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Reactive extraction of sodium hydroxide from alkali solutions for the separation of sodium and aluminum - Part I. Effect of extractant
Zhang, Ying1; Zheng, Shili1; Wang, Xiaohui1; Du, Hao1; Fang, Zhigang Zak2; Zhang, Yi1
2015-04-01
Source PublicationHYDROMETALLURGY
ISSN0304-386X
Volume154Issue:APRPages:47-55
Abstract

Enhanced separation of sodium and aluminum in Bayer spent liquor has been a challenge of the alumina industry for decades in its effort to obtain a stream of caustic solutions with high MR (molar ratio of Na2O to Al2O3) to treat red mud. The existing methods are too energy-intensive to use in practice. Solvent extraction technology has attracted considerable attention owing to its high selectivity and efficiency. However, the extraction capacities of extractants as reported in the literature are insufficiently high, requiring multiple-stage extraction and high organic-to-aqueous phase ratio. In this paper, the mechanisms for the extraction of sodium from Bayer liquor using alkyl phenol weak organic acids are investigated in terms of their structures and acidities, and an optimized extractant consisting of 2-tert-butyl-4-methylphenol dissolved in 1-octonal was selected due to its high sodium extraction capacities. The equilibrium relations between equilibrated organic sodium concentration and aqueous alkaline concentration for sodium extraction from sodium aluminate solutions under different concentrations of organic acid at various temperatures were systematically investigated. The equilibrium data obtained using 1 mol/L 2-tert-butyl-4-methylphenol diluted by 1-octonal at 40 degrees C for extraction and stripping were used to design the extraction parameters to achieve a sodium extraction efficiency of 50%. The results of the extraction of a two-stage countercurrent experiment in laboratory scale verified the design parameters. Sodium extraction efficiency of 40.4% was achieved. Concurrently near-pure alkaline solution with about 210 g/L NaOH was obtained from the stripping unit, which could be evaporated to treat red mud. (C) 2015 Elsevier B.V. All rights reserved.

KeywordReactive Extraction Sodium Hydroxide Sodium Aluminate Solution Alkyl Phenol Organic Acid Equilibrium Curve
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.hydromet.2015.03.013
Indexed BySCI
Language英语
WOS KeywordCARBOXYLIC-ACIDS ; TEMPERATURE
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000355709600007
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/19267
Collection湿法冶金清洁生产技术国家工程实验室
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
2.Univ Utah, Dept Met Engn, Salt Lake City, UT 84112 USA
Recommended Citation
GB/T 7714
Zhang, Ying,Zheng, Shili,Wang, Xiaohui,et al. Reactive extraction of sodium hydroxide from alkali solutions for the separation of sodium and aluminum - Part I. Effect of extractant[J]. HYDROMETALLURGY,2015,154(APR):47-55.
APA Zhang, Ying,Zheng, Shili,Wang, Xiaohui,Du, Hao,Fang, Zhigang Zak,&Zhang, Yi.(2015).Reactive extraction of sodium hydroxide from alkali solutions for the separation of sodium and aluminum - Part I. Effect of extractant.HYDROMETALLURGY,154(APR),47-55.
MLA Zhang, Ying,et al."Reactive extraction of sodium hydroxide from alkali solutions for the separation of sodium and aluminum - Part I. Effect of extractant".HYDROMETALLURGY 154.APR(2015):47-55.
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