The aim of the present work was to perform copper, nickel, and platinum group metals (PGMs) recovery from low-grade copper–nickel concentrate containing pyrrhotite, pentlandite, chalcopyrite by bioleaching in stirred tank reactors batch mode subsequent cyanidation. contained (%) Fe 32.7, Cu 0.7, Ni 2.3, Stotal 20.9, Ssulfide 17, 0.1 g/t Pt, 1.35 Pd. performed at 30 40 °C using two different mic...

The microbially mediated recovery of valuable metals contained in mining waste presents an economical alternative to conventional hydrometallurgical processes. In order investigate the effect bacterial adaptation and biological oxidation on bioleaching, bioleaching a pyrrhotite sample from mine waste, with indigenous bacteria existing acid drainage, was studied. were sub-cultured repeatedly for...

Mining has advanced primarily through the use of two strategies: pyrometallurgy and hydrometallurgy. Both have been used successfully to extract valuable metals from ore deposits. These strategies, without a doubt, harm environment. Furthermore, due decades excessive mining, there global decline in high-grade ores. This resulted decrease metal supply, which prompted reconsideration these tradit...

the term biomining have been coined to refer to the use of microorganisms in mining processes as in the biooxidation of refractory gold minerals. the biooxidation of refractory gold ores presents similar characteristics when compared with roasting and pressure oxidation. almost without exception, microbial extraction procedures are more environmentally friendly. the isolated bacteria in this st...

Bioleaching is a proven bioprocess for metal recovery by solution from solid matrices, while a bioprecipitation or biomineralization approach is of potential for biorecovery from solution. Fungi can directly and indirectly mediate the formation of many kinds of minerals, including oxides, phosphates, carbonates and oxalates, as well as elemental forms of metals and metalloids such as Ag, Se and...

Abstract Interest in low-grade Ni-laterite ores has increased recent years; however, the laterite process proven technically difficult and costly, development of alternative low-cost biotechnologies for Ni solubilization been encouraged. In this context, first time, a sample Brazilian ore was subjected to microbial bioleaching using heterotrophic Burkholderia sp. strain. Experiments were perfor...

Ferric ion is a strength oxidant and its precipitation is an undesired phenomenon in the bioleaching process. Previous studies showed that it considerably occurs in bioleaching operations even at optimum conditions. Although there have been many reports on the Fe3+ precipitation, no study has made a mathematical modeling of the affecting parameters. The aim of the present work is the developmen...

Biomining with acidophilic microorganisms has been used at commercial scale for the extraction of metals from various sulfide ores. With metal demand and energy prices on the rise and the concurrent decline in quality and availability of mineral resources, there is an increasing interest in applying biomining technology, in particular for leaching metals from low grade minerals and wastes. Howe...