Synopsis:The rate of dissolution of CaO into liquid slag was determined by measuring the decrease of diameter of rotating CaO cylinder dipped in CaO-SiO2-Al2O3 or FeO-CaO-SiO2 slag and the penetration of slag was examined. Also, the distribution of components in liquid slag adjacent to the solid-liquid interface was examined by the XMA technique.The rate of dissolution increased with temperature and with rotating speed of the cylinder and was expressed by the rate equation derived from the assumption that the rate was controlled by mass transport in the boundary layer of liquid slag. The dissolution rate into liquid slag containing FeO was several times greater than that into slag without FeO, bacause of the difference of physical properties of slag and, probably, of the difference of the mode of 2CaO.SiO2 formation.Slag components penetrated into solid CaO were mainly Al2O3 and FeO and the SiO2 content was very little. This may be explained by the formation of Al2O3 or FeO rich slag layer between solid GaO and 2CaO.SiO2 film.
SynopsisCylinders of burnt dolomite with the apparent porosities of 20 to 35 were immersed into molten FetO-CaO--Si02 slaps at temperatures of 1 950 to 1 425 °C and rotated at 100 to 400 rpm. The dissolution rates were determined by measuring the decrease in radius of cylinder.The dissolution rate increased with increases in temperature and revolutional speed of cylinder, but was not affected by the difference in apparent porosity of burnt dolomite. From the analysis of experimental results, it was concluded that the dissolution rate was controlled by the mass transport of CaO in burnt dolomite for low FetO slag (slag A) and that of MgO for other slaps in the boundary layer of molten slag. Mass transport coefficients calculated were in the range of 4.7 X 10-4 to 1.7 X 10 3 cm Js at 1400 °C.It was found that the burnt dolomite after the experiment was widely covered with (Fe, Mg) 0 solid solution in the case of high FecO slag.
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 solidliquid 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 calcizlln 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 /)hysical /)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.
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