Relevance of the work caused by necessity of expanding the database of the mutual solubility of salts of rare earth elements to create technologies for producing them in pure form for high-tech industries. The main aim of the study: was to investigate reciprocal solubility of lanthanum and erbium bromates and trichloroacetates in the water and the and to determine the conditions of solid solutions formation and the possibility of obtaining concentrates of lanthanum and erbium.
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