不同碱渣比对钛渣改性效果影响的研究

Study on the modification effects on different alkaline-to-slag ratio to titanium slag

开展了不同碱渣比对钛渣改性效果的研究,采用XRD、SEM、热力学分析等技术对焙烧产物的微观结构、物相组成进行表征。结果表明,活化焙烧钛渣最优工艺条件为:碱渣比4:6时,在900℃条件下焙烧1h得到的TiO_2品位达96.66%,回收率94.34%。随着改性剂Na_2CO_3添加量的增加,钛渣被活化出的物相增多,碱渣比4:6时物相最多,活化效果最好。结合热力学计算900℃时,G1(FeTi_2O_5)为-138.613k J/mol,G2(MgTi_2O_5)为-87.959k J/mol,G_3(Mg_2SiO_4)为-6.526k J/mol,发生活化反应的顺序为Fe Ti_2O_5>MgTi_2O_5>Mg_2SiO_4,添加改性剂后元素被活化的顺序是Fe>Mg>Si。

The modification effects on different alkaline - to - slag ratio to titanium were studied, and the microstructure and mineral phase composition ofthe roasted product were characterized by XRD, SEM and thermodynamic analysis. The results show that a synthetic rutile with TiO2 grade of 96.66%,recovery of about 94.34% is obtained by activated -roasting under the conditions of mass ratio of N% CO3 to titanium slag of 4：6, most roasted productsare generated and the activation effect is best. Combining the 900℃thermodynamic calculation, A G l （FeTi 05 ）is -138.613 k J/tool, A G2 （MgTi20s ）is - 87. 959kJ/mol, A G3 （ Mg2 SiO4 ） is - 6. 526k J/tool, the order of the activation reaction is FeTi2 05 〉 MgTi2 O3 〉 Mg2 SiO4, the order of the elementsbeing activated after adding modifier is Fe 〉 Mg 〉 Si.