rigby copper2013 b
DESCRIPTION
TRANSCRIPT
THE USE OF ALUMINA-CHROME REFRACTORIES IN THE HIGH WEAR
AREAS OF ANODE REFINING VESSELS
A. J. Rigby
Harbison Walker Refractories, Cherrington Corporate Center,
400 Fairway DriveMoon Township, Pittsburgh, PA U.S.A.
10mm.
DIRECT BONDED MAGNESIA-CHROME
10mm.
REBONDED FUSED MAGNESIA-CHROME
REBONDED FUSED GRAIN CONVERTER TUYERE BRICK
MAGNESIA-CHROME BRICK FROM AN ANODE REFINING VESSEL
ALUMINA-CHROMIA REFRACTORY• AREAS OF SEVERE WEAR IN CONVERTER AND
ANODE VESSELS GENERALLY DUE TO PENETRATION AND SPALLING OF ALTERED BRICK
• IMPROVEMENTS IN REFRACTORY LIFE WILL BE DICTATED BY REDUCING OR ELIMINATING THIS PENETRATION
• LABORATORY TESTING CANNOT REPLICATE THESE WEAR MECHANISMS
ANODE REFINING VESSEL REFRACTORY ISSUES
• WEAR AREAS AT THE TUYERES, SKIMMING MOUTH AND TAPHOLE
• TYPICALLY NEED MAINTENANCE EVERY 3-4 MONTHS
• SPECIFICALLY FOR THREE VESSELS DOWNTIME TO REPAIR REQUIRES 8-9 WEEKS OF LOST PRODUCTION (IF THERE IS NO SPARE VESSEL)
ALUMINA-CHROME CASTABLE CONTAINING 30% Cr2O3 WITHCuO AT 1400oC FOR 5 HOURS
ALUMINA-CHROME CASTABLE CONTAINING 30% Cr2O3
ANODE MOUTH OVERLAY
REPLACEMENT OF REBONDED FUSED GRAIN MAGNESIA-CHROME BRICK BY ALUMINA-CHROME GAVE UP TO 250% PERFORMANCE INCREASE
INCREASED PRODUCTION IN THE PLANT OF ~16,000MT OF ANODE COPPER
EVIDENCE THAT HIGHER CHROMIC OXIDE LININGWILL FURTHER IMPROVE LINING LIFE
NO EVIDENCE OF ANY INCREASE DEVELOPMENTOF SOLUBLE CHROME DURING USE IN COMPARISON TO MAGNESIA-CHROME
CONCLUSIONS
MOST SEVERE AREAS OF WEAR IN ANODE REFININGVESSELS WILL BENEFIT BY 2-2.5 TIMES IMPROVEMENTUSING ALUMINA-CHROME REFRACTORY
REDUCED DOWNTIME CAN ALLOW FOR SIGNIFICANTPRODUCTION INCREASE
ALUMINA-CHROME NOW IN USE IN SLAGLINE OF SECONDARY RECYCLING FURNACES AND SHAFTSPENT ANODE REMELTING FURNACES.