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To study the process of refining of crude antimony containing as hard-to-remove admixtures of lead and tin, thermal studies of model and experimental samples of antimony were carried out. As a refining reagent, a melt prepared from sodium dihydrogen phosphate and orthophosphoric acid was used. The results of the study showed that the lead oxide after the process of dehydration and dehydration of sodium phosphate salts at 760 °C interacts with the decomposition product of the refining reagent to form stable phospho...