干旱区生态环境知识资源中心(Arid): Impact of magnesium on the flocculation, sedimentation and consolidation of clay-rich tailings in lime-treated seawater

Arid

DOI	10.1016/j.seppur.2023.125633
	Impact of magnesium on the flocculation, sedimentation and consolidation of clay-rich tailings in lime-treated seawater
	Nieto, Steven; Toledo, Pedro G.; Robles, Pedro; Quezada, Gonzalo R.; Jeldres, Ricardo I.
通讯作者	Jeldres, RI
来源期刊	SEPARATION AND PURIFICATION TECHNOLOGY
ISSN	1383-5866
EISSN	1873-3794
出版年	2024
卷号	332
英文摘要	The sustainability of the mining industry in times of climate change, especially in arid regions, rests on seawater. However, now more than ever, it is necessary to optimize processes regarding water consumption and increase recovery and recirculation, including water trapped in tailings dams. Seawater also offers challenges, for example, the condition in which it must be used. This study examines the effects of raw seawater (SW) and limetreated seawater to reduce Mg content (TSW) under strong alkaline conditions (pH 11) on the flocculation, sedimentation, and consolidation of flocculated quartz-kaolin suspensions using a high molecular weight anionic polyacrylamide as a flocculant. The presence of magnesium precipitates in SW, mainly magnesium hydroxide, leads to sedimentation rates of flocculated quartz-kaolin suspensions considerably lower than in TSW because the aggregates in SW are smaller than in TSW, according to chord size analyses. The precipitates interfere in the flocculant-particle interaction, limiting the adsorption of the flocculant and its ability to form bridges of any kind, polymeric or salt, with the tailings particles. However, Mg precipitates act as short-range and limited extension binders compared to flocculants increasing the resistance of the aggregates much more in SW than in TSW in processes without and with flocculant, whether it is measured as yield stress, elastic moduli, or compressive yield stress. Thus, the new result is that Mg precipitates are responsible for most of the resistance to consolidation of quartz-kaolin suspensions and, therefore, should be avoided. Therefore, TSW should be the choice to facilitate water clarification in thickeners and water recovery from the consolidation of deformable tailings aggregates.
英文关键词	Seawater Magnesium precipitates Rheology Clay-based tailings Consolidation
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001133297500001
WOS关键词	COMPRESSIVE YIELD-STRESS ; KAOLINITE ; DESALINATION ; SUSPENSIONS ; BEHAVIOR ; ALUMINA ; CATIONS ; FORCES ; SIZE
WOS类目	Engineering, Chemical
WOS研究方向	Engineering
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/405626
推荐引用方式 GB/T 7714	Nieto, Steven,Toledo, Pedro G.,Robles, Pedro,et al. Impact of magnesium on the flocculation, sedimentation and consolidation of clay-rich tailings in lime-treated seawater[J],2024,332.
APA	Nieto, Steven,Toledo, Pedro G.,Robles, Pedro,Quezada, Gonzalo R.,&Jeldres, Ricardo I..(2024).Impact of magnesium on the flocculation, sedimentation and consolidation of clay-rich tailings in lime-treated seawater.SEPARATION AND PURIFICATION TECHNOLOGY,332.
MLA	Nieto, Steven,et al."Impact of magnesium on the flocculation, sedimentation and consolidation of clay-rich tailings in lime-treated seawater".SEPARATION AND PURIFICATION TECHNOLOGY 332(2024).