Gold selenium ore usually contains selenium 0.05-0.2%, because selenium is dissolved in cyanide solution, which complicates the cyanidation process (increased cyanide consumption and selenium film on the surface of zinc , making gold difficult to be replaced by zinc) . Therefore, the gold-selenium ore is processed by the following method before extracting gold:
1. For ores containing less than 0.05% selenium, a low concentration cyanide solution should be used for cyanidation to reduce the solubility of selenium. At the same time, when replacing gold with zinc powder, the solution must be increased, preferably by cyanidation with activated carbon. Gold is adsorbed in the solution, and the concentrate can be calcined at 600 to 700 ° C, and the calcination is carried out by cyanidation.
2. For ores containing more than 0.05% selenium, it is best to use a bleaching powder solution to leach selenium from the ore and then recover the gold by cyanidation. Selenium leaching can be carried out by diafiltration and stirring. The percolation bleaching powder consumption is several tens of kilograms per ton of ore, and the recovery rate of selenium is 90%; the consumption of stirring bleaching powder is less, but the recovery rate of selenium can reach 98 to 100%. Available exudate debris precipitated selenium dioxide and iron from the solution.
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