铝热还原制备钛/钛铝合金粉过程含钛冰晶石中钛的赋存状态与分布规律

Occurrence State and Distribution Law of Titanium in Titanium-containing Cryolite during Preparation of Titanium/Titanium-Aluminum Alloy Powder by Aluminothermic Reduction

以氟钛酸钠为原料,经1150℃铝热还原制备钛及钛合金,含钛冰晶石为铝热还原蒸馏阶段的副产物。根据含钛冰晶石蒸气扩散路径,对结晶区不同位置的含钛冰晶石进行取样分析。XRF分析表明:按照含钛冰晶石蒸气流经位置的先后顺序,含钛冰晶石样品中的钛含量(以TiO_(2)计)由10.38%急剧降低至2.70%后基本稳定在0.16%。XPS分析表明:含钛冰晶石中钛主要以TiO_(2)和TiOS的形式存在,二者中的钛占钛总量的70%以上;含钛冰晶石中还含有少量钛的氮化物、氟化物以及钛铝合金。XRD及SEM分析所得含钛冰晶石中钛的赋存状态与XPS分析结果基本一致。

Using sodium fluorotitanate as raw material,titanium and titanium alloys were prepared by alu-minothermic reduction at 1150℃.Titanium-containing cryolite was the by-product in the distillation stage of aluminothermic reduction.Based on the diffusion path of titanium-containing cryolite vapor,sampling and analysis of titanium-containing cryolite at different positions in the crystallization zone were carried out.XRF analysis shows that according to the sequence of the flow location of titanium-containing cryolite vapor,the titanium content(calculated as TiO_(2)) of the titanium-containing cryolite samples decreases sharply from 10.38%to 2.70%and then basically stabilizes at 0.16%.XPS analysis shows that titanium in the titanium-containing cryolite exists mainly in the form of TiO_(2) and TiOS,and the titanium in the two accounts for more than 70%of the total titanium.The titanium-containing cryolite also contains a small amount of titanium nitrides,fluorides and titanium aluminum alloys.The occurrence state of titanium in the titanium-containing cryolite obtained by XRD and SEM analysis is basically consistent with XPS results.