(1. 中南大学 冶金与环境学院，长沙 410083；
2. 中南大学 难冶有色金属资源高效利用国家工程实验室，长沙 410083)
摘 要: 研究不同拜耳法溶出条件下锐钛矿对氧化铝溶出性能的影响，并研究不同条件下经水热处理的锐钛矿对氧化铝溶出性能的影响。结果表明：随着温度的升高、时间的延长和苛性碱浓度的增加，锐钛矿对氧化铝溶出性能的影响逐渐减小甚至消失；经水热处理的锐钛矿对氧化铝溶出性能的影响与水热处理的条件密切相关，温度越高、时间越长、铝酸钠溶液苛性碱浓度越高，其对氧化铝溶出性能的影响越小。经水热处理的锐钛矿的溶解性能实验和XRD分析结果表明：不同条件下经水热处理的锐钛矿对氧化铝溶出性能的影响存在显著差别的根源在于其溶解性能和结晶度存在差别。随着水热处理锐钛矿条件的不断强化，钛酸钠的结晶度逐渐提高，其在铝酸钠溶液中溶解形成钛酸根离子的浓度逐渐降低，对氧化铝溶出性能的影响也逐渐减小，甚至完全消失。
关键字: 钛矿物；氧化铝；溶出性能；溶解性能
（1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. National Engineering Laboratory for Efficient Utilization of Refractory Non-ferrous Metals Resources,
Central South University, Changsha 410083, China）
Abstract:The effect of anatase on the digestion performance of alumina was investigated under various Bayer digestion conditions as well as the effect of hydrothermal treated anatase under different conditions on the digestion performance of alumina. The results show that the effect of anatase on the digestion performance of alumina gradually decreases or even disappears with the increase of digestion temperature, time and caustic alkali concentration. The effect of hydrothermal treated anatase on the digestion performance of alumina is closely related to the conditions of hydrothermal treatment. The elevated temperature, prolonged time and high caustic alkali concentration are favorable to alleviate the influence. The results of dissolution performance test and XRD analysis indicate that the remarkable distinction of the effect of hydrothermal treated anatase under different conditions on the digestion performance of alumina is due to the difference of dissolution performance and crystallinity. As the conditions for anatase hydrothermal treatment are intensified, the crystallinity of sodium titanate increases and the concentration of dissolved titanate ions in the sodium aluminate solution decreases. Thus, the effect of hydrothermal treated anatase on the digestion performance of alumina gradually decreases or even disappears.
Key words: titanium-containing mineral; alumina; digestion performance; dissolution performance
