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Synthesis of superfine calcium carbonate during causticization in highly alkaline system for utilization of high-alumina fly ash
Zhu, Ganyu1,2; Li, Huiquan1; Lin, Rongyi1; Li, Shaopeng1; Hou, Xinjuan1; Tang, Qing1
2016-10-01
Source PublicationHYDROMETALLURGY
ISSN0304-386X
Volume165Issue:OCTPages:282-289
Abstract

In the alumina extraction process of high-alumina fly ash, alkali was used to remove amorphous silica and then recovered through causticization. Focusing on the causticization process, the coupling control of CO32- conversion and CaCO3 crystallization is important to secondary-pollution reduction and high-value utilization. Influences of temperature, stirring rate, feeding time, Ca(OH)(2) concentration, and calcium/carbonate (Ca2+/CO32-) ratio on the conversion and CaCO3 morphology were investigated. Feeding time and Ca2+/CO32- ratio showed crucial effects on the conversion and crystallization of CaCO3 particles. Under optimized conditions, the conversion of CO32- can reach 95.67%, and the alkali can be well recycled with the generation of superfine calcium carbonate. Furthermore, the morphology evolution of CaCO3 was investigated in the reaction process. At the beginning of causticization, a combination of amorphous and crystalline structures can be observed. Subsequently, cubic and homogeneous morphologies were formed. At the end of the reaction, the edges of the cubic particles were dissolved, and the large particles with irregular shapes were formed by the joint of small ones in the alkaline system. (C) 2016 Elsevier B.V. All rights reserved.

KeywordHigh-alumina Fly Ash Calcium Carbonate Causticization Crystallization
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/j.hydromet.2016.01.022
Indexed BySCI ; ISTP
Language英语
WOS KeywordARAGONITE ; CRYSTALLIZATION ; GROWTH
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000383522100010
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/21335
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, Natl Engn Lab Hydromet Cleaner Prod Technol, 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
Zhu, Ganyu,Li, Huiquan,Lin, Rongyi,et al. Synthesis of superfine calcium carbonate during causticization in highly alkaline system for utilization of high-alumina fly ash[J]. HYDROMETALLURGY,2016,165(OCT):282-289.
APA Zhu, Ganyu,Li, Huiquan,Lin, Rongyi,Li, Shaopeng,Hou, Xinjuan,&Tang, Qing.(2016).Synthesis of superfine calcium carbonate during causticization in highly alkaline system for utilization of high-alumina fly ash.HYDROMETALLURGY,165(OCT),282-289.
MLA Zhu, Ganyu,et al."Synthesis of superfine calcium carbonate during causticization in highly alkaline system for utilization of high-alumina fly ash".HYDROMETALLURGY 165.OCT(2016):282-289.
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