ELECTROLYTIC SEPARATION OF SELENIUM FROM LEAD ADMIXTURES
Abstract
In this article the electrochemical methods were developed for selenium separation from the lead admixtures in technical selenium which was obtained at the refining the anodic muds from Shchelkovo combinate at the use of nitro-acidic and sulfur-acidic electrolytes. At the optimal conditions of carrying out the electrolysis under using nitrogen acidic electrolytes almost all lead is precipitated on the anode and, accordingly, it is separated from selenium. Later, after separation of the main mass of lead, the precipitation of selenium on the cathode was carried out. According to technology proposed the electrolytic selenium of high purity degree (99.999%) was obtained at application of nitric solutions of electrolyte. The content of lead in the complex cathode-selenium was 1·10-4%. Under the optimal conditions of selenium precipitation from the hydrochloric acidic electrolytes, selenium was not found in the cathode sediments of lead. The admixtures of different elements (Te, Pb, Bi, Ag, Si and others) existing in technical selenium make worse its electrophysical properties very strongly. In order to obtain selenium with a high degree of purity, it is necessary to carry out the wide scientific investigations in the field of electrolytic purification of technical selenium.
Forcitation:
Mirzoyeva A.A., Bakhtiyarli I.B. Electrolytic separation of selenium from lead admixtures. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 3. P. 67-71.
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