PROCEDURE FOR CALCULATION OF MEMBRANE ELECTROLYTIC CELL AND STUDY OF TECHNOLOGICAL REGIME OF ELECTRODEPOSITION OF RHODIUM

A.B. Arinova, V.P. Dmitrienko
DOI: 10.25699/SSSB.2020.30.62749 Download PDF
Abstract: The specifics of the platinum metal separation technology process and the shortage of raw materials cause high prices for rhodium. Thus, increasing the efficiency of technological processes is impossible without studying the fundamental and applied foundations of rhodium electrolytic deposition. The aim of this work was to determine optimal parameters and to create an algorithm for calculating membrane electrolysers for rhodium electrochemical deposition. Hydroelectrometallurgical processes for producing non-ferrous and noble metals are characterized by the specificity of the raw materials used, specificity of electrochemical technologies and specificity of equipment for their implementation. In this regard, the methodology of calculation of electrolysers for the deposition of noble metals cannot contain universal engineering calculation methods suitable for any electrochemical processes and designs of electrolysers. The method allows determining design and technological parameters of the electrolyser. This type of electrolyser can be used not only in the production of rhodium, but also for other metals, in particular, gold deposition from thiourea and rhodium solutions. The technological scheme of rhodium electrodeposition with creation of the closed cycle of anolyte and productive solution is developed. The possibility to adjust the interelectrode distance, ease of operation, quick change of membrane or type of anodes and cathodes allows to use the electrolyser for research purposes and for development of technological parameters. Such technology and design of the membrane electrolyser is cost-effective, as its implementation will significantly increase the degree of rhodium recovery during electrodeposition and avoid chlorine release. This is a negative factor due to gas toxicity and the high corrosiveness of wet chlorine. Therefore, this design improves working conditions and reduces the technogenic load of the enterprise on the environment.
Index terms: membrane electrolyser, electrochemical rhodium deposition

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