FIELD: metallurgy.
SUBSTANCE: initial boards are charged into a typical hammer crusher HC-1 with established typical screens. After crushing of boards, crushed fraction is charged to a flotation machine FLM-1. After flotation metal fraction is washed with water and air dried. Further, metal fraction is mixed with potassium tetrafluorobromide in a weight ratio of 1:10, and fused inside a muffle furnace. After cooling, produced melt is dissolved in water. Remaining insoluble material is separated on filter paper, air dried and sent to refining.
EFFECT: extraction of high purity precious metals.
2 ex
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