Study of Conversion of Waste Jarosite Precipitates to Hematite

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F14%3A43898418" target="_blank" >RIV/60461373:22310/14:43898418 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Study of Conversion of Waste Jarosite Precipitates to Hematite
Original language description
Sodium and ammonium jarosite precipitates from the sulfuric acid leaching of deep-sea nodules were converted into well crystallized hematite by alkali decomposition of jarosite using sodium hydroxide or ammonia solutions at different temperature and subsequent sintering at 400 and 750 °C. The obtained sodium and ammonium jarosite precipitates were intergrown aggregates composed of half-prism and tabular-like crystals with sharp corners and edges. It was found that base-strength of alkali solutions affected the kinetics of conversion reactions of solid phase. The residual solids retained the shape and the particle size of the original jarosite precipitates. The main feature of the residual from sodium jarosite is a severe surface pitting and an erosionof edges and corners. The decomposition of ammonium jarosite precipitates at different temperatures took place very fast and completed within 15 minutes at 25 °C. Increasing temperature increased the decomposition rate. At 60 °C, jarosite
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
JG - Metallurgy, metal materials
OECD FORD branch
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Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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