Invention Grant
- Patent Title: Process for recovery of technical grade molybdenum from diluted leaching acid solutions (PLS), with highly concentrated arsenic, from metallurgical residues
- Patent Title (中): 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
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Application No.: US14240567Application Date: 2012-08-24
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Publication No.: US09279168B2Publication Date: 2016-03-08
- Inventor: Felipe Andrés Lagno Sanchez , Ricardo Fernando Sepúl Veda Letelier , Marcelo Gustavo Acuña Goycolea
- Applicant: Felipe Andrés Lagno Sanchez , Ricardo Fernando Sepúl Veda Letelier , Marcelo Gustavo Acuña Goycolea
- Applicant Address: CL
- Assignee: EcoMetales Ltd.
- Current Assignee: EcoMetales Ltd.
- Current Assignee Address: CL
- Agency: Merchant & Gould P.C.
- Priority: CL2095-2011 20110826
- International Application: PCT/IB2012/054308 WO 20120824
- International Announcement: WO2013/030741 WO 20130307
- Main IPC: C22B34/34
- IPC: C22B34/34 ; C01C1/02 ; C01G39/02 ; C01G39/00 ; C22B3/42

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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