... conveying materials (the following reference) cement, sand, lime stone, coal, coke powder, wood chip, crushed ice, cement and urea, ... particles, sulfur yellow powder, resin, calcium powder, potassium sulfate, vulcanization ammonium, graphite, clay powder, quartz sand, iron ore powder, broken slag, ... materials to be carried and the slot ,the powder or particles can be transported smoothly. A suitable ...