Authors: A.B. Arinova, V.P. Dmitrienko

Title of the article: The process of electrochemical reduction of rhodium

Year: 2019, Issue: 4, Pages: 47-54

Branch of knowledge: 05.17.02 Technology of rare, scattered and radioactive elements

Index UDK: 66.087.2

DOI: 10.26730/1999-4125-2019-4-47-54

Abstract: Recently, there has been a leap in the development and implementation of new electrochemical processes in the technology of rare and noble metals. The chemistry and technology of rhodium is a dynamically developing area due to an increase in the demand for rhodium and its compounds. Electrochemical production of rhodium from electrolyte solutions is complex in hardware design, time-consuming, and is a multi-stage process. The obtained precipitates are often very thin, fragile, and used electrolytes are toxic. The article presents an electrochemical method for producing metallic rhodium in a diaphragm-free electrolyzer. The reactions describing this process are shown, from which it is clear that the process is proceeding with the release of chlorine gas. This is a negative factor due to toxicity of the gas and high corrosiveness of wet chlorine. In the article, the issues of development of new technology of rhodium electrodeposition are considered. The new design of the electrolyzer is developed for carrying out the process of electrochemical restoration of rhodium of chloride complexes. The scheme of process of rhodium electrodeposition (Fig. 1) and the pilot electrolyzer (Fig. 2) are shown. The effect of the current density of rhodium deposition and the time of the electrolyte on the cathode current output of the electrolyzer with a cation exchange membrane is studied (Fig. 3) is investigated. The electrolyzer design which allows raising the rhodium sedimentation to a considerable extent is offered. Creation of a process of rhodium electrochemical restoration without release of gaseous chlorine will improve significantly the working conditions and reduce the technogenic load exerted by the enterprise on the environment.

Key words: rhodium electrochemical reduction membrane electrolyzer product solution

Receiving date: 09.07.2019

Approval date: 01.01.1970

Publication date: 19.12.2019

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