etching solution
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How exactly should copper be recovered electrolytically from acidic copper chloride etching solutions? ?
I do have a method. Do you have ammonia-based copper solutions there?
Reply to 2# Demon Emperor: I also want to know how to do this
At present, it seems that there are no very good methods for recycling acidic etching solutions; for such solutions, or those containing ferric chloride, iron sheets are often used for reduction to produce sponge copper. In the case of alkaline etching solutions, they are neutralized to yield copper sulfate suitable for use as feed. In some cases, the substance is precipitated using alkalis, then dissolved with acids before being extracted and electrodeposited, although this process involves significant consumption of alkalis
Reply to 2# Demon Emperor: We only have acidic etching waste liquid here
Reply to 6# yang*anghui: I tried using iron powder with a purity of over 98% to replace copper, but how should the resulting sponge be dehydrated? Will heating cause it to oxidize easily in the air? ) Moreover, the sponge copper produced is quite prone to oxidation; it turns green after just a short while (when the sponge copper is formed without water removal). I would appreciate it if someone kind could help me out
Reply to 7# m010101: What is the moisture content of the sponge copper coming out of the system? Can’t it be dried naturally?
The copper powder obtained by suction filtration can be vacuum-dried after iron removal
1. If there is alkaline etching waste liquid (copper ammine solution), it can be neutralized to produce basic copper chloride; basic copper chloride then reacts with sulfuric acid to regenerate copper sulfate – this is the most effective and widely used method. 2. If wood is available, iron powder can be used for substitution to produce sponge copper. 3. Or extraction, but since the acidic etching waste liquid is highly acidic, it is difficult to handle it after back-extraction following extraction.
Reply to 8# yang*anghui: It can’t be dried naturally;; if left in the air, it quickly takes on another color (probably gray-green), which means it oxidizes in the air. Person on floor 8 mentioned vacuum drying – I’m not sure how feasible that is, and what the cost of the equipment would be: L