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Method for recycling copper and cyanide in cyanide-containing wastewater by using emulsion liquid membrane

A technology of emulsion liquid film and cyanide wastewater, which is applied in the direction of chemical instruments and methods, water/sewage treatment, process efficiency improvement, etc. It can solve the problems of cyanide heavy metal precipitation that is difficult to fully meet the standards, cumbersome and complicated operation procedures, and difficult to achieve ideal results. , to achieve the effects of reducing reagent consumption costs, eliminating safety risks, and strong selectivity and applicability

Inactive Publication Date: 2015-05-13
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods are effective for treating simple wastewater containing free cyanide, but when there are other valuable metal elements such as copper in the ore, the destruction of cyanide and the precipitation of heavy metals are difficult to fully meet the standards
In response to the changes in the properties of cyanide-containing wastewater from gold mines in recent years, various recovery technologies and methods have been researched and developed at home and abroad, such as acidification precipitation and tertiary amine extraction, etc., but these methods usually have high production costs and cumbersome and complicated operating procedures. Potential safety hazards or problems that are difficult to achieve the desired effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 5mL Span-80, 6mL Lix7950, 2mL n-dodecyl alcohol, 2mL liquid paraffin and 85mL civil kerosene into the milk maker, stir at 500rpm for 5min; add 0.05mol / L sodium hydroxide solution at a speed of 10mL / min 100mL; make milk for 20min at a stirring speed of 4500rpm, and let the prepared white emulsion stand for 1h; measure 100mL of the emulsion and slowly add it to 100mL of cyanide-containing wastewater with a copper concentration of 20.18mg / L, and stir for 15min at a speed of 200rpm ; After the extraction is finished, it is measured that the copper removal rate in the cyanide-containing wastewater reaches more than 99.9%.

Embodiment 2

[0024] Add 5mL Span-80, 6mL Lix7950, 2mL n-dodecyl alcohol, 2mL liquid paraffin and 85mL civil kerosene into the milk maker, stir at 500rpm for 5min; add 100mL of 0.05mol / L sodium hydroxide solution at a speed of 10mL / min ; Stir milk making at 4500rpm speed for 20min, and leave the prepared white emulsion for 1h; measure 100mL of emulsion and slowly add it to 100mL of copper concentration in the cyanide-containing waste water of 48.09mg / L, stirring speed is 200rpm, stirring time It was 15 minutes; after the extraction, it was measured that the removal rate of copper in the cyanide-containing wastewater reached more than 99.9%.

Embodiment 3

[0026] Add 5mL Span-80, 6mL Lix7950, 2mL n-dodecyl alcohol, 2mL liquid paraffin and 85mL civil kerosene into the milk maker, stir at 500rpm for 5min; add 0.05mol / L sodium hydroxide solution at a speed of 10mL / min 100mL; Stir the milk at 4500rpm for 20min, and let the prepared white emulsion stand for 1h; Measure 100mL of the emulsion and slowly add it to 100mL of cyanide-containing wastewater with a copper concentration of 98.525mg / L, and the stirring speed is 200rpm, stirring The time is 15 minutes; after the extraction is finished, it is measured that the copper removal rate in the cyanide-containing wastewater reaches more than 95%.

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PUM

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Abstract

The invention discloses a method for recycling copper and cyanide in cyanide-containing wastewater by using an emulsion liquid membrane, and belongs to the technical field of sewage treatment. The method mainly comprises the following steps: dissolving a Span80 surfactant, a Lix7950 guanidine extraction agent, a n-dodecyl alcohol modifier and a paraffin additive in a certain ratio in a membrane solvent with kerosene, stirring to obtain oil phase, and adding an alkaline solution into the oil phase to prepare a water-in-oil type emulsion liquid membrane; dispersing the water-in-oil type emulsion liquid membrane into cyanide-containing wastewater in a certain ratio, stirring, and leaving to stand and separate, thereby obtaining emulsion membrane phase with enriched high-concentration copper-cyanide complex and wastewater of which the copper-cyanide complex is desorbed; further performing demulsification, thereby effectively recycling copper and cyanide. The method has the advantages of being high in permeability, large in specific surface area, relatively high in enrichment rate, selectivity and applicability, relatively low in cost and the like.

Description

technical field [0001] The invention belongs to the technical field of industrial sewage treatment, and in particular relates to a method for purifying and recovering copper and cyanide using an emulsion liquid membrane using an organic guanidine alkaline extractant as a flow carrier. Background technique [0002] The cyanide leaching process is still the most important gold extraction method. With the continuous mining of gold mines, there are fewer and fewer gold mines that are easy to handle. Complex polymetallic sulfide ore gold deposits have become relatively common mined gold mines, and copper-bearing gold ores are one of the major types. The content of heavy metal impurity minerals such as copper in this kind of gold mine is high and it is easy to dissolve in the cyanide solution. On the one hand, the consumption of cyanide increases, and the production cost rises sharply; There is still a large amount of impurity metal cyanide remaining in the tail liquid. If this ...

Claims

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Application Information

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IPC IPC(8): C02F1/26C02F1/44C02F1/58C25C1/12
CPCY02P10/20
Inventor 谢锋孙雨宋奎符岩畅永锋路殿坤王伟翟秀静
Owner NORTHEASTERN UNIV
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