A perspective of stepwise utilisation of Bayer red mud: Step-two Extracting and recovering Ti from Ti-enriched tailing with acid leaching and precipitate flotation
A perspective of stepwise utilisation of Bayer red mud: Step-two Extracting and recovering Ti from Ti-enriched tailing with acid leaching and precipitate flotation
复制标题
拜耳赤泥分级利用视角：第二步酸浸沉淀浮选富钛尾矿中提取回收Ti
DOI：
10.1016/j.jhazmat.2016.01.010
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发表时间：
2016-04-15
影响因子：
13.6
通讯作者：
Liu, Jiongtian
中科院分区：
文献类型：
--
作者：
Huang, Yanfang;Chai, Wencui;Liu, Jiongtian
提出了用酸浸沉淀法从富钛尾矿中提取回收钛，作为赤泥分级利用的关键步骤之一。用析因设计法考察了酸浸和沉淀物浮选的影响因素。讨论了Ti4+、Al3+、Fe3+的浸出热力学、动力学以及以[Hbet][Tf2N]为沉淀剂选择性去除Fe3+的机理。在浓H_2SO_4中，Ti4+、Al3+、Fe3+的萃取受扩散反应控制，主要受浸出时间和温度的影响。Ti4+的最大浸出率约为92.3%，而Al3+和Fe3+的浸出率分别为75.8%和84.2%。[Tf2N]作为沉淀剂，在浮选过程中通过配位机制起作用。PH值是影响Ti4+浮选回收率的关键因素，而沉淀剂的用量是影响Al3+浮选回收率的关键因素。Ti4+的最大浮选回收率为92.7%，Al3+的最大浮选回收率为93.5%。钛的提取回收总回收率为85.5%。(C)2016爱思唯尔B.V.保留所有权利。
The extraction and recovery of Ti from Ti-enriched tailing with acid leaching and precipitate flotation, as one of the critical steps, was proposed for the stepwise utilization of red mud. The factors influencing acid leaching and precipitate flotation were examined by factorial design. The leaching thermodynamics, kinetics of Ti4+, Al3+ and Fe3+, and the mechanism of selectively Fe3+ removal using [Hbet][Tf2N] as precipitating reagent were discussed. The extracting of Ti4+, Al3+ and Fe3+ in concentrated H2SO4 is controlled by diffusion reactions, depending mainly upon leaching time and temperature. The maximum extracting efficiency of Ti4+ is approximately 92.3%, whereas Al3+ and Fe3+ leaching are respectively 75.8% and 84.2%. [Hbet][Tf2N], as a precipitating reagent, operates through a coordination mechanism in flotation. The pH value is the key factor influencing the flotation recovery of Ti4+, whereas the dosage of precipitating reagent is that for Al3+ recovery. The maximum flotation recovery of Ti4+ is 92.7%, whereas the maximum Al3+ recovery is 93.5%. The total recovery rate for extracting and recovering titanium is 85.5%. (C) 2016 Elsevier B.V. All rights reserved.