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Mineralogical variations with the mining depth in the Congo Copperbelt: technical and environmental challenges in the hydrometallurgical processing of copper and cobalt ores

Shengo L. M., Kitobo W. S., Kime M.-B., Mambwe M. P., Nyembo T. K.

Journal of Sustainable Mining

2020

Vol. 19, iss. 2

96--114

For a long time in the Democratic Republic of Congo, the mining of ores for the production of copper cathodes and salts of cobalt was mostly conducted in the near-surface oxidized mineralization of the Congo Copperbelt. An important part of this mineralization is found in geological settings where copper and cobalt mainly exist as mixtures of oxides and sulfides. With the depletion of surface-rich minerals, mining is taking place at depths where sulfide minerals are prevalent. Using current technologies, the hydrometallurgical processing of ores with high levels of sulfide minerals results in poor metal recovery due to their retention in process wastes. These mineral wastes have the propensity to lead to Acid Mine Drainage (AMD) when exposed to rainfall and atmospheric air. Therefore, major changes in the technologies implemented will be needed in order to guarantee higher process efficiencies while endeavoring to uphold environment safeguarding reinforcement. This work aimed to demonstrate the urgency of updating the hydrometallurgical technologies implemented for the processing of copper-cobalt ores with an emphasis put on minimizing the environmental footprint of process wastes. Four copper-cobalt deposits and downstream hydrometallurgical processes were surveyed to get a better understanding of how changes in mineralization occurring in the deposits will influence the processing technologies and practices during the management of process wastes.

Wpływ parametrów wytwarzania na własności spieków z wytrącanych proszków miedzi.

Leżański J., Gacek S., Radoń A., Olszewska I.

Rudy i Metale Nieżelazne

1999

R. 44, nr 1

29-32

Przedstawiono wyniki badań nad wpływem parametrów wytwarzania na własności spieków z wytrącanych proszków miedzi, powstałych w pierwszym etapie hydrometalurgicznej przeróbki zgorzeliny miedzianej. Badano gęstość wyprasek oraz gęstość, wytrzymałość na zginanie, twardość, oporność elektryczną i strukturę spieków. Otrzymano spieki charakteryzujące się wysokimi własnościami, wskazującymi na dużą przydatność hydrometalurgicznego proszku miedzi do celów metalurgii proszków.

There are presented the results of examination of the influence of production parameters on the properties of sinters from precipitated copper powders, generated during the first stage of hydrometallurgical working of copper scale. There were studied the density of the compacts and density, bending strength, hardness, electric resistance and structure of the sinters. The gained sinters were of high quality, having good suitability of the hydrometallurgical copper powder in powder metallurgy.