Abstract
The chemical and mineral compositions of the gray and red slimes formed by the disintegration of silicon–titanium ores from the Pizhemskoe deposit are considered. The results of studying their hydrochloric acid leaching in 20% HCl in a temperature range of 40–200°C are presented. An increase in the leaching temperature leads to an increase in the access the slimes, which is related to the decomposition of a series of mineral phases. Siderite and goethite decompose at 40–100°C. The decomposition of the clay minerals occurs at temperatures of 90°C and higher. This process is accompanied by the formation of gel-like SiO2. Under pressure leaching conditions, pseudorutile, monazite, and xenotime simultaneously decompose together with the transition of cerium, neodymium, and yttrium to a solution. Complete decomposition of the minerals containing rare-earth metals is achieved at 180°C. The undecomposable solid residue is represented by rutile, quartz, amorphous SiO2, and zircon.
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This work was carried out in terms of state assignment no. 075-00715-22-00.
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Translated by E. Yablonskaya
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Anisonyan, K.G., Kop’ev, D.Y., Zablotskaya, Y.V. et al. Hydrochloric Acid Decomposition of the Clay Slimes of Silicon–Titanium Ores. Russ. Metall. 2023, 1–6 (2023). https://doi.org/10.1134/S0036029523010020
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DOI: https://doi.org/10.1134/S0036029523010020