Process for the production of ferro-vanadium directly from slag obtained from vanadium-containing pig iron

Abstract

Abstract A PROCESS IS PROVIDED FOR THE PRODUCTION OF FERROVANADIUM FROM SLAG OBTAINED FROM VANADIUM-CONTAINING PIG IRON OR OTHER VANADIUM-CONTAINING MATERIAL, CHARACTERIZED IN THAT THE REDUCTION OF THE SLAG IS CARRIED OUT IN TWO STEPS: (1) IN THE FIRST STEP A REDUCING AGENT IS ADDED IN SUCH AMOUNTS THAT THE SUBSTANTIAL PORTION OF THE IRON OXIDE IN THE SLAG IS SUBSTANTIALLY REDUCED TO METALLIC IRON, WHEREAS PRACTICALLY NONE OF THE VANADIUM OXIDE IS REDUCED; WHEREUPON AFTER REMOVING THE METALLIC IRON FROM THE SLAG, THE FLUID VANADIUM-RICH SLAG IS SUBJECTED TO A FURTHER FINAL REDUCTION STEP (2) BY ADDING A POWERFUL REDUCING AGENT THERETO, SUCH AS SI-RICH FERRO-SILICON IN SUCH AMOUNTS THAT THE REMAINING IRON OXIDE IN THE SLAG AND THE MAJOR PART OF THE VANADIUM OXIDE THEREIN IS REDUCED, AND WHEREBY THE REDUCING AGENT IS ADDED GRADUALLY UNDER CONTINUOUS AGITATION TO AVOID LOCAL CONCENTRATIONS OF THE REDUCING MATERIAL AND THE THUS-OBTAINED FERROVANADIUM IS REMOVED FROM THE SLAG IN A CONVENTIONAL MANNER.

Inventors

• 👤 Helge Aas
• 👤 Rolf Nordheim

Bibliographic Details