Abstract
In relation to hot metal pretreatment by soda ash, the vaporization of Na and S from sodium silicate slags has been investigated. At temperatures between 1623 and 1773 K, the slag was melted in a graphite crucible under an atmosphere of argon. The amount of Na and S generated was determined by thermogravimetry and chemical analysis.The rate of Na vaporization from Na2O-SiO2 slag is approximately represented by the first-order-type rate equation. The rate constant increases with increasing slag basicity, i.e. the (%Na2O)/(%SiO2) ratio, and the activation energy varies from 230 to 250 kJ/mol. It is considered that the vaporization would be controlled by the chemical process.Both Na and S evaporate from Na2O-SiO2 slags containing Na2S. Particularly in the acid slag, the most of the mass loss measured is due to the vaporization of Na2S. The vaporization of S is retarded by an increase in the slag basicity, but the reduction of Na2O at an early stage is accelerated by the addition of Na2S to the high basic slag.
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