Recovery of fluorine from bastnasite as synthetic cryolite by-product

Wang, Liangshi; Wang, Chunmei; Yu, Ying; Huang, Xiaowei; Long, Zhiqi; Hou, Yongke; Cui, Dali

doi:10.1016/j.jhazmat.2011.12.069

Cited by 68 publications

(13 citation statements)

References 26 publications

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“…These new technologies significantly reduce the chemical consumption and waste discharge in rare earth separation. To comprehensively exploit the values of bastnaesite, creating additional values from rare earth resources, new environment-friendly processes for the separation and the recovery of thorium and fluorine from the bastnaesite treatment were developed [19][20][21]. Many patents are obtained, and among them, some are granted internationally and achieve remarkable economic and social benefits.…”

Section: Recent Developments In Rare Earth Cleaner Hydrometallurgymentioning

confidence: 99%

Technology development for rare earth cleaner hydrometallurgy in China

et al. 2015

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China is the global leader in rare earth (RE) production using hydrometallurgical processes. Advantageous extraction techniques of rare earths from Baotou mixed rare earth minerals, bastnaesite, and ion-adsorption clays of rare earth deposits have been developed in China. The separation and purification technologies have also achieved rapid development. The industrial application processes for rare earth hydrometallurgy were summarized in the present paper. With the large demands and rapid development of rare earths, the issues of resources and environment are more prominent. This review gives an overview of the main processes that were developed in the past toward greener hydrometallurgy of rare earths in China. Based on the development of the rare earth industry, comprehensive utilization and cleaner production should still be focused on in the future, to support the sustainable development.

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Section: Recent Developments In Rare Earth Cleaner Hydrometallurgymentioning

confidence: 99%

Technology development for rare earth cleaner hydrometallurgy in China

et al. 2015

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“…In the recent years, various methods have been investigated to remove or recover fluoride from wastewater, such as chemical precipitation [5], adsorption [6,7], ion exchange [8], electrocoagulation [9], and membrane filtration [10]. Among these methods, the sludge produced by chemical precipitation cannot be reused due to low fluoride content, which is difficult to be treated with high water content.…”

Section: Introductionmentioning

confidence: 99%

Fluoride recovery using porous calcium silicate hydrates via spontaneous Ca2+ and OH− release

Guan

Zhao

2016

Separation and Purification Technology

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“…The literature is somewhat diverse on this point. Chen et al reported that, at a 1:1 ratio, aluminium hydroxyfluoride precipitation dominates over cryolite, although only at pH 5.5 [49], whereas Jiang and Zhou predicted favourable cryolite recovery at the same ratio at pH 9 [50] and Wang et al demonstrated success using a F − /Al 3+ molar ratio 27.9 ± 0.6 of ~ 1:2.55 (although this was achieved by neutralisation of an acidic starting solution) [51]. We have considered the molar ratio monitoring and potential adjustment in previous work [29].…”

Section: La-mts9501 Column-elution Behaviourmentioning

confidence: 99%

Development of a Combined Leaching and Ion-Exchange System for Valorisation of Spent Potlining Waste

Robshaw

Bonser

Coxhill

et al. 2020

Waste Biomass Valor

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This work aims to contribute to addressing the global challenge of recycling and valorising spent potlining; a hazardous solid waste product of the aluminium smelting industry. This has been achieved using a simple two-step chemical leaching treatment of the waste, using dilute lixiviants, namely NaOH, H 2 O 2 and H 2 SO 4 , and at ambient temperature. The potlining and resulting leachate were characterised by spectroscopy and microscopy to determine the success of the treatment, as well as the morphology and mineralogy of the solid waste. This confirmed that the potlining samples were a mixture of contaminated graphite and refractory materials, with high variability of composition. A large quantity of fluoride was solublised by the leaching process, as well as numerous metals, some of them toxic. The acidic and caustic leachates were combined and the aluminium and fluoride components were selectively extracted, using a modified ion-exchange resin, in fixed-bed column experiments. The resin performed above expectations, based on previous studies, which used a simulant feed, extracting fluoride efficiently from leachates of significantly different compositions. Finally, the fluoride and aluminium were coeluted from the column, using NaOH as the eluent, creating an enriched aqueous stream, relatively free from contaminants, from which recovery of synthetic cryolite can be attempted. Overall, the study accomplished several steps in the development of a fully-realised spent potlining treatment system. Graphic Abstract

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Recovery of fluorine from bastnasite as synthetic cryolite by-product

Cited by 68 publications

References 26 publications

Technology development for rare earth cleaner hydrometallurgy in China

Technology development for rare earth cleaner hydrometallurgy in China

Fluoride recovery using porous calcium silicate hydrates via spontaneous Ca2+ and OH− release

Development of a Combined Leaching and Ion-Exchange System for Valorisation of Spent Potlining Waste

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