A Fundamental Study on the Dissolution Rate of Solid Lime into Liquid Slag

Abstract

Synopsis The rate of dissolu tion of solid lime in to liquid slag was determinedfrom the decrease of diameter of the lime cylillder rotated ill CaO-S iO.-AI ,0 3 or FcO-Ca O-S i02 slag. T he j)enetration of the slag to the solid phase and the distribution of componellts in liquid slag alijacent into the solid-liquid inter.face were examined by the E. P.M.A. technique. The rate of dissolution increased with temperatllre and with rotating s/)eed of Ihe ~ylinder, sllptJorling the assumption that the diffilsioll of cal-cizlln through a slag phase boulldary layer would be the rate-determining step. The dissolution rate into the slag containing FeO was several times greater than thai into slag without FeO , because q{ the differences ill /)hysi-cal /)roperties of slag and ill the morphology of 2CaO · Si0 2 formation. S lag componellts jJellelrated into solid lime Wire maillly AI, O , and FeO, alld the S iO, content was very little. This can be inter/lTeled by the formation of AI , O " or FeO rich slag layer betweell solid lime alld 2CaO· SiO ,jilm.