The wet scrubbing process was orriginaly developed in the 1930s by Imperial Chemical Industries (ICI) in England.In the modern version of the process, the flue gas is scrubbed with a slurry that contains lime (CaO) and limestone (CaCO3) as well as the salts calcium sulfite (CaSO3 .2H2O)and calcium sulfate (in hydrate form, naturel gypsum, CaSO4 .2H2O).The SO2 in the flue gas reacts with the slurry to form additional sulfite and sulfate salts, which are recycled with the addition of fresh lime or limestone.
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