... material, metallurgy and chemical, The mainly drying material are coal slurry , lignite, coal powder, slag, clay stone, chicken manure, sand, sawdust etc ... a source of heat. the material to combustion can be: coal, wood and other solid fuel.Number 2, feeding device: it ... must achieve 7.3 ~ 7.85 above, accord with # 45 carbon steel standard. Tooth bottom width >the width of the tooth ...