Aluminum Recovery from Domestic Clay.
Mining Conv Session Papers Phoenix Sept 24-26 1984 1984 (10):6 pages
Kaolinitic clays are potentially a vast domestic resource for aluminum. Utilization of this resource could decrease or eliminate the nearly complete dependence of the United States on foreign aluminum raw materials for this important metal. The Bureau of Mines conducted a research and development program to provide technology that would produce a feed of aluminum oxide from clay as a viable substitute for the Bayer alumina now produced from imported bauxite. In addition, the Bureau investigated the possibility of an anhydrous chloride route from clay to aluminum. This route included direct chlorination of clay, purification of the aluminum chloride product, and salt bath electrolysis of the purified aluminum chloride to the metal. The electrowinning step, now known as the ALCOA smelting process, has been commercially proven. Work is continuing on the direct clay chlorination and chloride purification steps to determine if the desired technology can be developed.
Mining Conv. Session Papers, Phoenix, Sept. 24-26, 1984, No. 10. Am. Min. Congr., 6 PP.