Patent · US Active

Method for recovering molybdenium, nickel, cobalt or their mixtures from used or regenerated catalysts

US7951220B2 · kind B2 · utility

0Cited by
4References
13Claims
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Assignee

Inventors

Key dates

Filing dateMar 25, 2008
Grant dateMay 31, 2011
Priority date—
Expiry dateMar 25, 2028

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY02P10/20
  • WIPO fieldMaterials, metallurgy
  • WIPO sectorChemistry

Abstract

The invention describes a method for recovering molybdenum, nickel, cobalt or their mixtures from used or regenerated catalysts in an electric arc furnace containing a heel of liquid cast iron, surmounted with a fluid slag, comprising the following steps: a) adding used or regenerated catalysts into the heel contained in the electric arc furnace, b) adding dosed lime in order to obtain a slag with a CaO to Al2O3 ratio comprised between 0.7 and 1.3, 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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.