Abstract: <FONT face=Verdana>Recovery of vanadium from waste vanadium catalyst mostly adopted acid leaching reduction method.On the basis of this method,the steps of soaking vanadium and extracting vanadium were improved.Optimal process conditions of the recovery of vanadium using solution of P204-TBP-kerosene as extraction liquid had been investigated,which are:after grinded down to about 385 μm,waste vanadium catalyst was soaked by water and reductic acid respectively;it′s lixivium with pH of 1.7 in the phase of water was extracted by solution of 0.7 mol/L P204-7%TBP-kerosene;extraction rate of vanadium reached 99.3% by four steps of extraction for 6 min;back-extraction rate of vanadium reached 99.5% by three steps of back-extraction when time of back-extraction was 15 min and mass concentration of back extractant sulfuric acid was 135 g/L.Quality of vanadium pentoxide (V2O5) gained under those conditions was better than the MB99 Vanadium Pentoxide Standard of GB 3283—1987 and recovery rate of vanadium was above 91.7%.Research results indicated that using P204to extract vanadium from reductic acid soaking solution of waste vanadium catalyst can not only effectively prevent damage to the final products of V2O5 due to high content of arsenic and phosphorus in waste catalyst,but also iron purification was ensured because of extracting at low electric potential.</FONT>