Recovery device for wastewater containing silver cyanide

Abstract

The invention discloses a recovery device for wastewater containing silver cyanide. The recovery device comprises a pretreatment system for wastewater containing silver cyanide, a first-stage membrane separation treatment system, a second-stage membrane separation treatment system and a conveying system which communicate with one another sequentially through a pipeline, wherein the first-stage membrane separation treatment system is connected with a silver recovery system through a pipeline, the pretreatment system for wastewater containing silver cyanide comprises a collection tank for wastewater containing silver cyanide, a raw water pump, a bag filter, an ultrafilter and a pretreatment water tank which communicate with one another sequentially through a pipeline, the first-stage membrane separation treatment system comprises a first-stage boosting pump, a first-stage fine filter, a first-stage high-pressure pump, a first-stage membrane separation device and a first-stage treatment water tank which communicate with one another sequentially through a pipeline, the conveying system comprises a recycling water tank and a conveying pump which communicate with each other sequentially through a pipeline, and the silver recovery system comprises a silver recovery treatment water tank, a silver recovery conveying pump and a silver recovery device. The recovery device has the advantages that the silver recovery ratio is high, and the operating cost is low.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a recycling device for cyanide-silver-containing wastewater. Background technique [0002] Cyanide is widely used as the best complexing agent in electroplating. Cyanide has a very high complexing ability, and can form complexes with zinc, cadmium, copper, silver, gold, etc. The cyanide electroplating solution composed of cyanide complexes has excellent performance. However, cyanide is highly toxic, and cyanide-containing wastewater mainly comes from industries such as electroplating or wet gold extraction. [0003] The silver-cyanide-containing wastewater after silver plating mainly adopts the two-stage cyanide breaking method of alkaline chlorination method, but this method of directly adopting the two-stage cyanide breaking method of alkaline chlorination method requires a relatively large amount of sodium hypochlorite or calcium hypochlorite. The operation cost of cyanid...

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Problems solved by technology

[0003] The silver-cyanide-containing wastewater after silver plating mainly adopts the two-stage cyanide breaking method of alkaline chlorination method, but this method of directly adopting the two-stage cyanide breaking method of alkaline chlorination method requires a relatively large amount of sodium hypochlorite or calcium hypochlorite. The operating cost of cyanide-containing wastewater treatment is high and the yield of silver recovery is low, resulting in metal waste and environmental pollution, so it is not suitable for large-scale industrialization

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