Role of dodecane on coal particle-bubble interaction in aqueous phase

doi:10.1016/j.molliq.2020.114175

	Role of dodecane on coal particle-bubble interaction in aqueous phase
	Zhang, Zhiqiang 3; Wu, Congshan 3; Yan, Kefeng 1,2
刊名	JOURNAL OF MOLECULAR LIQUIDS
	2020-12-01
卷号	319 页码:7
关键词	Nonpolar hydrocarbon Hydrophobicity Bubble-particle aggregate Liquidlike properties
ISSN号	0167-7322
DOI	10.1016/j.molliq.2020.114175
通讯作者	Zhang, Zhiqiang(donaldzhang@foxmail.com)
英文摘要	Even if coal particles are hydrophobic, interaction between these particles and air bubbles can be enhanced by non polar oil in froth flotation. The role of a nonpolar liquid dodecane on coal partide-bubble interaction in aqueous phase was investigated and compared to that of a solid analogue, paraffin wax via a combined application of water contact angle and particle-bubble stability measurements, and molecular dynamics simulations. It was found both dodecane and paraffin wax can increase hydrophobicity of coal surface and attachment stability of coal particle-bubble aggregates when they covered the coal partides. Despite similar chemical structure and hydrophobicity, dodecane was more effective than paraffin wax. Molecular simulations confirmed that, comparing to the unmodified coal particle, both dodecane and paraffin wax models could increase the attachment strength of coal particle. However, different from immobile solid paraffin wax, we demonstrated that the liquid like properties of the dodecane layers present on the coal particle surfaces play an essential role in the particle-bubble interaction. When the coal particle covered by dodecane arrived at gas-water interface, the dodecane molecules will migrate and rearrange to form a new film at this interface. In addition to hydrophobic attraction of the gas bubble, the dodecane film will provide additional adhesion towards the coal particle due to oleophilicity of the coal particle, enhancing the stability of bubble-particle aggregate. (C) 2020 Elsevier B.V. All rights reserved.
资助项目	National Natural Science Foundation of China[51404162] ; National Natural Science Foundation of China[51974195]
WOS关键词	HYDROPHOBIC SURFACES ; AIR BUBBLES ; FLOTATION ; SEPARATION ; ATTACHMENT ; COLLECTOR ; FILMS ; OILS
WOS研究方向	Chemistry ; Physics
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000583948500049
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.giec.ac.cn/handle/344007/34825]
专题	中国科学院广州能源研究所
通讯作者	Zhang, Zhiqiang
作者单位	1.Guangzhou Key Lab New & Renewable Energy Res & De, Guangzhou 510640, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Energy Convers, Key Lab Gas Hydrate, Guangzhou 510640, Peoples R China 3.Taiyuan Univ Technol, Coll Min Engn, 79 West Yingze St, Taiyuan 030024, Shanxi, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Zhiqiang,Wu, Congshan,Yan, Kefeng. Role of dodecane on coal particle-bubble interaction in aqueous phase[J]. JOURNAL OF MOLECULAR LIQUIDS,2020,319:7.
APA	Zhang, Zhiqiang,Wu, Congshan,&Yan, Kefeng.(2020).Role of dodecane on coal particle-bubble interaction in aqueous phase.JOURNAL OF MOLECULAR LIQUIDS,319,7.
MLA	Zhang, Zhiqiang,et al."Role of dodecane on coal particle-bubble interaction in aqueous phase".JOURNAL OF MOLECULAR LIQUIDS 319(2020):7.