干旱区生态环境知识资源中心(Arid): Long-Term Evolution of Uranium Mobility within Sulfated Mill Tailings in Arid Regions: A Reactive Transport Study

Arid

DOI	10.3390/min11111201
	Long-Term Evolution of Uranium Mobility within Sulfated Mill Tailings in Arid Regions: A Reactive Transport Study
	Seigneur, Nicolas; De Windt, Laurent; Dejeant, Adrien; Lagneau, Vincent; Descostes, Michael
通讯作者	Seigneur, N (corresponding author), PSL Univ, Ctr Geosci, MINES ParisTech, 35 Rue St. Honore, F-77300 Fontainebleau, France.
来源期刊	MINERALS
EISSN	2075-163X
出版年	2021
卷号	11 期号:11
英文摘要	Management of mill tailings is an important part of mining operations that aims at preventing environmental dispersion of contaminants of concern. To this end, geochemical models and reactive transport modeling provide a quantitative assessment of the mobility of the main contaminants. In arid regions with limited rainfall and intense evaporation, solutes transport may significantly differ from the usual gravity-driven vertical flow. In the uranium tailings of the Cominak mine (Niger), these evaporative processes resulted in the crystallization of gypsum, and to a lesser extent jarosite, and in the formation of surface levels of sulfated gypcrete, locally enriched in uranium. We present a fully coupled reactive transport modeling approach using HYTEC, encompassing evaporation, to quantitatively reproduce the complex sequence of observed coupled hydrogeochemical processes. The sulfated gypcrete formation, porosity evolution and solid uranium content were successfully reproduced at the surface and paleosurfaces of the tailing deposit. Simulations confirm that high solubility uranyl-sulfate phase may form at the atmospheric boundary where evaporation takes place, which would then be transformed into uranyl-phosphate phases after being watered or buried under fresh tailings. As these phases usually exhibit a lower solubility, this transition is beneficial for mine operators and tailings management.
英文关键词	uranium mill tailings evaporitic systems reactive transport modeling HYTEC coupled processes geochemistry mineralogy uranium mobility uranyl sulfate
类型	Article
语种	英语
开放获取类型	gold, Green Published
收录类别	SCI-E
WOS记录号	WOS:000723787600001
WOS关键词	GEOCHEMICAL EVOLUTION ; MINE DRAINAGE ; WASTE ROCK ; GROUNDWATER ; SPECIATION ; GYPCRETE ; SOIL ; MINERALOGY ; SURFACE ; WATERS
WOS类目	Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
WOS研究方向	Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/373761
作者单位	[Seigneur, Nicolas; De Windt, Laurent; Lagneau, Vincent; Descostes, Michael] PSL Univ, Ctr Geosci, MINES ParisTech, 35 Rue St. Honore, F-77300 Fontainebleau, France; [Dejeant, Adrien] Sorbonne Univ, Inst Mineral & Phys Mat & Cosmochimie, 4 Pl Jussieu, F-75005 Paris, France; [Descostes, Michael] ORANO Mines, Environm R&D Dept, 125 Ave Paris, F-92320 Chatillon, France
推荐引用方式 GB/T 7714	Seigneur, Nicolas,De Windt, Laurent,Dejeant, Adrien,et al. Long-Term Evolution of Uranium Mobility within Sulfated Mill Tailings in Arid Regions: A Reactive Transport Study[J],2021,11(11).
APA	Seigneur, Nicolas,De Windt, Laurent,Dejeant, Adrien,Lagneau, Vincent,&Descostes, Michael.(2021).Long-Term Evolution of Uranium Mobility within Sulfated Mill Tailings in Arid Regions: A Reactive Transport Study.MINERALS,11(11).
MLA	Seigneur, Nicolas,et al."Long-Term Evolution of Uranium Mobility within Sulfated Mill Tailings in Arid Regions: A Reactive Transport Study".MINERALS 11.11(2021).