Recycling

Biography

Biography: Kulzira K Mamyrbayeva

Abstract

Involvement in the processing of previously unprocessed poor oxidized, mixed, persistent oxidized ores, as well as waste of beneficiating plants, is becoming an increasingly urgent task. The processing of such ores by traditional methods is very complex and inefficient. A large amount of copper is contained in the dumps of off-balance, hard-processing and stale ores of Kazakhstan. The practice of operating enterprises shows, that in the process of heap leaching of this type of raw material, it is possible to extract 40-60% of copper. Therefore, some tailings of leaching can also be considered as a potential raw material for copper recovery. The purpose of our studies was to extract copper from the tailings of leaching of the Kounrad deposit ore with a copper content of 0.32%. Physico-chemical studies found that the copper content in the leaching tail is 0.33% and the main oxidized copper minerals in the samples are malachite, azurite, cuprit; Sulphide minerals - chalcopyrite, covellite, chalcosine; The main iron minerals are siderite and pyrite, the waste rock is up to 80% silicon oxide, the rest are aluminum silicate, muscovite, potassium hydrogen sulfate, aluminum sulfate, kaolinite, andalusite, pyrophyllite, nacrite. Agitation leaching was conducted with solutions of sulfuric and hydrochloric acids of different concentrations, with and without the presence of an oxidizing agent. It was found that, during leaching process with sulfuric and hydrochloric acids without oxidizing agent, copper extraction increases with the increase of concentration and duration of the acids, and does not exceed 35%. In the presence of an oxidizer - hydrogen peroxide, the extraction rate of copper increases - up to 70%. Solutions with a copper content of up to 2.0 g/l were obtained by multi-stage leaching of samples. Concentration and refining of copper was carried out according to the scheme 2Е+1S with the extractant Lix 9858 NSC in kerosene. The extraction was carried out at a pH of 3.5, the ratio of the organic and aqueous phases -1.5, and the extractant concentration -10%. The degree of copper recovery in a two-staged extraction was 92%. The copper stripping was carried out with the electrolyte of the following composition, g/l: 35 Cu; 180 g/l Н2SO4, with the ratio of the organic and aqueous phases - 11.6. Under such conditions, the copper recovery is 98% and a solution with a copper content of up to 50 g / l is obtained. The results of the work are recommended for verification on an enlarged scale.