| 摘要 |
<p>1474944 Recovering metal values G THORSEN 29 May 1974 23792/74 Heading C1A A process for the extraction and separation of metals from a solid raw material, e.g. oxidic ores or alloy scrap, comprised (1) leaching the solid with an organic phase consisting of a solution of carboxylic acid(s) and/or alkyl phosphoric acid(s); (2) separating residual solids from the organic phase containing organometallic complexes; (3) contacting the organic phase with an aqueous metal salt solution in liquidliquid exchange whereby a less basic metal is extracted from the aqueous phase into the organic phase and complexed therein, while a more basic metal passes from the organic phase into the aqueous salt solution; (4) contacting the exchanged organic phase with a mineral acid or gas to strip the less basic metal theregrom. The aqueous metal salt solution may be obtained by (a) leaching the solid residue from step (1) with mineral acid, or (b) leaching the initial raw material with mineral acid, or (c) utilizing an outside source, e.g. waste mine water or pickle liquor. In one embodiment Fe-containing calcined ZnS ore is leached to provide an organo-Zn complex solution which is thereafter used to remove (by liquid-liquid exchange) iron from an aqueous iron and zinc sulphate solution, the iron then being stripped from the resulting organo-Fe complex solution. In another embodiment in which Cu, Zn and Fe are recovered as sulphates from mine water solid CaO is added to a recycled ZnSO 4 solution to form a starting material which is leached with the organic phase to provide an organo- Zn complex solution. This is exchanged with the mine water in stages to produce separate organo-Fe and organo-Cu complex solutions which are then stripped with H 2 SO 4 .</p> |
