Abstract: In view of too high soluble vanadium in the residue during continuous leaching and filtration of vanadium-bearing clinker using the belt filter in a vanadium plant,simulation and optimization experiments were carried out in laboratory to probe into the effects of particle size of clinker,residue washing times,washing water volume and clinker soaking time on soluble vanadium content in the residue.The results show that soluble vanadium can be lowered below 0.12% with the washing liquid to solid ratio no less than 0.65∶1,residue washing times no less than 3 and soaking period more than 25 min.It can be found from experimental results that the vanadium recovery rates are obviously improved compared with previous production（soluble vanadium percentage of 0.184%～0.324%）.