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A stable solidification method for mercury-containing waste

A solidification method and waste technology, which are applied in the fields of radioactive purification, solid waste management, sustainable waste treatment, etc., can solve the problems of high and low chemical dissociation constant, insufficient cohesion of the conjugate, etc., and achieve simple and cost-effective treatment methods. low cost effect

Active Publication Date: 2019-12-03
HUNAN HENGKAI ENVIRONMENT TECH INVESTMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current method of waste treatment is to solidify the waste by mixing it with various cementitious materials. The disadvantages include that the liquid waste or sludge-type waste cannot be fully solidified, or the relevant cementitious materials do not show a significant hardening effect.
For example, using water glass or Portland cement alone to solidify the waste, forming a solid product with high permeability, porous, easy to leach and low mechanical strength, or because the cohesiveness of the combination is insufficient or the chemical dissociation constant is too high. High, resulting in the phenomenon of redissolution during the leaching test, but failed to meet the strict leaching test standards for reuse or landfill

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] With 100 grams of residue waste containing 30wt% solid particles (the leaching concentration of mercury is 0.6mg / L), its pH value is adjusted to about 7-8, and then with 50 grams of slag-Portland cement, add to the mixed slurry 5 grams of sodium sulfide solution with a mass fraction of 20%, and then 2 grams of a polyacrylamide solution with a mass fraction of 0.03wt%, were mixed and reacted to obtain a reactant, and the resulting reactant was poured into a mold and cured for 12 hours to obtain a cured The product, the obtained cured product is determined by "Solid Waste Leaching Toxic Leaching Method Sulfuric Acid Nitric Acid Method" HJ / T299-2007, "Solid Waste Leaching Toxic Leaching Method Horizontal Oscillating Method" HJ557-2009 The leaching concentration of mercury, in the leaching experiment, the leaching of mercury The concentration is not detected; the solidification rate reaches 100%, which is lower than the maximum allowable discharge concentration of 0.05mg / L s...

Embodiment 2

[0030] Adjust the pH value of 100 grams of dry soil (the leaching concentration of mercury is 0.4mg / L) to 7-8, then mix it with 30 grams of slag-Portland cement, and then add 40 grams of clear water to mix evenly to form a mixed slurry , adding 3 grams of mass fraction to the mixed slurry is 10% sodium sulfide solution, and then adding 2 grams of acrylamide solution with a mass fraction of 0.03wt% to mix and react to obtain a reactant, pour the resulting reactant into a mold, and solidify After 20 hours, the cured product was obtained, and the obtained cured product was determined by "Solid Waste Leaching Toxic Leaching Method Sulfuric Acid Nitric Acid Method" HJ / T299-2007, "Solid Waste Leaching Toxic Leaching Method Horizontal Oscillating Method" HJ557-2009 to determine the leaching concentration of mercury, and the leaching experiment Among them, the leaching concentration of mercury is 0.02mg / L; the solidification rate reaches 95%, which is lower than the maximum allowable d...

Embodiment 3

[0032] 100 grams of dry soil (the leaching concentration of mercury is 0.38mg / l) is adjusted to its pH value to 7-8, then mixed with 10 grams of slag-Portland cement, then added 50 grams of clear water and mixed evenly to form a mixed slurry, Add 2 grams of 20% sodium sulfide solution to the mixed slurry, then add 2 grams of 0.01wt% acrylamide solution to mix and react to obtain a reactant, pour the resulting reactant into a mold, and solidify After 20 hours (specific time), the cured product was obtained, and the obtained cured product was passed through "Solid Waste Leaching Toxic Leaching Method Sulfuric Acid Nitric Acid Method" HJ / T299-2007, "Solid Waste Leaching Toxic Leaching Method Horizontal Oscillation Method" HJ557-2009 Measure the leaching concentration of mercury. In the leaching experiment, the leaching concentration of mercury is 0.035mg / L; the solidification rate reaches 91%, which is lower than the maximum allowable discharge concentration of 0.05mg / L stipulated...

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Abstract

The invention belongs to the technical field of environmental protection, and particularly relates to a curing treatment method for mercury-containing wastes. The method comprises the following steps:grinding the mercury-containing wastes, adjusting the pH value to 6 to 9, adding a cementing material for uniform mixing to form mixed slurry, controlling the mass percent of free liquid in the mixedslurry at 20 to 50 weight percent, adding a sulfide solution and a polyacrylamide solution in sequence into the mixed slurry, performing reaction to obtain a reactant, placing the reactant into a mold, and curing the reactant for 10 to 20 hours to obtain a cured product. The treatment method disclosed by the invention is simple and low in cost, and the curing rate is up to 90 percent or above.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a stable solidification treatment method for mercury-containing waste. Background technique [0002] Today, the domestic industry faces the possibility that various wastes that have been produced and are being produced by various industries may be being produced, or have been produced and dumped in some pits or underground, which may pollute groundwater, river water or lake water. Causes biological acute or chronic toxicity, and finally enters and accumulates in the human body through the biological chain, causing human poisoning, disease or cancer. The National Environmental Protection Agency has promulgated regulations that waste or waste liquid containing heavy metal mercury can be stabilized or solidified, and after the leaching test reaches a certain standard, it can be further reused or buried. [0003] The current method of waste treatment is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/08C04B18/04G21F9/16G21F9/30
CPCC04B18/0472C04B28/08C04B2111/00767G21F9/16G21F9/301C04B22/14C04B24/2652C04B22/002Y02W30/91
Inventor 蒋燚彭芙蓉苗进辉张赛辉张练军
Owner HUNAN HENGKAI ENVIRONMENT TECH INVESTMENT CO LTD
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