METHOD FOR PRODUCING HIGH-PURITY MOLYBDENUM CHEMICALS FROM MOLYBDENUM SULFIDES

摘要

The integrated process of the subject invention is directed to the production of high purity molybdenum chemical products from molybdenum sulfide containing materials by a series of steps, including roasting, sulfuric acid leaching of the calcine to remove impurities from the calcine, ammonia digesting of the calcine to form a pregnant molybdate solution containing dissolved molybdenum, and recovery of the dissolved molybdenum by crystallization and/or molybdic acid precipitation. The process is a "zero discharge" process in that all process waste streams are combined to produce a ferrous ammonium sulfate fertilizer byproduct.