Cement rotary kiln is maly used to calce cement clker, it can be divided to dry process and wet process. Metallurgy kiln is maly used to calce lean iron ore, bauxite, alumium hydroxide, chrome ore etc. Lime rotary kiln is used to calce active lime and light roastg dolomite. 2. Rotary kiln Work prciple. Rotary kiln is made of steel plate, and side the kiln body serts refractory lg, which keeps specified clation with horizontal le.