... fields:1) The fume and smoke treatment and particle removing system in metallurgy plant, alloy plant, steel works, moulding factories, ... tin, zinc, cooper and other rare metals3) Smoke filtration in garbage burning, coal-feed boiler and liquidized laid boilers4) ... Division of liquid, solid and tiny particle recycle in chemicals, coke, carbon, dyestuff, pharmacy and plastics5) Asphalt ...