Title:
PROCEDURE FOR OBTAINING SCORODITE WITH A HIGH ARSENIC CONTENT FROM ACIDIC SOLUTIONS WITH HIGH CONTENT OF SULFURIC ACID
Document Type and Number:
WIPO Patent Application WO/2020/136543
Kind Code:
A3
Abstract:
A technical problem that has not been solved, is that today there is no procedure by which a final residue containing scorodite stabilized with a high arsenic content, higher than 15 % from highly acidic solutions greater than 30 g/L of free acidity or pH below 1.0. The present invention provides a solution to this problem through a process that allows: the oxidation of trivalent arsenic and ferrous ion, simultaneous with neutralization of the acid solution to be treated, the precipitation of arsenic and oxidized ferric iron added in a molar ratio Fe:As determined at a defined pH, all of the above with a high efficiency of precipitation of arsenic as ferric arsenate or scorodite, obtaining a final residue stable in the long term, characterized by their higher content of arsenic in a lower volume compared with the procedures described in the state of the prior art.
Inventors:
ROMÁN ESPINOZA ENRIQUE ANSELMO (CL)
PEZOA CONTE RICARDO MIGUEL (CL)
ACUÑA GOYCOLEA MARCELO GUSTAVO (CL)
PEZOA CONTE RICARDO MIGUEL (CL)
ACUÑA GOYCOLEA MARCELO GUSTAVO (CL)
Application Number:
PCT/IB2019/061255
Publication Date:
December 03, 2020
Filing Date:
December 22, 2019
Export Citation:
Assignee:
ECOMETALES LTD (CL)
International Classes:
C22B3/12; C22B15/00; C22B3/44
Foreign References:
| US5114592A | 1992-05-19 | |||
| US20060133974A1 | 2006-06-22 | |||
| US20100226837A1 | 2010-09-09 | |||
| US20080233023A1 | 2008-09-25 | |||
| US20200198985A1 | 2020-06-25 |
Attorney, Agent or Firm:
MATTAR MARTÍNEZ, Ignacio (CL)
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