MgO-C castables were prepared using fused magnesia and four graphite carbon sources,including graphite pellets(PG),coke graphite(CG),electrode graphite(EG) and waste magnesia carbon bricks(MC).The effects of different graphite carbon sources on physical properties,oxidation resistance and slag resistance of castables were studied.The results show that it can significantly improve slag penetration resistance of magenesia-based castables when adding in proper amount of graphite carbon sources.The castables containing PG,CG and EG have lower porosity,higher strength and better oxidation resistance than the castables containing MC.PG and MC which have natural flake graphite are more helpful to improve slag resistance of castables than CG and EG which have low graphitization degree.The uniform distribution of graphite in the form of small flake is very beneficial to slag resistance.
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