Thermodynamics of arsenates, selenites, and sulfates in the oxidation zone of sulfide ores. IX. Physicochemical formation conditions and thermal stability of zinc selenites
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- 作者：M. V. Charykova ; E. L. Fokina ; E. V. Klimova ; V. G. Krivovichev…
- 刊名：Geology of Ore Deposits
- 出版年：2014
- 出版时间：December 2014
- 年：2014
- 卷：56
- 期：7
- 页码：546-552
- 全文大小：578 KB
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- 出版者：Springer US
- ISSN：1555-6476
文摘
The aim of this study is to create a physicochemical analysis of the formation conditions of synthetic zinc selenite, ZnSeO3 · 2H2O and an experimental investigation of its thermal stability, dehydration, and dissociation. This study has been carried out using a comprehensive thermal analysis (thermogravimetry and differential scanning calorimetry) within the temperature interval from 25-00°C. It has been established that ZnSeO3 · 2H2O dehydrates at 81-22°C through four stages corresponding to the formation of intermediate hydrate species: ZnSeO3 · 5/3H2O, ZnSeO3 · H2O, and ZnSeO3 · 1/3H2O. It is suggested that under natural oxidation conditions zinc selenite precipitates as stable (ZnSeO3 · 2H2O) or metastable (ZnSeO3 · H2O) species. Anhydrous ZnSeO3 presumably exists at a higher temperature (up to 479°C) and breaks down within a temperature interval of 479-97°C to form ZnO and SeO2.