International Journal of Minerals, Metallurgy and Materials ( IF 4.8 ) Pub Date : 2020-06-10 , DOI: 10.1007/s12613-019-1903-9 Xiao-hui Li , Jue Kou , Ti-chang Sun , Shi-chao Wu , Yong-qiang Zhao
The formation of calcium titanate in the carbothermic reduction of vanadium titanomagnetite concentrate (VTC) by adding CaCO3 was investigated. Thermodynamic analysis was employed to show the feasibility of calcium titanate formation by the reaction of ilmenite and CaCO3 in a reductive atmosphere, where ilmenite is more easily reduced by CO or carbon in the presence of CaCO3. The effects of CaCO3 dosage and reduction temperature on the phase transformation and metallization degree were also investigated in an actual roasting test. Appropriate increase of CaCO3 dosages and reduction temperatures were found to be conducive to the formation of calcium titanate, and the optimum conditions were a CaCO3 dosage of 18wt% and a reduction temperature of 1400°C. Additionally, scanning electron microscopy-energy dispersive spectrometry (SEM-EDS) analysis shows that calcium titanate produced via the carbothermic reduction of VTC by CaCO3 addition was of higher purity with particle size approximately 50 µm. Hence, the separation of calcium titanate and metallic iron will be the focus in the future study.
中文翻译:
通过添加CaCO 3碳钒还原钛磁铁矿精矿的碳热还原过程中形成钛酸钙
研究了通过添加CaCO 3进行碳钛还原钒磁铁矿精矿(VTC)的碳热还原过程中钛酸钙的形成。被采用的热力学分析由钛铁矿和CaCO的反应表现出的钛酸钙的形成的可行性3在还原性气氛,其中钛铁矿由CO或碳以CaCO的存在下更容易被还原3。在实际的焙烧试验中,还研究了CaCO 3的添加量和还原温度对相变和金属化程度的影响。发现适当增加CaCO 3剂量和降低温度有助于形成钛酸钙,并且最佳条件是CaCO3剂量为18wt%,还原温度为1400℃。另外,扫描电子显微镜-能量分散光谱法(SEM-EDS)分析表明,通过添加CaCO 3进行VTC的碳热还原而生成的钛酸钙具有更高的纯度,其粒径约为50μm。因此,钛酸钙和金属铁的分离将成为未来研究的重点。