Impurity Distribution And Control Study In Copper Electrolytic Refining Process

With the raw material composition of Jin chuan copper electrolysis anode plate becoming more and more complicated, the product quality and the operation processes are becoming more difficult to control. Therefore, it is necessary to optimize the production process, for improving process adaptability to raw materials.According to material conditions of copper anode plate and preliminary test and trial work, a new additive ADT was successfully applied to Jinchuan electrolysis copper production with high current density. The result showed that the amount of suspended solids in the CuSO4 electrolyte dropped about one order of magnitude. The core technology of copper electrolysis additive with independent intellectual property rights were obtained in Jinchuan Non-ferrous metal company.Through optimizing and upgrading vacuum evaporator-water cooling crystallizer control condition in the depth copper removal purification system of Jinchuan copper electrolyte process, The purification technology, in the of copper electrolyte purification technology with the removal of, the concentration of copper ion in acrystalline mother liquor in copper electrolytic solution dropped from 35g/L to lower than 15g/L, and the crude copper sulfate output increased by 2948t/a. By adjusting the main liquid feeding way in the process of copper induction removal, the removal rate of As, Sb, Bi than design value was increased by 1%, 5%, 5%, the output of black copper(slag) was reduced by 1125t/a, and the direct recovery of copper was increased by 0.04%.On the basis of the copper ion concentration polarizationtheory in electrolytic production, the cyclone electrolysis technology was applied to the Jin chuan copper electrolyte purification. Extraction conditions of copper and removal of arsenic, antimony, bismuth and other impurities were mainly controlled under certain copper ion concentration in the certain conditions and electric current density of 400A/m2-900A/m2, copper was extracted as standard cathode copper from copper slag of original copper removal process. The copper products met the standards copper cathode national standard of GB/T467-1997(CATH-2) under the premision control of impurity purification efficiency, and the integrated current efficiency reached to 95% or more.Selective removal effect of SF-11 resin for impurities Sb and Bi were explorated and researched. The penetration point, backwash effects and regeneration performance of SF-11 resin were tested, the removal rate of Sb and Bi were stably rised up to 85%. Removal mechanism of As, Sb, Bi and other impurities in electrolyte can be attributed to complexes forming and co- precipitate from the solution under the cell conditions within the temperature of the solution(63℃), by compensating heighten arsenic solution. A new selectrolytic copper impurity purification process for copper electrolysis technology were formed.