... when it is a big one.It is separated to three different kind of kiln, cement kiln, metallurgy ... than other part, because it is the part to support the kiln. There are a layer of ... , who makes the material, from preheating chamber easier to move into the kiln.2. Stay ring, with ... harder, so easy to make the round kiln to oval-shaped. Generally speaking, we can add lubricating oil, to ease the situation ...