Treatment of displaced slag
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After purifying cadmium with zinc sulfate, what is the common approach for dealing with zinc-cadmium slag? The cadmium content is too low while the zinc content is too high; how can the cadmium content be increased? How is zinc recycled?
Sulfuric acid leaching ---- Iron removal (potassium permanganate or hydrogen peroxide) ---- Cadmium sponge obtained by zinc powder displacement ---- Smelting to remove zinc/ reduction to crude cadmium ---- Distillation to obtain pure cadmium | | Copper slag, filtrate ---- Removal of iron, cobalt, cadmium, etc. to obtain zinc sulfate solution ---- Can be used as zinc sulfate heptahydrate or sent directly for electrolysis to produce electrolytic zinc
I think the main problem lies in your replacement process. It can be handled in two steps: first, remove cadmium from the cotton, and then carry out further removal of cadmium. The coarse cadmium-containing cotton can be compressed to produce crude cadmium, while the fine cadmium-containing cotton can be subjected to other replacement processes...
Can hot water rinsing or low-acid rinsing be used to reduce the zinc content and increase the cadmium content?
Is the cost of doing this too high? What should be the concentration control for sulfuric acid? What is used to remove iron and adjust pH?