Thermodynamics of arsenates, selenites, and sulfates in the oxidation zone of sulfide ores. IX. Physicochemical formation conditions and thermal stability of zinc selenites

Charykova, M. V.; Фокина, Е. Л.; Klimova, E. V.; Кривовичев, В. Г.; Semenova, V. V.

doi:10.1134/s1075701514070046

Cited by 11 publications

(1 citation statement)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The solubility and the thermal behavior of synthetic ZnSeO3·2H2O, and ZnSeO3·H2O were discussed in [55,57]. It was shown that ZnSeO3·2H2O is a more stable phase than ZnSeO3·H2O under environmental conditions.…”

Section: Thermodynamic System Zn-se-h2omentioning

confidence: 99%

The Thermodynamics of Selenium Minerals in Near-Surface Environments

2017

View full text Add to dashboard Cite

Selenium compounds are relatively rare as minerals; there are presently only 118 known mineral species. This work is intended to codify and systematize the data of mineral systems and the thermodynamics of selenium minerals, which are unstable (selenides) or formed in near-surface environments (selenites), where the behavior of selenium is controlled by variations of the redox potential and the acidity of solutions at low temperatures and pressures. These parameters determine the migration of selenium and its precipitation as various solid phases. All selenium minerals are divided into four groups-native selenium, oxide, selenides, and oxysalts-anhydrous selenites (I) and hydrous selenites and selenates (II). Within each of the groups, minerals are codified according to the minimum number of independent elements necessary to define the composition of the mineral system. Eh-pH diagrams were calculated and plotted using the Geochemist's Workbench (GMB 9.0) software package. The Eh-pH diagrams of the Me-Se-H 2 O systems (where Me = Co, Ni, Fe, Cu, Pb, Zn, Cd, Hg, Ag, Bi, As, Sb, Al and Ca) were plotted for the average contents of these elements in acidic waters in the oxidation zones of sulfide deposits. The possibility of the formation of Zn, Cd, Ag and Hg selenites under natural oxidation conditions in near surface environments is discussed.

show abstract

Section: Thermodynamic System Zn-se-h2omentioning

confidence: 99%