Experimental Research on the Ion Exchange of Vanadiferous Leaching Solution and Residual Solution Recycling

Based on the clinker of calcifying roasting of stone coal in Hubei Province,the experimental processes involving the acid leaching of roasted clinker,leaching solution impurity removal,ion exchange,supplement to residual solution by sulfuric acid leaching,leaching solution impurity removal again,which had been recycled 12 times,were researched.The concentration of SiO₂,P,Cl^-,SO₄^2-,Na⁺ in residual solution and the variation of leaching percentage of vanadium alone with the recycling times increasing were investigated.The research result indicated that the recycling use of residual solution would not affect the leaching percentage of vanadium significantly,no enrichment of SiO₂ in the solution,certain concentration of P,SO₄^2-,and Na⁺.P and SO₄^2- could be precipitated and removed by lime-neutralization,and Na⁺ would get dynamic balance in the solution and would not affect its recycle.