Abstract
It was suggested to purify poor lanthanide concentrate precipitated from the extraction orthophosphoric acid produced by the dihydrate process to remove phosphorus and fluorine compounds by heating a mixture of the concentrate with sulfuric acid in the presence of hydrated silica followed by water leaching of water-soluble sulfates and phosphates. The treatment conditions for the separation of the bulk of phosphorus(V) and the entire fluorine in the form of SiF4 were determined, ensuring approximately 3.5-fold increase in lanthanide concentration.
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Original Russian Text © E.P. Lokshin, O.A. Tareeva, 2010, published in Zhurnal Prikladnoi Khimii, 2010, Vol. 83, No. 11, pp. 1787–1792.
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Lokshin, E.P., Tareeva, O.A. Treatment of rare-earth concentrate to remove phosphorus and fluorine compounds. Russ J Appl Chem 83, 1919–1924 (2010). https://doi.org/10.1134/S1070427210110042
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DOI: https://doi.org/10.1134/S1070427210110042