... 45% -20 year experence Guoxin Rotary dryer is widely used for drying materials in industries like cement, mine, building materials, ... of casting, density must achieve 7.3 ~ 7.85 above, accord with # 45 carbon steel standard. Tooth bottom width >the ... new parallel spiral dust collector: it especially designed for the big dust collection . For example, coal slurry, lignite, small particle materials ...