description

technical field [0001] The invention relates to a method for treating heavy metal waste residue, in particular to a method for stabilizing mercury-containing waste residue, and belongs to the technical field of heavy metal waste residue 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 Hazardous Waste List" has listed mercury-containing waste as HW29 hazardous waste. Mercury-containing waste mainly refers to mercury-containing solid waste produced by 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 body through the foo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B5/00
Inventor 邵乐史学峰韩凤李昌武刘晓月
Owner AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD