DEVELOPMENT OF A COMBINED TECHNOLOGY FOR NONACID FLOTATION-HYDROMETALLURGICAL PROCESSING OF NONECONOMIC COPPER ORE STOCKPILES

The study is focused on possible replenishment of copper reserves by processing of previously neglected uneconomic and low-grade copper ore stock piles and on the new innovative technologies required to this effect. In terms of the copper-bearing stock pile at the Taskora deposit in the Zhaman–Aibat ore field, Kazakhstan, the content of which is represented by copper–sulphide and oxidized ore to 53% and 47%, respectively, while rock-forming minerals are represented to a great extent by carbonates (22.6% dolomite and 4.9% calcite), the combined technology of nonacid flotation–hydrometallurgical processing is substantiated. The tests of the stock pile material dressability by flotation and hydrometallurgical methods are described. It is shown that flotation only allows copper recovery in concentrate at a level of 44–45%. The parameters of combined flotation–hydrometallurgical processing with leaching of oxidized copper minerals by sulfate of ammonia at the stage of grinding followed by flotation of sulfide minerals are determined. In this case, the total copper recovery in flotation concentrate and pregnant solution intended for subsequent processing up to cathode copper exceeds 84%. Treatment of the Taskora stock pile material using the combined technology will allow marketable production, increased completeness of copper extraction from mining waste and environmental safety due to nonacid ammonia leaching.

Keywords

Stock pile, processing, sulfide copper minerals, oxidized copper minerals, flotation, leaching, combined technology.

Issue number: 12
Year: 2018
ISBN:
UDK: 622.772
DOI: 10.25018/0236-1493-2018-12-0-151-167
Authors: Gorlova O. E., Shadrunova I. V., Sinyanskaya O. M.

About authors: Gorlova O.E., Candidate of Technical Sciences, Assistant Professor, Magnitogorsk State Technical University named after G.I. Nosov, 455000, Magnitogorsk, Russia, Shadrunova I.V., Doctor of Technical Sciences, Professor, Head of Department, Institute of Problems of Comprehensive Exploitation of Mineral Resources of Russian Academy of Sciences, 111020, Moscow, Russia, e-mail: shadrunova_@mail.ru, Sinyanskaya O.M., Treatment Specialist, LP KazGidroMed, 100009, Karaganda, Kazakhstan.

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