Lime is the most used reagent in the world for treating combustion gases from waste and biomass incinerators, from many industrial plants and from thermal power plants. Its flexibility is also evident in the fact that it can be used, in dry, semi-dry and wet processes.
- Desulphurisation: is the treatment to remove SOx from combustion gas (predominantly from coal-fired power plants), which is realised mainly with wet systems containing lime or calcium carbonate. Hydrated calcium sulphate is obtained as a residue, that is, common gypsum which is used in the construction industry.
- Waste-to-energy plants: thermal destruction of waste generates both gases rich in polluting acids, such as HCl, SOx and HF, and organic gases such as dioxins. Lime is the most versatile and easy to use reagent for neutralising acids in full respect of the increasingly restrictive legal limitations.
- Glass and ceramic industries: plants with gases mainly characterised by SOx and HF, acid pollutants that can be removed easily with lime with high efficiency and low consumption.
- Cement plants: high concentrations of SOx that characterise gases from cement plants can be successfully reduced by using lime, both in traditional gas flues and in the furnace.
- Steel mills and foundries: melting scrap metal often leads to the formation of acid pollutants and organic micropollutants in flue gas that can be abated using lime and active carbon.