Calcium oxide (CaO) application in 1. The major use of quicklime is in the basic oxygen steelmaking (BOS) process

2. Production of aerated concrete

3. Increase the load carrying capacity of clay-containing soils

4. The production of glass, calcium aluminate cement, and organic chemicals.

5. Food: heat increase; an acidity regulator, a flour treatment agent and as a leavener. E number E529.

6. Light

7. Cement

8. Treatment of drinking water

9. Petroleum industry

10. Paper

11. Plaster

12. Flue- gas desulfurization