Abstract
The elemental composition of vapor-gas streams obtained during heating of secondary hydrous sulfates are presented. Samples of abundant sulfate intergrowth were collected at the Belovo waste heaps and heated at 60ºC in experiments to collect condensates of the releasing vapor-gas streams. A wide spectrum of major and trace elements was determined in the condensate. Chemical elements can be absorbed by the water vapor and migrate with this phase during the dehydration of hydrous sulfates. To determine the mechanisms of migration and the sources of elements in vapor-gas streams, a study of the features of certain hydrous sulphates (antlerite, goslarite, starkeyite, gunningite, siderotile, sideronatrite) by stepwise heating up to 60ºC was conducted. Alteration in the phase composition is controlled by powder X-ray diffractometry. It was determined, that antlerite and starkeite remain stable throughout the temperature range. The beginning of the separation of structural water in goslarite and siderotile occurs at 40°C. Goslarite and sideronatrite at 40°C lost water molecules and transformed to gunningite and Na-jarosite, correspondingly. Structure of siderotile was loosened. The modes of occurrence of the chemical elements in sulfates and pore solution determine the concentrations of elements in the condensates.
Highlights
Metal-sulphate salts play an important role in the storage of acids and metals released during the weathering of mineralized rocks, coal deposits, metallic ore deposits, and mine wastes [1,2,3]
Pore solution squeezed from the bulk sample is highly mineralized acidic sulphate Cu-Zn brine with TDS more than 300 g/L and high concentrations of Na, Fe, and Mg and
A wide range of chemical elements can migrate in a vapor-gas stream at low temperature heating of secondary hydrous sulfates (60°C), which was determined by the analysis of condensates
Summary
Metal-sulphate salts play an important role in the storage of acids and metals released during the weathering of mineralized rocks, coal deposits, metallic ore deposits, and mine wastes [1,2,3]. A large amount of work has been devoted to the study of sulphate minerals as an important link in the process of water-sulphide interactions. There has been increasing interest in the use of salt hydrates as thermochemical heat storage materials [5,6] Another important direction in the research of secondary mineral dehydration is chemical element transport in the vapor streams [7,8,9]. The purpose of this work was to deter-mine the composition of the vapor-gas mixture separated from sulphate minerals during heating
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