Patent ID: 9279168
Filing Date: 2016-03-08
CPC Classification: C01C,C01G,C22B,Y02P,Y02W

Claim Text:
1. A process for recovery of technical grade molybdenum from diluted leaching acid solutions (PLS) containing highly concentrated arsenic, from metallurgical residues, wherein the process comprises the steps of: (a) contacting a pre-filtered acid leaching solution (PLS), from leaching of casting powders, with an anionic ion exchange resin to produce a charged ion exchange resin; (b) washing the charged ion exchange resin of step (a) with water; (c) extracting molybdenum from the washed ion exchange resin using an alkaline regenerating ammonium solution having a pH value between 8 and 12, to form ammonium molybdate in solution, which is recycled for adjusting molybdenum concentration; (d) washing the resin of step (c) with water; (e) adding magnesium and/or iron salts to the ammonium molybdate solution recovered in step (c) to form a precipitate of Mg (f) adding sulfuric acid to the ammonium molybdate solution obtained in step (e) for precipitating molybdenum in the form of ammonium molybdate ((NH (g) separating the precipitate formed in step (f) by filtrating ammonium molybdate and recycling the obtained solution to the PLS solution of step (a); (h) calcining the precipitate separated in step (g) to obtain molybdenum trioxide (MoO (i) recovering ammonia produced in step (h) for returning to the process as recycled regenerating solution.