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Deep treatment method of gold hydrometallurgy cyanide-containing wastewater

A technology of hydrometallurgy and advanced treatment, applied in the field of metallurgy, can solve the problems of low recycling rate, high cost, long process flow, etc.

Inactive Publication Date: 2020-01-10
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method should be able to avoid the problems of long process flow, high cost and low reuse rate in the treatment of cyanide-containing wastewater by conventional technologies, and the problems that various heavy metals, COD, ammonia nitrogen and cyanide in the discharged wastewater are difficult to meet the standards.

Method used

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  • Deep treatment method of gold hydrometallurgy cyanide-containing wastewater

Examples

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Effect test

Embodiment 1

[0052] A method for advanced treatment of cyanide-containing wastewater from gold hydrometallurgy, the steps are as follows:

[0053] (1) Take the low-concentration cyanide-containing wastewater after the gold hydrometallurgy cyanide-containing wastewater is pretreated by the lime neutralization method, the total cyanide concentration is reduced to 10mg / L, the concentration of soluble salt is 65g / L, and the COD content is 650mg / L , the content of ammonia nitrogen is 70mg / L, and the content of heavy metal elements is 10mg / L; a composite precipitant is added to the wastewater, and the composite precipitant includes a chemical precipitant, an inorganic flocculant, an organic flocculant, and a chemical precipitant with a mass ratio of 1:1:0.01. The precipitant includes sodium sulfide and quicklime; the inorganic flocculant is aluminum sulfate; the organic flocculant is an organic polymer flocculant; the ratio of the quality of the composite precipitant to the volume of low-concentr...

Embodiment 2

[0058] A method for advanced treatment of cyanide-containing wastewater from gold hydrometallurgy, the steps are as follows:

[0059] (1) Treat gold hydrometallurgy cyanide-containing wastewater through SO 2- Low-concentration cyanide-containing wastewater after pretreatment by air method (total cyanide concentration is reduced to 0.5mg / L, soluble salt concentration is 90g / L, COD content is 300mg / L, ammonia nitrogen content is 30mg / L, heavy metal element content 100mg / L), the composite precipitant includes chemical precipitant, inorganic flocculant, organic flocculant and active aluminum with a mass ratio of 1:50:0.5, and the chemical precipitant includes ammonium sulfide and calcium hydroxide; The inorganic flocculant is ferric chloride; the organic flocculant is a microbial flocculant; the ratio of the quality of the composite precipitant to the volume of low-concentration cyanide-containing wastewater is 5.0 g / L, and the waste residue is filtered out after the precipitation...

Embodiment 3

[0064] A method for advanced treatment of cyanide-containing wastewater from gold hydrometallurgy, the steps are as follows:

[0065] (1) Low-concentration cyanide-containing wastewater (total cyanide 5mg / L, soluble salt concentration of 40g / L, COD content of 100mg / L) obtained after pretreatment of gold hydrometallurgy cyanide-containing wastewater by acidification volatilization-alkali absorption method L, the content of ammonia nitrogen is 120mg / L, and the content of heavy metal elements is 50mg / L) by adding a composite precipitant. The composite precipitant includes a chemical precipitant, an inorganic flocculant, an organic flocculant and an active Aluminum, chemical precipitants include ferrous sulfide and calcium carbide slag; inorganic flocculants are polyferric sulfate; organic flocculants are organic polymer flocculants and microbial flocculants; the ratio of the mass of composite precipitants to the volume of low-concentration cyanide-containing wastewater It is 2g / L...

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Abstract

The invention relates to a deep treatment method of gold hydrometallurgy cyanide-containing wastewater. The method comprises: (1) adding a composite precipitant into low-concentration cyanide-containing wastewater obtained after pretreatment of gold hydrometallurgy cyanide-containing wastewater, and filtering out the waste residue after a precipitation reaction to obtain a first filtrate, whereinthe low-concentration cyanide-containing wastewater comprises 40-120 g / L soluble inorganic salt, 10-100 mg / L heavy metal, 100-650 mg / L COD, 0.5-10 mg / L total cyanide and 30-120 mg / L ammonia nitrogen;(2) softening the first filtrate, and then filtering; (3) carrying out heterogeneous catalytic ozonation on the softened filtrate, and then filtering out the waste residue to obtain a second filtrate;and (4) desalting the second filtrate through multi-stage countercurrent electrodialysis, and recycling fresh water. According to the invention, deep purification and fresh water recycling are achieved through the synergistic effect of different processes, the water recycling rate reaches more than 94.6%, and the concentration multiple of the concentrated water reaches more than 3.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to an advanced treatment method for cyanide-containing wastewater in gold hydrometallurgy. Background technique [0002] The cyanide-containing wastewater of gold hydrometallurgy comes from the cyanide-containing barren solution of the cyanide gold extraction unit, and the CN in this wastewater - The concentration is about 1000mg / L, and it also contains a variety of heavy metals, COD and ammonia nitrogen. Generally, it is treated by acidizing blowing off + lye recovery cyanide process, but there are high energy consumption and CN - For the problem of high residual concentration, Fenton oxidation, carbide slag neutralization, SO 2 Oxidation of cyanide, electrocoagulation and vulcanizing agent precipitation, etc., make the treatment of cyanide-containing wastewater difficult and costly. After treatment by these technologies, cyanide-containing wastewater still contains a large a...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F103/16C02F101/18C02F101/16C02F101/20
CPCC02F1/001C02F1/444C02F1/4693C02F1/5236C02F1/54C02F1/56C02F1/58C02F1/586C02F1/62C02F1/725C02F1/78C02F3/34C02F5/00C02F9/00C02F2101/16C02F2101/18C02F2101/20C02F2103/16C02F2301/08C02F2305/02
Inventor 石绍渊曹宏斌李玉平刘晨明张曼曼
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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