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Name: Sam M.
Status: student
Age: 12
Location: N/A
Country: N/A
Date: 11/14/2004

How would you extract zinc out of zincblende?


The following zinc extraction process is taken from an Inorganic Chemistry Book (London) dated 1939, but the core of the process (Chemistry) is still used today. The zincblende ore is first roasted, and the sulphur dioxide produced from the blende may be utilized in the manufacture of sulphuric acid. External heating has to be applied, the blende being raked in a series of muffle furnaces through which air circulates. Care must be taken so that only the oxide of zinc is produced: 2ZnS + 3O2 = 2ZnO + 2SO2. Some sulfate is always formed and is decomposed at the high temperatures used. The roasted ore is next mixed with half its weight of powdered coal and charged into fireclay retort furnaces. Zinc distills off: ZnO + C = Zn +CO. The reduction begins at 800 degrees and increases rapidly with the rise in temperature. I hope that this helps.


Bob Trach

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