removal of co, ni and cd at single-stage purification of zinc solution by sb2o3

Abstract: leaching means the selective dissolution of a metal (or several metals) in a concentrate by a suitable solvent to separate and recover the metal. usually some of the elements in the concentrate will dissolve with the metal, these annoying elements are called impurities. the most important impurities studied in this industry are co, ni, cd, fe and pb [1]. the industry uses several tanks to remove these impurities, each of which has a specific temperature and specific materials. in most factories, to remove co, they use kmno4 which is considered an expensive substance, and then in another tank, it removes cd and ni, but in this method, we remove co, cd and ni in a tank by sb2o3, copper sulfate and zinc powder, which saves time, money and energy. here we study the effect of ph, temperature and consuming materials on the removal of impurities, the best temperature and ph with repeated tests measured at different concentrations of zinc is 85 °c and ph 5.5. the results were examined by a varian, aa240 atomic absorption instrument and titration method, which has significantly increased the purity of the zinc ingot [2, 3].