Abstract
The degree of purity of cathode deposits during the electrochemical refining of rough indium depends on the content of impurity metals in the electrolyte. In this work, an additional sorption purification of the refining electrolyte was carried out in order to reduce the content of such impurity metals as cadmium, lead, copper. Chitosan was used as a sorbent due to high sorption properties with respect to heavy metal ions. The determination of the concentration of the studied metals before and after the sorption was carried out by the method of differential pulse anodic stripping voltammetry (DPASV). The experimental results allowed to calculate the amount of metal sorbed by chitosan and the efficiency of its removal. The Langmuir and Freundlich adsorption models were applied to describe the equilibrium isotherms and isotherm constants were determined. The Langmuir model agrees very well with experimental data. An inductively coupled plasma optical emission spectroscopy (ICP-OES) method was used to determine the presence of impurity metals and the degree of purity of electrorefined indium. The use of chitosan as a sorbent in the purification of rough indium allows to reduce the concentration of impurity metals in cathode deposits and to increase the content of the base metal to 99.9994%.
Highlights
Practical application of indium in the space, nuclear, aviation industry, in the production of liquid crystal screens, photocells and in microelectronics is due to its properties such as strength, plasticity, corrosion resistance
The removal of impurity metals by traditional methods often leads to an insufficient reduction in their concentration
The experimental results were simulated using the Langmuir and Freundlich sorption isotherms, from which the highest regression value corresponding to the Langmuir model
Summary
Practical application of indium in the space, nuclear, aviation industry, in the production of liquid crystal screens, photocells and in microelectronics is due to its properties such as strength, plasticity, corrosion resistance. These properties are inherent only to indium of high purity. Existing technologies for obtaining high-purity indium are multistage and require the use of combined methods. The removal of impurity metals by traditional methods often leads to an insufficient reduction in their concentration. One of the promising directions in the refining of metals is the use of the electrochemical method in combination with others [1,2,3]
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