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THERMAL STUDIES OF THE PROCESS OF INTERACTION OF TIN OXIDE, LEAD AND ANTIMONY WITH SODIUM PHOSPHATES

Feruza Berdikulova

Abstract

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 пїЅC interacts with the decomposition product of the refining reagent to form stable phosphorus compounds, the antimony oxide (III) is oxidized to an antimony oxide (V) with increasing temperature and does not interact with the refining reagent. Thermal study of the Sb-Sn alloy (95.87 %-4.13 %) with a refining reagent showed tin oxidation at 1500 пїЅC. Thermal study of rough antimony showed intensive oxidation of rough antimony over 700 пїЅ?. The reasons for the loss of antimony are explained with the transition of the oxidized part of antimony to the slag with increasing temperature and the formation of complex phosphates.

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