(1. 攀鋼集團研究院有限公司 釩鈦資源綜合利用國家重點實驗室，攀枝花 617000；
2. 中南大學(xué) 化學(xué)化工學(xué)院，長沙 410083；
3. 中南大學(xué) 錳資源高效清潔利用湖南省重點實驗室，長沙 410083；
4. 攀鋼集團重慶鈦業(yè)有限公司，重慶 400055)
摘 要: 為了提高鈦精礦酸解固相物中鈦的浸出率，研究了鈦精礦酸解固相物中鈦浸出動力學(xué)并進行了工業(yè)應(yīng)用試驗。采用單因素浸出實驗研究鈦精礦酸解固相物中鈦的浸出行為規(guī)律，探討液固比、浸出溫度、攪拌轉(zhuǎn)速、浸出液酸濃度等參數(shù)對鈦浸出行為的影響。結(jié)果表明：在水為浸出劑、浸出溫度為65 ℃、浸出液固比1.67:1.00、浸出時間40 min、浸出攪拌轉(zhuǎn)速250 r/min條件下，鈦精礦酸解固相物中鈦的浸出率達到98.04%；動力學(xué)分析發(fā)現(xiàn)，鈦精礦酸解固相物中鈦的浸出過程符合內(nèi)擴散控制的收縮核模型，浸出反應(yīng)的表觀活化能為20.98 kJ/mol。工業(yè)應(yīng)用結(jié)果表明，強化浸出后，鈦總浸出率由96.42%提高至97.51%。
關(guān)鍵字: 鈦精礦；酸解固相物；浸出行為；動力學(xué)
（1. State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Pangang Group Research Institute Co., Ltd., Panzhihua 617000, China;
2. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
3. Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources, Central South University, Changsha 410083, China;
4. Pangang Group Chongqing Titanium Industry Co., Ltd., Chongqing 400055, China）
Abstract:In order to improve the leaching of titanium from the solid phase of acidolysis of titanium concentrate, the leaching kinetics of titanium was studied and the industrial application experiments were carried out. The leaching behavior of titanium was studied by single factor leaching experiment, and the effects of liquid-solid ratio, reaction temperature, stirring speed and acid concentration on titanium leaching behavior were investigated. The results show that the titanium extraction is 98.04% after leaching for 40 min under the conditions of liquid-solid ratio of 1.67:1.00, temperature of 65 ℃ and stirring speed of 250 r/min. The leaching process of titanium is fitted to the shrinkage core model which is jointly controlled by the diffusion of steam through the product layer, and the apparent activation energy calculated is 20.98 kJ/mol. The results of industrial application show that the total leaching rates of titanium increase from 96.42% to 97.51% after enhanced leaching.
Key words: titanium concentrate; solid phase of acidolysis; leaching behavior; kinetics
