Options in the Hcl Process for the Production of Alumina from Clay.
Shanks-DE; Thompson-DC; Arington-RM; Et Al
Paper in Light Metals 1986 :25-33
The Bureau of Mines has conducted in-depth studies on the recovery of aluminum chloride hexahydrate and alumina from domestic kaolinitic clay. The original goal of the studies was to provide the technology for alumina production from domestic raw materials. Current research is focused on process modifications that would improve the economics of clay-hcl leaching and improve chances for transfer of the technology to commerical use. Options under investigation include direct leaching of raw clay, changes in leaching acid concentration and stoichiometry, decreased leaching duration, improved solid-liquid separations, elimination of solvent extraction for iron removal, and formation of basic aluminum chloride instead of aluminum chloride hexahydrate as an intermediate product. Implementation could decrease energy, equipment, and reagent costs by eliminating the calcination step, substituting filtration for thickening and washing circuits, and combining iron removal with aluminum chloride crystallization.
Paper in Light Metals 1986, Metall. Soc. AIME, Warrendale, Pennsylvania, 1986, PP. 25-33