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Irkutsk branch of the National Research Institute of rare science shows to be a period of roasting the concentrate was unable to get the lowest arsenic and sulfur cinder. So that further processing will inevitably lose a lot of gold.
Hence the need to develop - kind of guarantee to obtain more suitable for smelting copper smelter products and can be treated in situ extraction of ore and precious metals.
Research by the All-Sugar Nonferrous Metals Institute of Metallurgy and Science and the National Institute of Rare Metals in Irkutsk has shown that two-stage roasting of concentrates that are more complex in the Bidarasong mine can guarantee very A slag suitable for cyanidation and capable of high gold recovery.
The device used in the semi-industrial test is a continuous operation two-stage boiling layer roasting device. The apparatus comprises two successively arranged in the fluidized bed furnace, the hearth area of paragraph 1
It has been tested with a gold - arsenic mixed concentrate from the Dalazon mine . The composition of the concentrate is as follows:
Stage I during firing, firing at a lower temperature and a weak acid in an atmosphere of sublimation during firing â…¡ As segments, the sulfur completely excluded at high temperatures and where the remaining 1 to 2 times more air than the theoretical requirement.
It can be seen from Fig. 2 that the sublimation rate of arsenic is the highest when the air excess ratio is equal to 0.75-1.0 . At this time the tour in the gas    The oxygen is not more than 2% . The desulfurization rate is 57~60% .
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