| 摘要 |
<p>1364933 Recovery of molybdenum and rhenium values CONTINENTAL ORE CORP 26 Nov 1971 [2 Dec 1970] 54977/71 Heading C1A Mo and Re values are recovered from solutions in which they are present together, e.g. pregnant acid leach solutions, by a process comprising the steps of:-(a) extracting Mo and Re values from the solution with an anion exchange agent, e.g. a liquid tertiary amine or quaternary ammonium compound; (b) stripping the Mo and Re values from the exchange agent with a solution containing ammonium ions to form a strip solution containing the Mo as ammonium tetramolybdate and the Re as ammonium perrhenate; and (c) crystallizing Mo from the strip solution in (b) as ammonium tetramolybdate by acidification, e.g. with sulphuric acid. Subsequent process steps may comprise (d) separating the crystallized ammonium tetramolybdate from the mother liquor; (e) extracting Re and the remaining Mo values from the mother liquor of (d) with an anion exchange agent; (f) stripping Re and the remaining Mo values from the loaded anion exchange agent in (e) with sodium hydroxide; and (g) recovering Re values from the strip solution in (f) by extraction with pyridine. The Re-containing solution may be distilled to remove pyridine and Re recovered as heptasulphide or metal.</p> |
