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Description
It is a silvery-gray crystalline solid substance. It is insoluble in water and denser than water. It easily penetrates the soil to contaminate groundwater and nearby waterways. Contact may mildly irritate skin, eyes, and mucous membranes. It may be mildly toxic by ingestion, inhalation and skin absorption. Lead can be produced pyro-metallurgically or hydro-metallurgically, depending on the type of ore used as a charge. In the pyro-metallurgical process, ore concentrate containing lead, zinc, or both is fed, in some cases after sintering, into a primary smelter. Lead concentrations can be 50-70%, and the sulfur content of sulfidic ores is in the range of 15-20%. Ores with a mixture of lead and zinc concentrate usually have lower respective metal concentrations. During sintering, a blast of hot air or oxygen is used to oxidize the sulfur present in the feed to sulfur dioxide (so2).
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Lead concentrates
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