Thermodynamics of arsenates, selenites, and sulfates in the oxidation zone of sulfide ores. X. thermal stability and dehydration features of synthetic analogs of the cobaltomenite–ahlfeldite solid solution series

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

doi:10.1134/s107570151507003x

Cited by 4 publications

(1 citation statement)

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“…These data were used for plotting the Eh-pH diagram of the Ni-Se-H2O system ( Figure 3). The thermal stability, the solubility and the thermochemical calorimetric investigations were carried out on a synthetic analogue of ahlfeldite [49,52,53]. The EhpH diagram of the Ni-Se-H2O system ( Figure 3) contains the stability fields of native selenium, penroseite and sederholmite, and a wide field of bunsenite.…”

Section: Thermodynamic System Ni-se-h2omentioning

confidence: 99%

The Thermodynamics of Selenium Minerals in Near-Surface Environments

2017

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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.

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Section: Thermodynamic System Ni-se-h2omentioning

confidence: 99%