高明磊,薛向欣,王少娜,李兰杰,赵备备,常福增.钛铁矿NaOH水热体系中浸出行为及动力学研究[J].稀有金属材料与工程,2020,49(5):1512~1520.[高明磊,Xue Xiangxin,Wang Shaona,Li Lanjie,Zhao Beibei,Chang Fuzeng.Leaching Behavior and Kinetics of Ilmenite Ore with NaOH Hydrothermal Method[J].Rare Metal Materials and Engineering,2020,49(5):1512~1520.]
钛铁矿NaOH水热体系中浸出行为及动力学研究
投稿时间:2018-12-09  修订日期:2019-02-23
中文关键词:  钛铁矿  NaOH水热法  钛浸出率  浸出行为  动力学
基金项目:
中文摘要:
      为了解决硫酸法生产钛白存在严重的大量硫酸废水污染问题,本文提出了NaOH水热法分解钛铁矿,浸出钛的全新工艺,研究了钛铁矿在NaOH水热体系中分解的行为及动力学。确定最佳的反应条件为:反应温度240℃,NaOH浓度400 g.L-1,液固比3.5:1,氧分压 0.5 MPa,反应时间2 h,搅拌速度600 rpm,粒度 <75μm,钛的浸出率可达到95%以上。通过XRD和SEM表征,确定了钛铁矿的分解行为及钛酸钠的物相组成。通过宏观动力学研究表明,钛铁矿中的钛在NaOH水热体系中氧化分解过程符合未反应收缩核模型,过程速度受产物层扩散控制,计算得到浸出过程的表观活化能为47.39 kJ/mol;钛铁矿在NaOH水热体系中浸出动力学方程为:1-2X/3-(1-X)2/3=[735.09exp(-47389.8/RT)]t。
Leaching Behavior and Kinetics of Ilmenite Ore with NaOH Hydrothermal Method
英文关键词:Ilmenite ore  NaOH hydrothermal method  titanium leaching degree  leaching behavior  kinetics
英文摘要:
      The leaching behavior and kinetics of ilmenite ore with NaOH hydrothermal method was researched in this work, and the innovative metallurgical process for leaching titanium from ilmenite ore is proposed with NaOH hydrothermal method in order to overcome the severe dilute H2SO4 waste water pollution of current titanium extraction process in industry. It is determined that the optimal reaction conditions is as follows: the reaction temperature 240℃, NaOH concentration 400 g.L-1, the mass ratio of alkali to ore 3.5:1, partial oxygen pressure 0.5 MPa, reaction time 2 h, agitation speed 600 rpm, and ore particle size <75μm, and the leaching degree of titanium can reach 95%. Based on XRD analyses and SEM microstructure examination, the decomposition behavior of ilmenite ore was investigated and the generating of sodium titanium particles were observed. The producing phenomenon of the product layer was not found during leaching. The leaching kinetics study shows that the leaching rate of ilmenite ore with NaOH hydrothermal method is controlled by the solid product layer diffusion with the apparent activation energy of 47.39 kJ/mol and an empirical rate equation is “1-2X/3-(1-X)2/3=[735.09exp(-47389.8/RT)]t”.
作者单位E-mail
高明磊 东北大学冶金学院 gaominglei.nsd@163.com 
薛向欣 东北大学冶金学院  
王少娜 中国科学院过程工程研究所  
李兰杰 河钢集团承钢公司钒钛技术研究所  
赵备备 河钢集团承钢公司钒钛技术研究所  
常福增 河钢集团承钢公司钒钛技术研究所  
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