The process of improvement on the slip casting of Bayer-processed alumina was analyzed. The impurity content of Seydişehir alumina plant powder was analyzed using wet chemical analysis. The slip properties of coarse-grained, high-soda-content, alumina powder produced as a byproduct of the Seydişehir aluminum plant were improved by washing, calcining and milling processes and addition of Cr2O3, TiO2, and MgO. Calcination of the powders was performed in a furnace equipped with a controller. Comminution was performed using an attrition mill, a vibratory mill, and a ball mill used in successive steps. It is suggested that to improve the bending strength,, porosity level should be decreased. The slip-casting process should be evaluated under vacuum for the slip and the mold separately. In addition, TiO2 and MgO should be used as sintering aids to increase density and inhibit grain growth simultaneously.