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Frasch process

Frasch process
The Frasch process is a process for extracting sulfur from sulfur-bearing calcite deposits, invented by Herman Frasch in 1891. Three concentric pipes are lowered down a bore-hole to the ore. Superheated water at 165°C is pumped down the outermost pipe and compressed hot air is blown down the innermost pipe. This forces a frothy mixture of molten sulfur up the middle pipe. Very pure sulfur is produced.

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