A novel sequential heap leach process for treating crushed Platreef ore
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A novel sequential heap leaching process has been identified as a possible alternative to the conventional concentrate–smelt–refine route for processing Platreef ore, a platinum group metals containing ore with palladium predominance. The present study focuses on testing this process on crushed whole ore, after initial experiments conducted on low-grade Platreef flotation concentrate achieved promising results. Two samples of drill core Platreef ore with size distributions of - 25 mm + 1 mm and - 6 mm + 1 mm were first bioleached in cylindrical columns, to simulate heap leaching, at 65 °C and then leached with cyanide solution at 50 °C in cylindrical columns. Overall the best results were achieved from the tests on the - 6 mm + 1 mm size fraction sample. After 304 days 93% Cu, 75% Ni and 53% Co were extracted in the bioleach experiment, and after 60 days 57.8% Pt, 99.7% Pd and 90.3% Au in the follow-up cyanide leach experiment. Analysis using a mineral liberation analyser suggested that Pt and Pd were leached mostly from the tellurides while the Pt arsenides appeared resistant to cyanide leaching. From the results it is proposed that the process considered herein is a potential alternative route to treat Platreef ore.
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Mwase, James; Petersen, Jochen; Eksteen, Jacques (2012)Samples of low-grade flotation concentrate derived from Platreef ore were treated with a two-stage heap leach process to determine the potential to run this process parallel to the convential concentrate–smelt–refine ...
The extraction of Pt, Pd and Au from an alkaline cyanide simulated heap leachate by granular activated carbonMpinga, C.; Bradshaw, S; Akdogan, G.; Snyders, C.; Eksteen, Jacques (2013)A two-stage heap leach process to extract base and precious metals from the Platreef low-grade ores is currently being investigated industrially. As part of the investigation, and by analogy with current gold recovery ...
Gold and copper leaching from gold-copper ores and concentrates using a synergistic lixiviant mixture of glycine and cyanideOraby, E.; Eksteen, Jacques; Tanda, B. (2017)© 2017 Elsevier B.V.The presence of cyanide soluble copper in the cyanidation of gold-copper ores and concentrates significantly increases the cyanide consumption in order to achieve sufficient gold recovery. In addition, ...