Treatment of copper- and palladium-containing materials
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I work in the recycling of electronic waste, and due to limited resources, I can only use fully wet-process recycling methods. I’m now encountering a type of chip material that contains about 40% copper, around 30 grams per ton of palladium, as well as hundreds of grams per ton of gold. The current process involves crushing it into powder, then leaching the copper with sulfuric acid, followed by electrowinning of the copper solution. Gold extraction from residues using aqua regia. There are no issues with the recycling of copper and gold. The problem now is that when copper is leached using sulfuric acid (with a concentration of about 180 g/L), most of the palladium is also leached out. The copper leach solution typically contains 5–10 PPM of palladium, and during electrowinning this palladium ends up in the electroplated copper, making it impossible to recover it. Although the palladium content is only 30 g/t, its price is 140 yuan per gram, which means a value of 4,000 yuan per ton; it still has value for recycling. I wonder if anyone else has encountered this same problem – please offer some guidance!
Copper exists in the raw materials in its metallic form, right? If so, it’s difficult to dissolve copper without oxidation ； Does this provide a way to solve it?
One baking step is sufficient to solve the problem; by oxidizing palladium, it can no longer be leached out, and the palladium gets concentrated in the gold recovery residue! Re-reduction leaching
What is the capacity of your electrowinning system?
You can use new types of adsorbent materials; I have worked on recycling using such materials before, specifically for the recovery of palladium in chloride form from hydrogenation reactions. You can get in touch. QQ45966605.15250292838
Bro, you don’t believe in my method. Once you know it, I’m telling you that those of you who work on precious metal adsorption materials are going to lose your jobs.
Upstairs, I’m not unemployed yet! Not every company has the conditions to carry out baking! Electronic waste produces smoke when burned! OP, it’s very simple! Use the elution resins from Zhuoyi Precious Metals Technology – set up a few resin tanks, and it’s done in one step! Simple problems, simple solutions
How about electrolyzing the copper once more?