Lead and tin removal from antimony metal by refining process with phosphorus compounds
Journal Title: Metallurgical and Mining Industry - Year 2017, Vol 9, Issue 7
Abstract
The fire refining processes for antimony with the objective to primarily remove tin and lead as much as to receive respective residuals of 0.002% and 0.02% in the metal are multistage processes, associated with significant antimony losses during the slag phase, particularly when deep treatment for tin removal. This effect is observed due to the very close thermodynamic affinity of tin and antimony for oxygen. The present article concerns achieving the deep lead and tin removal from the antimony-bearing substance along with the decrease in antimony losses by slag and gases and studies refining with the mixture of sodium dihydrogen phosphate and phosphorus acid for antimony recovery. The reacting agent for the crude antimony refining to remove lead and tin was made from the preparatory mixture of sodium dihydrogen phosphate and phosphorus acid, taken in the certain ratio, and dehydrated. Following the addition of the prepared flux into the rough antimony, mixture was placed into the alundum crucible and heated in the muffled furnace with the observance of the certain temperature and time regime. The reported research has resulted in the optimal composition for refining antimony to remove lead and tin. Under optimal refining conditions, has been received the refined antimony metal with the remaining lead and tin as low as 0.015-0.008% and 0.005-0.001% respectively.
Authors and Affiliations
F. A. Berdikulova, E. A. Mazulevskiy, A. O. Sydykov, N. M. Seidakhmetova, Т. V. Kovzalenko
Keywords
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