Search Results for: Animal ossein treated with acid
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 furnace with air, steam, and sulfur, which oxidizes the contaminants except silver, gold, and bismuth. the oxidized contaminants are removed by drossing, where they float to the top and are skimmed off. since lead ores contain significant concentrations of silver, the smelted metal...
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