How is sulfur dioxide removed from the gases that pass through the fuels of power stations and smelters?

Question

How is sulfur dioxide removed from the gases that pass through the fuels of power stations and smelters?

Answer 1

  

Wet scrubbing using a slurry of sorbent, usually limestone or lime, to scrub the gases.

Spray-dry scrubbing using similar sorbent slurries.



Dry sorbent injection systems.

Answer 2

As sulphur dioxide is an acidic gas it is usually removed by passing it over a cheap base.  Lime (CaO) or Limestone (CaCO3) have both been used for this purpose.