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Method for extracting copper-containing cyanided waste liquid by solvent to recycle copper

A waste liquid recovery and extraction technology, applied in metal cyanide, extraction water/sewage treatment, process efficiency improvement, etc., can solve the problems affecting gold cyanide leaching, equipment acid etching process, and inability to recover cyanide.

Inactive Publication Date: 2017-01-25
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because this method reduces the treatment capacity, the acid consumption is small, but the recovery of cyanide still adopts the method of acidification-alkali absorption, and the problems of acid corrosion of equipment and complicated process still exist
The electrolysis method has been applied to cyanide-containing electroplating wastewater, but this method cannot recover cyanide, but can only recover metal elements in water, so it is only suitable for treating electroplating wastewater with high copper and high cyanide; when treating low-concentration wastewater, due to high power consumption, Therefore, there is no price advantage
[0004] For the production of gold mines, the best way to recover cyanide in wastewater is to return it directly, and the copper contained in the water will affect the cyanide leaching of gold; There are many unfavorable factors in copper wastewater, so it is particularly necessary to develop a rapid copper removal process from low-concentration copper-containing and cyanide-containing wastewater.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The experimental water sample was a manually prepared copper-containing cyanide solution with a copper content of 1g / L, a free cyanide concentration of 0.2%, and a pH of 12.6.

[0014] The ratio of extractant is Aliquat336 8g, sec-octanol 20ml, sulfonated kerosene 25ml, extraction O / A=1, the copper content in the raffinate is less than 0.01g / L, and the free cyanide concentration remains unchanged; after multiple extractions until extraction When the reagent reaches saturation, it adopts 10% sodium chloride and 0.1% sodium cyanide solution for stripping, stripping O / A=2, stripping liquid copper content of 14.8g / L, stripping rate reaching 87%, stripping liquid after Metal copper is obtained after electrolysis. After electrolysis, the solution continues to be used for back extraction without adverse effects.

[0015] A cyanide leaching experiment was carried out on a gold ore sample with the raffinate, and the gold leaching rate reached more than 97%. Compared with the newly pr...

Embodiment 2

[0017] The experimental water sample is wastewater produced by a gold enterprise, with a copper content of 2.14 g / L, a free cyanide concentration of 0.3%, and a pH of 13.2.

[0018] The ratio of extractant is Aliquat336 100g, secondary octanol 100ml, sulfonated kerosene 300ml, extraction O / A=1, the copper content in the raffinate is less than 0.01g / L, and the free cyanide concentration remains unchanged; after the extractant reaches saturation, Using 15% sodium chloride and 0.1% sodium cyanide solution for back extraction, the back extraction O / A=3, and the copper content of the back extraction solution is 25.2g / L. After the stripping solution is electrolyzed, metallic copper is obtained. After electrolysis, the solution continues to be used for stripping without adverse effects.

[0019] A cyanide leaching experiment was carried out on a gold mine with raffinate, and the leaching rate of gold reached over 97%. This method realized the recovery of cyanide.

Embodiment 3

[0021] The experimental water sample is wastewater produced by a gold enterprise, with a copper content of 0.79g / L, a free cyanide concentration of 0.14%, and a pH of 12.4.

[0022] The ratio of extractant is Aliquat336 150g, secondary octanol 150ml, sulfonated kerosene 350ml, extraction O / A=3, the copper content in the raffinate is less than 0.01g / L, and the free cyanide concentration remains unchanged; after the extractant reaches saturation, Using sodium chloride 10%, solution stripping, stripping O / A=2, stripping liquid copper content is 15.2g / L. After the stripping solution is electrolyzed, metallic copper is obtained. After electrolysis, the solution continues to be used for stripping without adverse effects.

[0023] A cyanide leaching experiment was carried out on a gold mine with raffinate, and the leaching rate of gold reached over 97%. This method realized the recovery of cyanide.

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Abstract

The invention discloses a method for extracting copper-containing cyanided waste liquid by a solvent to recycle copper. The method is characterized in that quaternary ammonium salt is used as an extracting agent, and a sodium chloride solution is used as a back washing agent; by extraction and back washing, enrichment of the copper in waste water is realized, and the treatment volume of the waste water is reduced; the copper can be recycled from high-concentration copper-containing back washing liquid in various ways; the method does not have the extraction effect on cyanides existing in a free state, so that an extracting solution can be directly returned to a cyanidation leaching procedure to recycle the cyanides.

Description

Technical field [0001] The invention belongs to the field of non-ferrous metal metallurgy and environmental protection, and belongs to a method for treating low-concentration copper-containing cyanide wastewater. Background technique [0002] At present, cyanide leaching is the main method of gold production and will still occupy an important position in the long term; however, with the gradual increase in mining efforts, high-quality gold mineral resources tend to be exhausted, and the development and utilization of low-grade associated gold minerals has become a lot of gold The development trend of production enterprises; gold extraction with all-slime cyanide carbon slurry method has the characteristics of simple process, low production cost and high gold recovery rate. It is currently a popular gold production process at home and abroad, and the process is adaptable to ore Strong, suitable for dealing with associated gold mines. [0003] Copper-bearing minerals are extremely c...

Claims

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Application Information

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IPC IPC(8): C22B7/00C25C1/12C01C3/08C02F1/26
CPCY02P10/20
Inventor 刘奎仁高腾跃韩庆陈建设孔亚鹏
Owner NORTHEASTERN UNIV
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