Abstract:Pseudo-boehmite (PB) product was prepared from sintered high-alumina fly ash clinker. Fly ash clinker was pretreated by deep desilication and sintering with soda lime, and twice-desilication solution was decomposed (carbonation decomposition and seed precipitation) to prepare PB. Specific surface areas and pore distribution of PB were analyzed by low-temperature nitrogen adsorption. The results show that adsorption isotherm curve of PB prepared by carbonation and seed precipitation process presents as type Ⅳ. Most of pores between grains are mesopore. Hysteresis loop of adsorption isotherm curve presents as slit pores similar to H4 type. BET specific surface area of carbonation decomposition product is bigger than that of seed precipitation. However, BJH pore volume and BJH pore size are smaller than those of seed precipitation product. Physical chemical indexes of two products are superior to common PB products.