Recovery powder has a bag filter, burn, filter plates and cyclone three. The first two with very little, only the following medium cyclone. Cylindrical upper portion of the cyclone, the lower part is conical. Dusting powder-containing air through the indoor blower to the upper side of the separator inlet duct into the cyclone in a tangential direction, due to the centrifugal force, the powder drops to the bottom cone is recovered. Cyclone air inlet wind speed of 20 ~ 25m / s, the centrifugal force generated by the separable particles less than 5μm. Cyclone performance related to its structure, proved highly increase the recovery efficiency of the cone. However, the height of the cone 2 times the diameter of the cylinder of the recovery efficiency is no longer improved. In actual production, a conventional multi cyclone recovery system unit small, i.e. in parallel with a number of small diameter (6-9) of the cyclone separator, to form a whole. Recovered more effective than dealing with the same big cyclone gas well. But in the design, be sure to make many small cyclone airflow evenly.