Activation pretreatment of low-grade Ti-slag by alkali roasting: anticaking technique and kinetics of decomposition
Meng, Fancheng1,2,3; Wang, Dong1,3; Xue, Tianyan1,3; Wang, Weijing1,3; Liu, Yahui1,3; Qi, Tao1,3
2016
发表期刊ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING
ISSN1932-2135
卷号11期号:1页码:14-23
摘要The caking of roasting products is a serious problem in the activation pretreatment of low-grade Ti-slag by alkali roasting, which could lead to low heat transfer efficiency and low Ti conversion. In this study, an efficient anticaking technique was developed. This technique involved low-grade Ti-slag desilication and anticaking additive introduction. Optimum Ti conversion conditions in alkali roasting with KMnO4 as an anticaking additive were obtained through an orthogonal test. Approximately 99% of titanium in the low-grade Ti-slag could be decomposed at a loosening extent of roasting products of >90% in the presence of 4wt% KMnO4 as an anticaking additive. Kinetic study showed that an unreacted shrinking core model could be used to describe the decomposition of low-grade Ti-slag in alkali roasting with KMnO4 as an anticaking additive. Decomposition kinetics were characterized in two sequential stages: decomposition occurred relatively fast in the initial stage and became slower in the second stage. A mechanism of two-stage decomposition was proposed, i.e.,the reaction rate was controlled by a chemical reaction initially and then was controlled by inner/ash layer diffusion. Apparent activation energies were 53.6kJ/mol in the first stage and 65.9kJ/mol in the second stage, respectively. (c) 2015 Curtin University of Technology and John Wiley & Sons, Ltd.
关键词Kinetics Roasting Additive Anticaking Titanium Slag
文章类型Article
WOS标题词Science & Technology ; Technology
DOI10.1002/apj.1938
收录类别SCI
语种英语
关键词[WOS]MOLTEN-SALT METHOD ; TITANIUM-DIOXIDE ; DISSOLUTION KINETICS ; SODIUM-HYDROXIDE ; ANTI-CAKING ; ILMENITE ; PIGMENT ; NANOPARTICLES ; MECHANISM ; SYSTEM
WOS研究方向Engineering
WOS类目Engineering, Chemical
项目资助者National Natural Science Foundation of China(51090380) ; National Basic Research Program of China (973 Program)(2013CB632604) ; National Science Foundation for Distinguished Young Scholars of China(51125018) ; Key Research Program of the Chinese Academy of Sciences(KGZD-EW-201-2) ; Natural Science Foundation of China(51004091 ; 51104139)
WOS记录号WOS:000368193100002
引用统计
被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/20270
专题湿法冶金清洁生产技术国家工程实验室
作者单位1.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100039, Peoples R China
3.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
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GB/T 7714
Meng, Fancheng,Wang, Dong,Xue, Tianyan,et al. Activation pretreatment of low-grade Ti-slag by alkali roasting: anticaking technique and kinetics of decomposition[J]. ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING,2016,11(1):14-23.
APA Meng, Fancheng,Wang, Dong,Xue, Tianyan,Wang, Weijing,Liu, Yahui,&Qi, Tao.(2016).Activation pretreatment of low-grade Ti-slag by alkali roasting: anticaking technique and kinetics of decomposition.ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING,11(1),14-23.
MLA Meng, Fancheng,et al."Activation pretreatment of low-grade Ti-slag by alkali roasting: anticaking technique and kinetics of decomposition".ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING 11.1(2016):14-23.
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