The soda iron assay method is a unique way to remove the sulfides from the assay or smelt. It uses the metallic iron to reduce the less reactive base metal sulfides to iron sulfide (FeS). The less reactive metals such as copper, lead, tin, arsenic, etc. are reduced to metal and collected in the metallic button. The FeS sulfide is then absorbed by the basic slag that is used leaving only the slag and metallic collector metal button (typically lead). The lead button is then recovered from the slag/cone mold and cupelled to remove all the base metals leaving behind a gold and silver precious metal button. This method is advanagous because no roasting is needed and the sulfide concentrates from a shaker table can be direct smelted without excess preparation or work.
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Complete Smelting Kits:
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15 апр 2020
