Patent ID: 7951220
Filing Date: 2011-05-31
Classification: C21C,C22B,Y02P

Abstract:
1. A method for recovering molybdenum, nickel, cobalt or their mixtures from used or regenerated catalysts in an electric arc furnace comprising several electrodes, equipped with a sole and containing a liquid cast iron heel, surmounted with a fluid slag, comprising the following steps: a) adding used or regenerated catalysts containing at least one metal selected from the group consisting of molybdenum, nickel and cobalt, as well as their mixtures, into the heel contained in the electric arc furnace, b) adding dosed lime so as to obtain a slag with a CaO to Al c) mixing the heel by injecting gas so as to avoid formation of crusts, d) melting the used or regenerated catalysts in the electric arc furnace in order to obtain a liquid ferro-alloy.