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Methods for precipitating copper ions in industrial waste water were investigated to obtain a precipitate of low water content with high filtration rate. Such a precipitate is favorable for electrolytical metal recovery in which the sludge is supplied to the anode compartment of a diaphragm cell. With addition of alkali carbonate or alkali hydrogen carbonate to a copper sulfate solution, a bluish white precipitate was formed initially. This precipitate changed gradually (but in a short time on warming) to green crystalline Malachite Cu(OH) (CO3)0.5, characterized by outstanding filtration rate and low water content (20% or less, as filtrated). The electrolytic recovery of copper from Malachite is then technically easy and economical.
- 社団法人 表面技術協会の論文
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