Raw Petroleum Coke
Raw petroleum coke, often referred to as "green", is processed in rotary kilns at temperatures ranging well above 2,000°F. This processed petroleum coke is used in the production of aluminum.
Bauxite & Gypsum
Bauxite, gypsum, and many other minerals can be decomposed using calcination in order to remove crystalline water from the material, creating water vapor that can be disposed of easily.
Calcium carbonate (limestone) can be decomposed into calcium oxide (lime) through the calcining process, allowing for its use in cement production.