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.
Russian Journal of Applied Chemistry – Springer Journals
Published: Dec 24, 2010
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