Page 17 - Curriculum Visions Dynamic Book

Sulphur as a byproduct
All fossil fuels, as well as many metal ores, produce large volumes
of sulphur-containing gas when they are heated. For a long time natural gas has been the main source of non-Frasch sulphur, because the sulphur had to be removed before the gas could be sold. Other producers of sulphur gases simply released them to the air.
With the tightening of regulations for the emission of sulphur, much of the sulphur required for modern industry is now recovered from fossil fuels by “scrubbing” the smokestack gases as they rise up from power stations and metal refineries that burn copper and lead sulphide ores.
Not only does this collect sulphur efficiently, but it reduces the amount of acid rain in the atmosphere. The extra production of sulphur from these sources has coincided with an increase in demand for sulphur for making fertilisers.
Compressed air
Sulphur
 Sulphur is dried and stored before use.
 The Frasch process of sulphur extraction involves pumping superheated water (water under pressure and heated to above 100°C) into a sulphur-bearing deposit. The sulphur does not react with water, so when it is pumped up to the surface the result is a suspension of sulphur in water. Another word for suspension is mixture.
Sulphur deposit
Area of extraction
Superheated water
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