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A novel process to enrich alumina and prepare silica nanoparticles from high-alumina fly ash
Liu, Chun-li1,2; Zheng, Shi-li1; Ma, Shu-hua1; Luo, Yang1; Ding, Jian1; Wang, Xiao-hui1; Zhang, Yi1
2018-05-01
Source PublicationFUEL PROCESSING TECHNOLOGY
ISSN0378-3820
Volume173Pages:40-47
Abstract

Extraction of alumina from high-alumina fly ash (HAFA) enhances the value-added utilization of HAFA. However, this industrial application has been restricted by the high silica content of HAFA. Thus, alumina enrichment via the separation of silica is a key technique for HAFA utilization. In this study, a novel method of alumina enrichment by ammonium fluoride activation was proposed. The influence of the ammonium fluoride to silica in HAFA molar ratio (F/Si), the calcination temperature, and calcination time on the alumina to silica mass ratio (Al/Si) of the calcined product were investigated. The results showed that the Al/Si ratio reached 8.83 when HAFA with a F/Si ratio of 5.0 was calcined at 850 degrees C for 60 min. Silica in HAFA was transformed into gaseous ammonium fluosilicate, which was separated from the calcined product by condensation, thereby increasing the Al/Si ratio. However, impurities in HAFA inhibited further improvement of the Al/Si ratio. Subsequently, dissolution of ammonium fluosilicate with a surfactant produced silica nanoparticles with a surface area of 454.2 m(2)/g and a recyclable ammonium fluoride solution through an ammonification process. Thus, this work provides a novel strategy for the high-value utilization of HAFA.

KeywordHigh-alumina Fly Ash Alumina Enrichment Ammonium Fluoride Activation Silica Nanoparticle
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
DOI10.1016/j.fuproc.2018.01.007
Indexed BySCI
Language英语
WOS KeywordJungar Power-plant ; Extracting Alumina ; High-temperature ; Inner-mongolia ; China ; Fluoride ; Pretreatment ; Mineralogy ; Behavior ; Ores
WOS Research AreaChemistry ; Energy & Fuels ; Engineering
WOS SubjectChemistry, Applied ; Energy & Fuels ; Engineering, Chemical
Funding OrganizationMajor State Basic Research Development Program of China(2013CB632601)
WOS IDWOS:000429398400005
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/24161
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, CAS Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Liu, Chun-li,Zheng, Shi-li,Ma, Shu-hua,et al. A novel process to enrich alumina and prepare silica nanoparticles from high-alumina fly ash[J]. FUEL PROCESSING TECHNOLOGY,2018,173:40-47.
APA Liu, Chun-li.,Zheng, Shi-li.,Ma, Shu-hua.,Luo, Yang.,Ding, Jian.,...&Zhang, Yi.(2018).A novel process to enrich alumina and prepare silica nanoparticles from high-alumina fly ash.FUEL PROCESSING TECHNOLOGY,173,40-47.
MLA Liu, Chun-li,et al."A novel process to enrich alumina and prepare silica nanoparticles from high-alumina fly ash".FUEL PROCESSING TECHNOLOGY 173(2018):40-47.
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