A new porous nozzles for refining molten aluminum were made from mullite，graphite powder, red mud and sodium silicate. The relationships between graphite content and permeability, sintering parameters and permeability, graphite content and compressive strength were investigated, respectively. The internal structures of the nozzle before and after sintering were observed by SEM. The experimental results show that the permeability of sample can be improved by sintering at temperature of 1000°C for 2 hours. As graphite content increases, the permeability of sample increases, yet the ultimate compressive strength decreases. The compressive strength can be enhanced by using combination of different sizes of mullite particles.