OXIDATION AND PASSIVATION OF SULFIDE ORES IN GOLD AND MOLYBDENUM HYDROMETALLURGY

1 Rasulova Sitorabonu
Co-authors:
1 Guro Vitaliy 1 Ibragimova Matluba 1 Safarov Edgorjon
Institution:
1 Institute of general & inorganic chemistry of Uzbekistan Academy of sciences, Tashkent, Uzbekistan, sitora_r91@mail.ru, vpguro@rambler.ru
Conference:
27th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 23rd - 25th 2018
Proceedings:
Proceedings 27th International Conference on Metallurgy and Materials
Pages:
1442-1447
ISBN:
978-80-87294-84-0
ISSN:
2694-9296
Published:
24th October 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
12 views / 5 downloads
Abstract

The ore raw materials of Au, Mo producing industry are predominantly sulphide. Technologies for their processing include the oxidation stage, for which chlorine, oxygen, ozone, nitric acid, Mn(IV), Fe(III), NaCiO are used. The nature of the oxidant and ligand of metal ions determines the kinetics of dissolution of minerals. Gravimetric, redox-measurements with gold-bearing ore and concentrate of the Kokpatas field and dissolution electrokinetics using a rotating disk electrode, with chalcopyrite-mineral of Cu-Mo ores of Almalyk field are conducted. Dissolution of sulfide mineral under the redox potential or its equal anodic polarization is represented by steps: - dissolution of the outer layer of the mineral; - diffusion of Cu(II), Fe(III) ions out its volume, - enrichment of the interphase boundary with sulfur (passivation). Electrokinetics measurements with chalcopyrite revealed a similarity of the processes of its reagent and anodic dissolutions in an acid medium: both were accompanied by passivation of the surface. For chalcopyrite the diffusion coefficient of Fe (III), Cu (II) ions in its solid state was calculated.

Keywords: Sulphide ores, chalcopyrite mineral, electrokinetics
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