Abstract: The effects of filling density preheating temperature and additives on the ceramic lined steel pipe made by thermite-gravitational separaion process were studied. It shows that the propagating rate of the combustion wave along the steel pipe decreases with increasing the filling density and increases with increasing the preheating temperature. Furthermore, it becomes contrellable with the addition of suitable additives.The coal powder nozzle produced by thermite-gravitational separation process has been used in blast furnace.The bend pipes with the diameter of 50~273 mm were also produced by this process.