Removal of Arsenic from Vanadium-chromium Containing Solution by Ferric Salt

According to the higher arsenic content in the leaching solution of roasted vanadium slag produced in steel making with vanadium titanium magnetite from Hongge south mining area,ferric salt was used for arsenic removal to prepare high purity V₂O₅.The effects of initial pH,reaction temperature and time,ratio of Fe and As(w_Fe/w_As),and pH for static settlement on the rates of arsenic removal and vanadium loss were investigated.The results show that the optimum process parameters are as follows:initial pH=3,reaction at 40℃ for 40~50 min with w_Fe/w_As=4~5,then the solution pH is adjusted at 6with NaOH,insulating for 10 min and standing for 12 h.Under the optimum conditions,more than 85% arsenic can be removed with less than 5% of vanadium loss.The content of arsenic in solution is less than 0.08 g/L,and the arsenic content in the obtained V₂O₅(98% purity) is less than 0.01% meeting the standard YB/T 5304-2011.