Activation pretreatment of low-grade Ti-slag by alkali roasting: anticaking technique and kinetics of decomposition

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	Activation pretreatment of low-grade Ti-slag by alkali roasting: anticaking technique and kinetics of decomposition
	Meng, Fancheng1,2,3 ; Wang, Dong 1,3; Xue, Tianyan 1,3; Wang, Weijing 1,3; Liu, Yahui 1,3; Qi, Tao 1,3
刊名	ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING
	2016
卷号	11 期号:1 页码:14-23
关键词	kinetics roasting additive anticaking titanium slag
ISSN号	1932-2135
英文摘要	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.
WOS标题词	Science & Technology ; Technology
类目[WOS]	Engineering, Chemical
研究领域[WOS]	Engineering
关键词[WOS]	MOLTEN-SALT METHOD ; TITANIUM-DIOXIDE ; DISSOLUTION KINETICS ; SODIUM-HYDROXIDE ; ANTI-CAKING ; ILMENITE ; PIGMENT ; NANOPARTICLES ; MECHANISM ; SYSTEM
收录类别	SCI
语种	英语
WOS记录号	WOS:000368193100002
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/20270]
专题	过程工程研究所_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
推荐引用方式 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.