The desilication effects of aluminum sulfate and sodium aluminate on kraft bamboo pulp during the cooking process were investigated in this study.Furthermore, the residual aluminum ion concentration in the resulting black liquor was measured by inductively coupled plasma at. emission spectrometry (ICP-AES) to evaluate the scaling properties of black liquor during the evaporation process.Atomic force microscopy (AFM) and SEM with energy-dispersive X-ray spectroscopy (SEM-EDS) anal. showed that aluminum salts could react with silica to form a silica-alumina compound, which can adhere to the fiber surface during the cooking process.As a result, the silicon content in the black liquor could be effectively decreased by the addition of aluminum sulfate and sodium aluminate.A silica removal ratio of 74% could be achieved when the loadings of aluminum sulfate and sodium aluminate were 2.0 weight% and 1.5 weight%, resp.Finally, the concentration of aluminum ions was 7.31 ppm under optimized conditions.Based on these considerations, any amounts of aluminum ion passing into the black liquor are unlikely to contribute to scaling problems.