Alloying in the Cast House

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$Large Precast refractory shapes for furnace linings$

% RecoveryTablet Compositions (75 – 100%)• Higher contents give lower unit cost but slower dissolution rates• Optimum product depends on specific cast house operation• In general 80% content will work in most cast houses100Comparison of Mn Additives90807060504030201000 5 10 15 20 25 30Dissolution Time (minutes)MnFlake Mn75ZF Mn80ZF Mn85ZFMQW5 March 2012 14
Alternative Types of Binder• Aluminium powderI. Primary or secondaryII. Aluminium reacts with elements to form intermetallics whicheventually ‘burst’ the compact and then dissolve• FluxI. Normally potassium aluminium fluorideII. Flux dissolves oxide layers on powder to reduce dissolutiontimeIII. Flux melts and releases individual particles into meltIV. Can also be used in conjunction with aluminium powder• Organic binderI. Sometimes used in briquettes with aluminium powderII. Gives high reaction on addition to melt which aids fastdissolutionMQW5 March 2012 15
Page 1 and 2: DIOCESANE PEDAGOGISCHE BEGELEIDINGS
Page 3 and 4: Alloying in the Cast HouseMQW5 Marc
Page 5 and 6: Alternative Methods of AlloyingHigh
Page 7 and 8: Metal CleanlinessReference work on
Page 9 and 10: Mechanisms of Dissolution (simplifi
Page 11 and 12: Tablet DissolutionSwelled CompactsM
Page 13: Types of Alloying TabletsCompositio
Page 17 and 18: • Packaging- Foil, plastic, paper
Page 19 and 20: Conclusions• There is a very wide

Alloying in the Cast House

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