"A rotary kiln is a pyroprocessing device used to raise materials to a high temperature (calcination) in a continuous process. Materials produced using rotary kilns include:
1. Cement
2. Lime
3. Refractories
4. Metakaolin
5. Titanium dioxide
6. Alumina
7. Vermiculite
8. Iron ore pellets
They are also used for roasting a wide variety of sulfide ores prior to metal extraction."
