PROCESS FOR TRATING MOLYBDENITE CONCENTRATES TO PRODUCE A LUBRICANT GRADE PRODUCT

摘要

1518903 Purification of molybdenum disulphide AMAX Inc 23 April 1976 [1 May 1975] 16618/76 Heading C1A Silica, silicates, pyrites and other gangue is removed from a molybdenite particulate feed by digesting the impure feed with an aqueous solution containing hydrofluoric acid in an amount at least stoichiometically equivalent to the SiO 2 and other constituents capable of reacting with the hydrofluoric acid, and also containing sulphuric acid to maintain a pH of below 2, until the major portion of the contaminants has been dissolved as soluble silicon-containing compounds and any lead present has been converted to lead sulphate; the digested material is separated from the acid solution and washed with water to remove retained acid before neutralizing and drying the washed feed material to obtain molybdenum disulphide powder of lubricant grade.