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Harmless treatment method for cyanide-containing waste residues

A harmless treatment and waste residue technology, applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc., can solve the problems of large dosage of chemicals, high disposal costs, high operation requirements, etc., to reduce the concentration of leaching , short disposal cycle, stable effect

Inactive Publication Date: 2017-02-15
云南大地绿坤环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN 104070052A discloses a treatment method for cyanide-containing waste residues. The cyanide-containing waste residues with high soluble salt content are processed through four steps of alkali adjustment, cyanide breaking, granulation, and drying and solidification. The removal rate of cyanide is high, but the treatment process Complicated, large amount of dosage
Patent CN 261716C discloses a treatment method for cyanide-containing waste salt slag. Medium-temperature burning oxidizes and decomposes cyanide in the waste slag, and the gas generated is passed into an incinerator for incineration. Cyanide waste residue, gas-solid reaction is difficult to completely oxidize all cyanide in the waste residue, the requirements for equipment anti-corrosion are high, and the disposal cost is high
Patent CN 1493537A discloses a treatment method for dicyandiamide waste residue. Alkaline oxidation or bleaching powder oxidation method removes cyanide in the waste residue. This method needs to adjust the pH in sections, and the operation requirements are high, and the problem of cyanide-containing waste residue is not completely solved. stabilization problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Taking the cyanide-containing waste residue of a chemical plant as the treatment object, the original leaching results: pH=4.35, total cyanide=158mg / L.

[0028] Utilize method of the present invention to process this cyanide-containing waste residue:

[0029] Stir the cyanide-containing waste residue and water according to the solid-to-liquid ratio of 1:0.7 to make a slurry, add lime, adjust the pH of the slurry to 13, and then add a cyanide-breaking agent according to 12% of the total weight of the waste residue, and the preparation ratio of the cyanide-breaking agent is hydrogen peroxide : Bleaching powder = 1:0.8 (m / m), stirring and reacting for 30 minutes; then adding polyiron according to 5% of the total weight of the waste residue, stirring and reacting for 10 minutes, then adding 15% cement to solidify, and curing the solidified body for 7 days.

[0030] The leaching result of solidified body: pH=10.5, total cyanide=2.33mg / L.

Embodiment 2

[0032] Taking the cyanide-containing waste residue of a chemical plant as the treatment object, the original leaching results: pH=5.67, total cyanide=26.3mg / L.

[0033] Utilize method of the present invention to process this cyanide-containing waste residue:

[0034] Stir the cyanide-containing waste residue and water according to the solid-to-liquid ratio of 1:0.5 to prepare a slurry, add lime, adjust the pH of the slurry to 10.5, and then add a cyanide-breaking agent according to 8% of the total weight of the waste residue. The ratio of the cyanide-breaking agent is hydrogen peroxide : Bleaching powder = 1:0.3 (m / m), stirring and reacting for 60 minutes; then adding polyiron according to 4% of the total weight of the waste residue, stirring and reacting for 5 minutes, then adding 15% cement to solidify, and curing the solidified body for 3 days.

[0035] Leach result of cured body: pH=8.88, total cyanide=0.05mg / L.

Embodiment 3

[0037] Taking the cyanide-containing waste residue of a chemical plant as the treatment object, the original leaching results: pH=5.02, total cyanide=77.5mg / L.

[0038] Utilize method of the present invention to process this cyanide-containing waste residue:

[0039] The cyanide-containing waste residue and water are stirred according to the solid-to-liquid ratio of 1:0.7 to prepare a slurry. Add lime to adjust the pH of the slurry to 11.5, and then add a cyanide-breaking agent according to 10% of the total weight of the waste residue. The ratio of the cyanide-breaking agent is hydrogen peroxide: Bleaching powder = 1:0.6 (m / m), stirring and reacting for 30 minutes; then adding polyiron according to 5% of the total weight of the waste residue, stirring and reacting for 10 minutes, then adding 15% cement for curing, and curing the cured body for 7 days.

[0040] The leaching results of solidified body: pH=9.18, total cyanide=1.06mg / L.

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PUM

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Abstract

The invention relates to a harmless treatment method for cyanide-containing waste residues, and belongs to the technical field of hazardous waste treatment. The harmless treatment method for the cyanide-containing waste residues includes the steps of 1, adding water into the cyanide-containing waste residues and stirring to form slurry; 2, adding solid alkalis into the slurry and enabling the slurry to have strong alkalinity; 3, adding cyanide breaking agents in the stirring process; and 4, adding stabilizers and continuously adding curing agents after uniform stirring. According to the method, the operation is carried out at normal pressure and normal temperature, the technology is simple, the industrialized operation effect is stable, the cost of adopted chemicals is low, the removal rate of cyanides is high, and the hazardous waste landfill threshold standard is met after solidified bodies are leached.

Description

technical field [0001] The invention belongs to the technical field of harmless treatment of hazardous waste, and in particular relates to a treatment method for waste residue containing cyanide. Background technique [0002] Cyanides are divided into easy-to-release cyanides (mainly sodium cyanide, potassium cyanide, cuprous cyanide), complex cyanides (mainly potassium ferricyanide, potassium ferrocyanide) and organic cyanides (mainly There are acetonitrile, propionitrile), most cyanides are highly toxic, and cyanides that are not highly toxic can release highly toxic hydrogen cyanide in air or under acidic conditions. The toxicity of cyanide to the human body is mainly due to hydrogen cyanide and cytochrome oxidase Fe in the blood. 2+ Combining, forming a strengthened ferric cytochrome oxidase and losing the function of transferring oxygen, causing the cells to die due to hypoxia and suffocation. [0003] At present, there are many documents on the treatment of cyanide-c...

Claims

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Application Information

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IPC IPC(8): B09B3/00
CPCB09B3/20
Inventor 任雪娇吴启模吕本儒尹砾珩张卫东李成跃关会会
Owner 云南大地绿坤环保科技有限公司
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