Used extensively in the steel industry to remove impurities during the production of steel. It acts as a flux, combining with silica and other impurities to form slag. Also employed in water treatment to adjust pH and soften water by removing hardness. In construction, it is a key component in the production of cement and mortar. Utilized in the chemical industry as a base for neutralizing acidic materials. Plays a role in flue gas desulfurization to reduce sulfur dioxide emissions from power plants. Commonly used in agriculture to improve soil conditions by reducing acidity.