Minimizing pest aluminum in magnesium for the production of high-purity titanium  

作　　者：Bo Yang Rui Zheng Ge Wu Zhi-Min Chang Zhi-Wei Shan 

机构地区：[1]Engineering Research Center for Magnesium-based New Materials,Center for Advancing Materials Performance from the Nanoscale(CAMP-Nano),State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710049,PR China

出　　处：《Journal of Magnesium and Alloys》2023年第11期4189-4196,共8页镁合金学报（英文）

基　　金：the support from the National Natural Science Foundation of China (No.52031011);funding from the Science and Technology Departments of Shaanxi and Xi’an,China (Nos.2021GXLH-Z-015,2016KTZDGY-04-04 and 201805064ZD15CG48)。

摘　　要：It is practically difficult to find titanium sponges with low and stable aluminum impurities on the market even though it is the precondition to prepare high-purity titanium. Analysis indicates that almost all the aluminum impurities in the titanium sponge are inherited from the magnesium used to reduce titanium tetrachloride. However, it remains elusive for decades why magnesium produced through the silicothermic reduction method contains a high content of aluminum impurities with large fluctuations. By recourse to thermodynamic calculations and comparative experiments, we demonstrate that fluorite, a material used as a catalyst in the silicothermic reduction method to produce magnesium, is the chief culprit for the pest aluminum and propose a mechanism to rationalize the observed phenomena. Our findings indicate that one practical way to produce qualified magnesium for the production of high-purity titanium is to abandon fluorite during the production of magnesium with the silicothermic reduction method.

关 键 词：High-purity titanium Titanium sponge MAGNESIUM Aluminum impurity Silicothermic reduction 

分 类 号：TG146.23[一般工业技术—材料科学与工程]