The lime is derived from the calcination of limestone. CaCO3 + heat → CaO + CO2 ↑ Then if hydrated, exotherm reaction is generated and lime is produced. CaO + H2O → Ca (OH) 2 + 15 kcal
The most common use of lime, which is the metallurgical, where it is used as a flux agent for removing impurities (silicon, phosphorus and sulfur) in the refining of steel.
Also used for the production of other metals, such as enrichment of copper, production of aluminum and magnesium, export of uranium and repairing gold and silver.