Method for purifying and regenerating silver and palladium from silver-palladium-indium target waste

Abstract

The invention provides a method for purifying and regenerating silver and palladium from silver-palladium-indium target waste, and belongs to the field of metal separation and recovery. According to the method, vacuum distillation is carried out to melt the silver-palladium-indium target waste, indium is gasified, and remaining melt is a silver-palladium alloy. Compared with the prior art, acid leaching is not needed in the method, no waste acid or waste water is generated, the technology is simple, rapid and efficient, the equipment investment is low, the mass content of the indium in the obtained silver-palladium alloy can be reduced to be very low, the mass content can reach 30 ppm or below, the silver-palladium alloy can be continuously used for machining target materials such as silver-palladium-copper-germanium and silver-palladium-copper, in the whole process, the loss rate of the silver and the palladium is very low, and the loss rate can reach 0.6% or below.

Description

technical field [0001] The invention belongs to the field of metal separation and recovery, and in particular relates to a method for purifying and regenerating silver and palladium from waste silver, palladium and indium target materials. Background technique [0002] With the rapid development of the electronics industry, the precious metal silver palladium has high use value and economic value in the field of electronic components due to its excellent performance. However, rare and precious metal resources are relatively scarce, so the recovery and comprehensive utilization of rare and precious metals is particularly important. [0003] At present, the process methods for recovering silver palladium from silver palladium alloy in industry mainly include nitric acid dissolution - hydrochloric acid heavy silver - dichloro diammine subpalladium method purification - hydrazine hydrate reduction process recovery of silver palladium, aqua regia dissolution - palladium complexat...

AI Technical Summary

Problems solved by technology

However, after the silver-palladium alloy waste is dissolved with nitric acid, during the silver chloride precipitation process, the micron-sized silver chloride precipitates are easy to coat or entrain other precious metal ions, resulting in the loss of other precious metals, and the later stage requires multiple cleanings, Processes such as redissolution will generate a large amount of waste water, causing environmental pressure

In the process of electrolytic recovery of silver, multiple castings and electrolysis of the anode plate are also required, and the electrolysis of silver is not complete, and the precious metals in the anode slime rich in precious metals still need to be further recovered. The process is cumbersome, the recovery time is long, and the equipment requirements are high.