Cyclosizer is a specific instrument for determing the particle size distribution of -0.074mm material. Materials such as pyrite, chalcopyrite, galena, sphalerite, cassiterite, iron ores, gold ores, tailings classification, flotation circuits, silica filters, whiting, clays and soils, prepared chemicals such as alumina, lead sulphate, lead oxide, zinc dust, zinc oxide, silicon carbide, pulverized coal, flyash, magnetite and ferrosilicon, have all been successfully classified using the Cyclosizer. The Cyclosizer has a particular application in the mining and associated mineral process industries for the study and control of classification circuits using equipment based on Stokes' law. Also, in the related field of liberation studies, the Cyclosizer will prepare closely sized fractions in sufficient quantity for chemical analyses, mineralogical assessment and microscopic examination. BXF is an advanced type among our products of Cyclosizer. It can feed samples continuously without stopping working. Additionally, one more cyclone design makes the total number of cyclones up to six, which make it capable to separate samples into seven classes. These classes are 74~54μm, 54~41μm, 41~30μm, 30~20μm, 20~10μm, 10~8μm, -8μm