REMOVAL OF As FROM THE SULPHUR ACIDIC WASTE SOLUTION OBTAINED IN THE ELECTROLYTIC COPPER REFINING PROCESS

Radmila Marković, Bernd Friedrich, Jasmina Stevanović, Branimir Jugović, Milica Gvozdenović, Jasna Stajić-Trošić, Branka Jordović
2010 Trends in the Development of Machinery and Associated Technology" TMT 2010   unpublished
The aim of this paper was to examine the possibility of electrolytic treatment of the sulphur acidic waste solution with high content of copper, nickel and arsenic. This waste solution is product of the conventional electrolytic copper refining process. The copper bearing anodes with non-standard content of nickel, lead, tin and antimony were specially prepared for the refining process. During the process, the change of electrolyte chemical composition as so as the content of copper, arsen,
more » ... copper, arsen, antimony and tin in anode slime, was monitored for the different electrolyte temperatures, T 1 = 63±2 o C and T 2 = 73±2 o C. The results are shown that by using the anode with the highest content of tin and antimony, the concentration of As in solution is significantly reduced, more than 92 wt. %. 1. INTRODUCTION The commercial anodes with copper content from 98.0 to 99.5 wt. % and the sulphate-acidic solution with Cu 2+ ion concentrations ranging from 35 to 50 g dm-3 and sulphuric acid concentrations ranging from 150 to 250 g dm-3 , are used in the conventional copper electrolytic refining process [1, 2]. The process is developed under the force of an applied direct current such as Cu ion dissolves at the anode and then deposit onto the cathode. Except the copper as the base metal, the anodes also contain the other ingredients that with positive effect on anode solubility as well as the quality of cathode slime, are called the alloying elements, and without those properties, are called the anode impurities. Chemical and electrochemical properties of selected alloying elements were not such to significantly reduce the solybility of anode material in order to reduce or prevent the formation of Ni oxide, which causes anode passivation and to remove As from the working electrolyte.
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