Abstract
A rational way to process silver-containing concentrates of the Dukat Mining & Processing Plant has been proposed and justified based on a series of physical and chemical studies and large-scale laboratory and factory tests, which comprises arranging a combined enrichment and metallurgical scheme primarily aimed at obtaining two silver-containing products best meeting the pyro-and hydrometallurgical processing requirements by column flotation. Obtaining a rough silver-gold alloy comprises two basic process operations: redox roasting of concentrate and electric smelting of the roasted product to an internal collector using soda ash as a flux. It has been experimentally established that the concentrate roasting in the oxidizing mode does not allow sufficiently stable extracting noble metals into a compact dore bead by crucible fusion. Adding a reducing agent to the roasting charge has allowed stabilizing the process. Electric smelting is characterized by mechanical loss of silver with a secondary matte phase and in the form of metal beads ranging in size from 5 to 300 μm, which have failed to pass into the bottom phase in the time allotted. The developed technology is universal and allows processing ores with various material compositions.
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