The carbon-containing gold - arsenic concentrate treatment process (see Figure 2 ) stipulates that carbon shale is pre-separated by flotation, bacterial leaching is carried out on flotation tailings, and cyanidation is carried out on bacterial leaching slag. After 70 hours of bacterial leaching , the arsenic content in the concentrate decreased from 6.6% to 1.0-1.2% , and the arsenic sulfide oxidation rate was 93-95% . When the bacterial leaching residue is adsorbed and cyanated, the gold recovery rate is 92% (for operation); however, when the raw concentrate is cyanated directly without prior leaching of the bacteria, the gold recovery rate is only 5 to 10% . Gold in carbonaceous concentrate obtained by flotation
Laboratory studies have been confirmed by bacterial leaching expansion process tests. Expanded process testing includes trough continuous bacterial leaching, regeneration of bacterial solutions and their return to use. The expanded test results show that the implementation - stage bacterial leaching is more reasonable; in the case of containing carbonaceous materials in the concentrate, it is not necessary to pre-separate the carbonaceous material from the concentrate, and it is possible to directly carry out bacterial leaching on the concentrate. of.
The preliminary technical - economic calculation proves that before the cyanidation of the sulfide ore, the bacterial leaching method is used to dissociate the fine-grained gold, which not only has good dissociation effect, but also is economically reasonable. In the treatment of arsenic-containing concentrates, the bacterial leaching method can avoid the pollution of the atmosphere by toxic gases containing sulfur and arsenic.
The application of the established bacterial leaching process in industrial production not only enables the development and utilization of many new gold deposits, but also enables companies dealing with gold - arsenic ores and other products to significantly increase the recovery rate of gold.
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