MgO、TiO2对镁质钒钛球团矿综合冶金性能的影响

 以球团厂实际配矿为基础，选取铁矿粉OA、OB、OC和OD，以膨润土作为黏结剂进行试验分析MgO和TiO2对镁质钒钛球团矿冶金性能的影响，并得出合适的TiO2质量分数和MgO质量分数，为生产镁质钒钛磁铁矿球团提供理论依据。结果表明，当[w(MgO)]从1.25%升高到2.34%，球团矿抗压强度从2 511降低到2 453 N/P，还原膨胀指数降低了13.17%；当[w(TiO2)]从3.97%升高到5.07%，球团矿抗压强度从2 511降低到2 383 N/P，还原膨胀指数略有下降，影响较小。球团矿中的[w(MgO)]从1.32%升高到2.38%，球团矿的熔融温度区间降低了40%，改善了其熔滴性能，但MgO固溶体等难还原矿物降低了球团的还原度指数。球团矿综合冶金性能最优的配比参数（质量分数）为OA矿粉50%、OB矿粉21%、OC矿粉10%、OD矿粉19%和膨润土1.8%。

Effects of MgO and TiO2 on comprehensive metallurgical properties of magnesia vanadium titanium pellets

Based onindustrial ore blending,experiments were conducted with 4 kinds of iron ore powders (OA,OB, OC and OD) and bentonite as binder to analyze the effects of MgO and TiO2 on the metallurgical properties of pellets and further to propose the optimal content parameters of TiO2 and MgO,providing the theoretical foundation of produc-tion ofmagnesia vanadium titanium pellets. The results show that as w(MgO) increases from 1.25%to 2.34%,the com-pressive strength of pellets decreases from 2511 N/P to 2453 N/P,and reduction swelling index decreases by 13.17%. A w(TiO2) increases from 3.97%to 5.07%,the compressive strength of pellets decreases from 2511 N/P to 2383 N/P,and reduction swelling index decreasesslightly. As w(MgO) increases from 1.32%to 2.38%,the cohesive zone decreases by 40%,demonstrating a positive influence of MgO on the melt-down property of pellets. The decrease in reducibility of pellets is a result of the increase of hard-to-reduce MgO solid solutions in pellets. The optimal blending parameters of best comprehensive metallurgical properties are OA iron ore powders of 50%,OB of 21%,OC of 10%,OD of 19%, bentonite of 1.8%.