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Cobalt behavior during natural and technogenic oxidative leaching of Co-containing pyrites (Letnee chalcopyrite deposit, southern Urals)

O. L. Gaskova, E. V. Belogub and D. V. Makarov
Cobalt behavior during natural and technogenic oxidative leaching of Co-containing pyrites (Letnee chalcopyrite deposit, southern Urals)
Russian Geology and Geophysics (February 2010) 51 (2): 176-185

Abstract

Cobalt behavior during the oxidation of sulfide ores, unlike that during the oxidation of Co ores, is poorly known. Moreover, cobalt sulfates are rare in the world. Complex hydrous cobalt-containing and cobalt sulfates have been found in technogenic zones at the Letnee chalcopyrite deposit (Southern Urals). They have been identified at pit bottoms, in the ore stockpile, as well as directly on ore fragments and the evaporation barriers of underdump water puddles. The paper reports the first experimental data on the oxidative leaching of Co-containing sulfide ores in the laboratory. Also, parts of a thermodynamic model for Co behavior in oxidized zones are presented. Experiments have revealed an increase in acidity up to pH = 4.14, along with transport of sulfate sulfur and metals into solution. This suggests acid mine drainage during the development of the Letnee deposit. The published stability diagrams for hydrous Cu, Mg, Zn, Co, and Ni sulfates were analyzed and compared with mineralogical finds in a technogenic oxidized zone. This made it possible to explain the precipitation sequence of minerals from solutions during their concentration by evaporation. As salts of these elements are highly soluble, significant contents of toxic metals will inevitably remain in equilibrium solution, necessitating additional waste-water treatment (for example, creating sorption geochemical barriers). Therefore, the paper describes regularities in Co behavior during its sorption on solid phases.


ISSN: 1068-7971
Serial Title: Russian Geology and Geophysics
Serial Volume: 51
Serial Issue: 2
Title: Cobalt behavior during natural and technogenic oxidative leaching of Co-containing pyrites (Letnee chalcopyrite deposit, southern Urals)
Affiliation: Russian Academy of Sciences, Siberian Branch, V. S. Sobolev Institute of Geology and Mineralogy, Novosibirsk, Russian Federation
Pages: 176-185
Published: 201002
Text Language: English
Publisher: Allerton Press, New York, NY, United States
References: 25
Accession Number: 2021-070337
Categories: General geochemistryEnvironmental geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
N50°52'60" - N50°52'60", E59°30'00" - E59°30'00"
Secondary Affiliation: Russian Academy of Sciences, Ural Division, Institute of Mineralogy, Miass, RUS, Russian FederationRussian Academy of Sciences, Kola Scientific Center, I. V. Tananayev Institute of Chemistry and Technology of Rare Elements and Minerals, Apatity, RUS, Russian Federation
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2021
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