Current status of studies and applications of bacterial pre-oxidation and leaching of refractory gold ores were introduced, and leaching mechanism, process parameters, technological flowsheet and etc.

This paper discusses the reaction mechanism of the bacterial preoxidation and describes the pilot plant test on the bacterial pre oxidation for gold concentrate flotation in Guigang Gold Mine, Guangxi, with stress placed on determination of the technological process for the bacterial preoxidation carbon in pulp gold extractive plant that treats 10 t/d of gold concentrate in Sino Mining Shanxi Ltd.

Structural model of gas-liquid-solid three-phase internal circulating fluidized bed was adopted to design a laboratory-scale airlift bio-reactor used for bacterial pre-oxidation of refractory gold concentrate.

Bacterial pre-oxidation refractory gold ore has showed many advantages,such as low operation cost and environment friendly.

And their bio-oxidation durations are therefore different because of their different distributions in gold-bearing ores.

The result of the experiment shows that after 45 days bio-oxidation,the removing rate of iron of the ore in 0～5mm grain size is 28.

The bio-oxidation as a pretreatme.

Analysis of effective factors of pyrite biooxidation;

Optimization of Biooxidation Pretreatment Process of Hard-to-leach Gold Ore;

The investigations on biooxidation mechanism of sulfides are reviewed, and the model for sulfide biooxidation is introduced.

Research and operations of gold extraction process by bacterial oxidation;

Experimental study on bacterial oxidation of carbon-bearing high arsenic refractory gold concentrate;

Current status of studies on bacterial oxidation and pre-disposal of refractory gold ores;