Calcium sulfite

Calcium Sulfite is a chemical compound with the formula CaSO3. It is a byproduct of flue-gas desulfurization, a process of removing sulfur dioxide from exhaust flue gases of fossil-fuel power plants, and from the emissions of other sulfur-oxide emitting processes.

Chemical Properties

Calcium sulfite is a white crystalline powder. It is soluble in water but insoluble in alcohol. When exposed to air, it oxidizes to calcium sulfate.

Production

Calcium sulfite is produced industrially by the reaction of calcium oxide with sulfur dioxide in a controlled environment. The reaction is highly exothermic and releases a significant amount of heat.

Uses

Calcium sulfite has several uses in various industries. It is used in the paper industry as a filler and in the food industry as a preservative and antioxidant. It is also used in the production of glass and ceramics.

Health Effects

Exposure to calcium sulfite can cause irritation to the eyes, skin, and respiratory tract. Ingestion can lead to gastrointestinal disturbances.

Environmental Impact

Calcium sulfite can have a significant environmental impact. It can contribute to acid rain when it reacts with water and oxygen in the atmosphere to form sulfuric acid.