This work is devoted to the investigation of the possibilities of processing oxidized copper ore and sulfide copper concentrate of the Aktogay deposit by pyrometallurgical methods at the operating metallurgical units of the largest copper producer in Kazakhstan, Kazakhmys Smelting Ltd. The chemical, phase compositions and thermal properties of the samples of the Aktogay ore and concentrate were investigated. To test the possibility of using oxidized copper ore of the Aktogay deposit as quartz flux for autogenous smelting in Vanyukov furnaces (VF) with copper sulphide concentrates laboratory experiments were carried out. They made it possible to establish that the replacement of quartz flux on the oxidized ore of the Aktogay deposit is entirely permissible in consideration of the satisfactory composition of slags and mattes obtained in the smelting, even when the content of silica in the ore is 64.56 %. With a higher content of silica in the ore, its use as a flux will be even more effective. The available capacities of the two Vanyukov furnaces are not sufficient for processing all available high-sulfur raw materials, including the Aktogay sulphide copper concentrate, using autogenous melting. Therefore, in the laboratory and in an industrial scale, a preliminary test was carried out on the possibility of processing a part of the copper poor and high-sulfur Aktogay concentrates on the electric furnaces of the Zhezkazgan Copper Smelting Plant (ZCS). The results of laboratory studies and preliminary industrial tests have shown the possibility of such processing with the production of mattes containing no less than 47 % of copper and suitable for converting on existing equipment of ZCS.

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This article presents a study on the processing of waste dust from electrical smelting of ilmenite concentrates with the removal of silica from them by alkaline and fluoride methods. The study of the smelting dust leaching by caustic soda solutions included investigation of the effect of sodium hydroxide concentration, process time, temperature, S:L ratio. The optimum conditions of concentrate electric smelting dust leaching - temperature 80-90 °С, duration 90-120 minutes, S:L ratio = 1:5, sodium hydroxide solution concentration 110-115 g/dm3 were determined. The optimum conditions for fluorination of electric melting dust were determined, at which the sublimation degree of silicon fluoride was 84.2 %. Studies have been performed to decomposite obtained silicon-containing sublime in the presence of ammonia agent. The optimum pyrolysis modes that provide the separation of fluoride and silicon oxide - temperature 530-560 °C and duration of 60-80 min have been determined based on the results of thermal analysis and studies on the process duration effect. The silicon oxide content in the obtained product was 96.3%.

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