干旱区生态环境知识资源中心(Arid): Water recovery improvement by shearing of gravity-thickened tailings for cemented paste backfill

Arid

DOI	10.1016/j.jclepro.2019.118882
	Water recovery improvement by shearing of gravity-thickened tailings for cemented paste backfill
	Jiao Huazhe 1; Wang Shufei 1; Yang Yixuan 2; Chen Xinming 1
通讯作者	Jiao Huazhe
来源期刊	JOURNAL OF CLEANER PRODUCTION
ISSN	0959-6526
EISSN	1879-1786
出版年	2020
卷号	245
英文摘要	In mines present in water-scarce areas, the high-water recovery from paste and thickened tailings results in significant cost savings as compared to recovery from conventional tailings. However, it is difficult to dewater tailings with fine particles. In this study, a pilot-scale thickening test was conducted to improve the underflow concentration by rake shearing. The tailing bed was analysed with computed tomography. The porosity and connectivity were determined using a pore network model (PNM) to explain the dewatering enhancement due to shearing. The results show that the underflow concentration increases from 62.3 wt% to 68.6 wt% when the shear rate of the rake is 2 rpm. The porosity decreases from 47.26% to 40.19% due to shearing, representing a decrease by 14.96%. The connectivity of the pores decreases by 8.9% due to shearing. The pore spaces can be divided into 'balls', representing the water storage, and 'stick' throats, representing the pore connection in the PNM. The numbers of balls and sticks after shearing decrease by 16.59% and 24.01%, respectively. The concept of the ball-to-stick ratio (BSR) was proposed for a pore structure characterisation. The BSR increases by 20.76% after shearing, which indicates that the drainage occurs in the stick spaces rather than the ball spaces. A case study was conducted in Jiashi Copper Mine in the Taklimakan Desert, which is one of China's most arid areas. The underflow concentration reached 70-72 wt% by improving the picket quantity and height. Based on the thickened tailing system, 14 mio t of water can be saved per year and a water recovery of 57% can be obtained. Therefore, paste and thickened tailing technology can be used for the disposal of tailings in arid areas. (C) 2019 Elsevier Ltd. All rights reserved.
英文关键词	Water recovery Paste and thickened tailings Gravity thickening Shearing Computed tomography Pore network model
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000503739400121
WOS关键词	YIELD-STRESS ; KAOLINITE ; WASTE ; BEHAVIOR ; DENSITY ; MODEL ; MINE ; COAL
WOS类目	Green & Sustainable Science & Technology ; Engineering, Environmental ; Environmental Sciences
WOS研究方向	Science & Technology - Other Topics ; Engineering ; Environmental Sciences & Ecology
EI主题词	2020-02-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/312777
作者单位	1.Henan Polytech Univ, Sch Civil & Engn, Jiaozuo 454000, Henan, Peoples R China; 2.Henan Polytech Univ, Inst Recourses & Environm, Jiaozuo, Henan, Peoples R China
推荐引用方式 GB/T 7714	Jiao Huazhe,Wang Shufei,Yang Yixuan,et al. Water recovery improvement by shearing of gravity-thickened tailings for cemented paste backfill[J],2020,245.
APA	Jiao Huazhe,Wang Shufei,Yang Yixuan,&Chen Xinming.(2020).Water recovery improvement by shearing of gravity-thickened tailings for cemented paste backfill.JOURNAL OF CLEANER PRODUCTION,245.
MLA	Jiao Huazhe,et al."Water recovery improvement by shearing of gravity-thickened tailings for cemented paste backfill".JOURNAL OF CLEANER PRODUCTION 245(2020).