Abstract
Adding rare earth elements is a potential control method to remove residual elements from molten steel. Influence factors of adding lanthanum to remove arsenic from the molten GCr15 bearing steel have been experimentally studied. The results show that lanthanum addition, the melting temperature, and the initial sulfur content significantly affected the removal of arsenic from molten steel. The reaction of lanthanum with sulfur and arsenic occurred within 4 min after its addition. Reactions between lanthanum and the crucible inhibited the arsenic removal. Increasing the amount of lanthanum and lowering the temperature both are beneficial to arsenic removal from molten steel. Fierce competitions existed among the lanthanum's arsenic removal reaction, the desulfurization reaction, and the lanthanum-crucible reactions. For arsenic removal, the initial sulfur content in molten steel must be controlled within an appropriate range.KeywordsRare earthBearing steelResidual elementCleanliness
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