The roasting of straight pyritic ores involves the conversion of the iron sulphides to the oxide under oxidizing conditions with the evolution of sulphur dioxide and, to some extent by catalytic action, sulphur trioxide gas also. In this chemical change the iron mineral is rendered more or less porous, thereby permitting the dissolutio…See more on 911metallurgist
proboardshttps://alluvialgprospectors.proboards/thread/...Roasting black sand help | Alluvial Gold Prospectors
WEBPlace the mixture into a cast iron skillet and heat until mixture is scorching hot and completely dry. Pour the hot concentrates into a plastic bucket or small tub of …
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