spent acid; molybdenum; ammonia neutralization; ammonium molybdate; chemical fertilizer
JAPAN INST METALS
MATERIALS TRANSACTIONS, v. 49, No. 1, Page. 202-207
The present work reports the commercialization of a recycling process of spent acid to recover molybdenum. The process consists of ammonia gas neutralization of spent acid containing molybdenum, crystallization and filtration of ammonium molybdate, roasting and hydrogen reduction of molybdic oxide to produce a commercial grade molybdenum metal powder. The mother liquor, highly nitrogeneous residual solution after the filtration of ammonium molybdate, can be utilized to produce chemical fertilizers.