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a coke-fired blast furnace to the metal. additional layers separate in the process and float to the top of the metallic lead. these are slag (silicates containing % lead), matte (sulfides containing % lead), and speiss (arsenides of iron and copper). these wastes contain concentrations of copper, zinc
, cadmium, and bismuth that can be recovered economically, as can their content of unreduced lead. metallic lead that results from the roasting and blast furnace processes still contains significant contaminants of arsenic, antimony, bismuth, zinc, copper, silver, and gold. the melt is treated in a reverberatory...
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