Synergism Extraction of Scandium from Scandium Concentrate and Titanium Dioxide Waste water
Vanadium titanium magnet tailings containing scandium are sorted and enriched to scandium concen-trate with the scandium content of 66.24 g·t-1,and titanium dioxide wastewater containing scandium is collected in Deyang,Sichuan province,its scandium content is 3.661 mg·L-1.After roasting and modification pretreat-ment of scandium concentrate,the titanium dioxide wastewater produced by sulfuric acid process was used as leaching agent for the co-leaching of scandium.The results show that under the conditions of salt-free roasting,roasting temperature of 850 ℃,roasting time of 2.0 h,leaching temperature of 80 ℃,leaching time of 2.0 h,liquid-solid ratio of 8 mL/g,leaching additive of NH4F and leaching additive consumption of 12％,the leaching effect is the best.The leaching rate can reach 83.90％when the scandium content of leaching residue is reduced to 11.50 g·t-1.The results of SEM-EDS and XRD analysis of scandium coarse concentrate,roasted ore and leaching residue show that after roasting and modification,pyroxene and feldspar minerals can effectively decom-pose,creating favorable conditions for the leaching of scandium with titanium dioxide wastewater,and realizing the purpose of synergic strengthening leaching and separation of scandium.Thermogravimetric analysis of scandi-um coarse concentrate shows that there will be two weight-loss phenomena during roasting of scandium coarse concentrate.Thermodynamic analysis during the leaching process proves the feasibility of the reaction.
NETL
NSTL
万方数据
