1. Orthoclase, gypsum and limestone for production of aluminum salt and potassium salt;Bakr;Int. Ceram. Rev.,1979
2. Bayer K. J., 1888. A process for the production of aluminium hydroxide. German Patent 43, 977.
3. Historical and technical developments of potassium resources;Ciceri;Sci. Total Environ.,2015
4. Wollastonite as a new kind of natural material (a review);Demidenko;Glas. Ceram.,2001
5. Industrial Minerals and Rocks: Nepheline Syenite;Guillet,1994