Abstract
Since 1978, the spent hydrodesulfurizing catalysts come out from oil refineries have been processed at Ako Plant of Taiyo Koko Co., Ltd.Our company presently produces various intermediates of the molybdenum and vanadium; ferro-alloys, chemical pure grade oxides, and ammonium salts, etc. Raw materials for these products are vanadium pentoxide and crude molybdenum trioxide, which mostly are imported from foreign countries but partly recovered from spent catalysts.The recycling plant has been operating smoothly, and the amount of MoO3 and V2O5 recovered from spent catalysts in 1991 were 690 tons, and 855 tons, respectively.
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