A method of zone refining was applied to purify the industrial yellow phosphorus to obtain ultra-pure phosphorus. The influence of variable zone lengths, zone passes, moving speed and the impurity of raw materials on the purification process was studied. The results indicated that after 5 zone passes, the 12 impurities’ (Fe, Ca, Co, Mg, Cr, Cd, Mn, Ni, Cu, Pb, Zn, Al) content reached to the level of 6 N (99.9999%) except arsenic under the conditions of moving speed 10 mm/h, zone length 0.1L and the arsenic content of raw material 14301 ng/g. After 30 zone passes, the amount of impurities were about 100 ng/g, which could satisfy the demands of semiconductor and pharmaceutical industries.
