Assessing a Two-Stage Heap Leaching Process for Platreef Flotation Concentrate
MetadataShow full item record
The Platreef is a relatively rich ore body in terms of the presence of platinum group metals (PGMs) and base metals (BMs). It differs from the Merensky and UG2 ore bodies in that a significant portion of the PGMs are associated with the silicates or on base metal sulphide-silicate grain boundaries, it has an unfavourable Pt to Pd ratio and although there is significant Au, there is much less Rh and Ru than in the Merensky or UG2 ores. Additionally, a large portion of PGMs occur as bismuth-tellurides and arsenides, which have been observed to be slow floating, requiring high mass pulls to obtain high concentrator recoveries. The high mass pulls invariably leads to grade dilution. Due to this unique mineralogy the conventional process of milling, flotation, smelting and matte pressure leaching leads to marginal process economics, with high energy and water costs, high skilled labour requirements and large capital and operating costs. Moreover, the Platreef resource lies in an arid area of South Africa, with a low skilled labour pool and poor electrical infrastructure. Additionally, a considerable amount of the PGMs will report to the tailings and will not be recoverable by flotation. A novel flowsheet to process this ore is proposed here, which represents a parallel low-cost route, along the standard method.This revolves around a two-stage heap leaching process consisting of a high temperature bioleach to extract base metals followed by a precious metals heap leach. This is currently being evaluated through preliminary bench scale test work. The results so far, which will be presented, have been promising.
Showing items related by title, author, creator and subject.
The Adsorption and Elution of Platinum Group Metals (Pt, Pd, and Au) from Cyanide Leach Solutions using Activated CarbonSnyders, C.; Mpinga, C.; Bradshaw, S.; Akdogan, G.; Eksteen, Jacques (2013)This paper investigates the recovery of platinum group metals (PGMs) from a dilute cyanide leach solution containing base metals, in a manner similar to that used for gold extraction in a typical CIP process, and focuses ...
The application of activated carbon for the adsorption and elution of platinum group metals from dilute cyanide leach solutionsSnyders, C.; Mpinga, C.; Bradshaw, S.; Akdogan, G.; Eksteen, Jacques (2013)The research presented in this paper investigated the practical aspects of the recovery of platinum group metals (PGMs) from a dilute cyanide leach solution containing base metals, in a manner similar to that used for ...
Eksteen, Jacques; Mwase, J.; Petersen, J.; Bradshaw, S.; Akdogan, G.; Mpinga, N.; Snyders, C. (2014)The platinum group metals (PGMs) and associated minerals are particularly refractory to most traditional direct leach processes. However, the remoteness of many new ore deposits, socio-political risks, the scarcity of ...