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Question
what is fractional distillation method for extraction of zinc
what is fractional distillation method for extraction of zinc
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Solution
After reduction (smelting), the impure zinc is then fractionally distilled from the mixture of slag and other metals like lead and cadmium out of the top of the furnace in an atmosphere rich in carbon monoxide which stops any zinc from being oxidised back to zinc oxide.
When distillation is carried out around 1000°c, zinc, Cd, As, etc. distil off leaving Pb and the distillate is then heated to 800°c where Cd and As distill off leaving pure zinc. This sample of Zn is about 99% pure. The zinc can be further purified by electrolysis.
After reduction (smelting), the impure zinc is then fractionally distilled from the mixture of slag and other metals like lead and cadmium out of the top of the furnace in an atmosphere rich in carbon monoxide which stops any zinc from being oxidised back to zinc oxide.
When distillation is carried out around 1000°c, zinc, Cd, As, etc. distil off leaving Pb and the distillate is then heated to 800°c where Cd and As distill off leaving pure zinc. This sample of Zn is about 99% pure. The zinc can be further purified by electrolysis.
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