(1. 中南大學(xué) 冶金與環(huán)境學(xué)院，長沙 410083；
2. 中南大學(xué) 難冶有色金屬資源高效利用國家工程實驗室，長沙 410083)
摘 要: 研究不同拜耳法溶出條件下銳鈦礦對氧化鋁溶出性能的影響，并研究不同條件下經(jīng)水熱處理的銳鈦礦對氧化鋁溶出性能的影響。結(jié)果表明：隨著溫度的升高、時間的延長和苛性堿濃度的增加，銳鈦礦對氧化鋁溶出性能的影響逐漸減小甚至消失；經(jīng)水熱處理的銳鈦礦對氧化鋁溶出性能的影響與水熱處理的條件密切相關(guān)，溫度越高、時間越長、鋁酸鈉溶液苛性堿濃度越高，其對氧化鋁溶出性能的影響越小。經(jīng)水熱處理的銳鈦礦的溶解性能實驗和XRD分析結(jié)果表明：不同條件下經(jīng)水熱處理的銳鈦礦對氧化鋁溶出性能的影響存在顯著差別的根源在于其溶解性能和結(jié)晶度存在差別。隨著水熱處理銳鈦礦條件的不斷強(qiáng)化，鈦酸鈉的結(jié)晶度逐漸提高，其在鋁酸鈉溶液中溶解形成鈦酸根離子的濃度逐漸降低，對氧化鋁溶出性能的影響也逐漸減小，甚至完全消失。
關(guān)鍵字: 鈦礦物；氧化鋁；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
