... technology, The main technology equipment have dryer,high-pressure roller mill,mixing machine,disc pelletizer,travelling grate,rotary kiln,annular ... 3.Concentrate storage,4.Drying chamber,5.High-pressure roller mill system(obligate),6.Proportioning chamber,7.Mixing chamber,8 ... .Pelletizing building,9.Screening and distribution system,10.Traveling grate-rotary kiln-Annular Cooler system,11.Main ...