Before revision: The reaction taking place in wet scrubbing using a (limestone) slurry produces calcium sulfite () and may be expressed in the simplified dry form as: + → + When wet scrubbing with a (hydrated lime) slurry, the reaction also produces (calcium sulfite) and may be expressed in the simplified dry form as: + → + When wet scrubbing with a (magnesium hydroxide) slurry, the reaction produces (magnesium sulfite) and may be expressed in the simplified dry form as: + → + To partially offset the cost of the FGD installation, some designs, particularly dry sorbent injection systems, further oxidize the (calcium sulfite) to produce marketable (gypsum) that can be of high enough quality to use in wallboard and other products.
After revision: The reaction taking place in wet scrubbing using a (limestone) slurry produces calcium sulfite () and may be expressed in the simplified dry form as: When wet scrubbing with a (hydrated lime) slurry, the reaction also produces (calcium sulfite) and may be expressed in the simplified dry form as: + → + When wet scrubbing with a (magnesium hydroxide) slurry, the reaction produces (magnesium sulfite) and may be expressed in the simplified dry form as: + → + To partially offset the cost of the FGD installation, some designs, particularly dry sorbent injection systems, further oxidize the (calcium sulfite) to produce marketable (gypsum) that can be of high enough quality to use in wallboard and other products.