Invention Grant
US09279168B2 Process for recovery of technical grade molybdenum from diluted leaching acid solutions (PLS), with highly concentrated arsenic, from metallurgical residues 有权
从冶金残渣中稀释的浸出酸溶液(PLS)回收工业级钼,具有高度浓缩的砷的工艺

Process for recovery of technical grade molybdenum from diluted leaching acid solutions (PLS), with highly concentrated arsenic, from metallurgical residues
Abstract:
A method for recovering technical-grade molybdenum from diluted acid leaching solutions (PLS) that have a high arsenic concentration is disclosed. The method includes: (a) contacting a pre-filtered PLS with an anionic ion-exchange resin; (b) washing the loaded resin with water; (c) extracting molybdenum from the resin with an alkaline ammonium regenerant solution to form ammonium molybdenum in solution; (d) washing the unloaded resin with water; (e) adding iron and/or magnesium salts to the recovered ammonia solution to obtain a precipitate which is transferred to the arsenic abatement step and a solution containing ammonium molybdate; (f) adding sulphuric acid to the arsenic-free ammonia solution to precipitate ammonium molybdate; (g) separating the precipitate by filtering the molybdate and re-circulating the solution obtained with the initial PLS; (h) calcining the separated precipitate to obtain ammonia and molybdenum trioxide; and (i) recovering the released ammonia for subsequent use as a recirculated regenerant solution.
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