Abstract
The reduction of nickel oxide in dilute solution in CaO-Al2O3-SiO2 slag by carbon dissolved in iron was investigated using a composite crucible as a container. This method permitted the exclusion of graphite from the system completely. The experimental variables studied to elucidate the reaction mechanism were pressure inside the crucible, carbon content of metal, and NiO concentration in the slag and the slag-metal interfacial area. The experimental results are best explained by postulating the existence of a gas film at the slag-metal interface. The initial fast stage of reduction of nickel oxide takes place simultaneously both by carbon and by iron via an exchange reaction. It is suggested that the rate controlling step for NiO reduction by carbon is a chemical reaction at the gas-slag interface. The exchange reaction is controlled by the mass transport in the gas stirred slag phase.
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