Using lime in flue gas purification
Lime is used in a number of different processes to purify wastewater or flue gases. Depending on the process (dry/semi-dry/wet) and the plant requirements, either powdered hydrated lime, quicklime or limestone are used in flue-gas desulphurisation (FGD) plants to keep hazardous emission components such as SO2 (sulphur dioxide), HCL (hydrochloric acid) and HF (hydrogen fluoride) to a minimum.
FGD gypsum, a by-product of the purification process, is used in other areas such as the cement and building materials industries. This helps to conserve natural resources. Contaminants are bound, and the air is kept clean.