Mineral phase transition of desilicated high alumina fly ash with alumina extraction in mixed alkali solution

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	Mineral phase transition of desilicated high alumina fly ash with alumina extraction in mixed alkali solution
	Sun, Zhenhua; Li, Huiquan; Bao, Weijun; Wang, Chenye
刊名	INTERNATIONAL JOURNAL OF MINERAL PROCESSING
	2016-08-10
卷号	153 期号:AUG 页码:109-117
关键词	Desilicated high alumina fly ash Mixed alkali solution Mineral phase transition Alumina extraction NaCaHSiO4
ISSN号	0301-7516
英文摘要	High alumina fly ash (HAFA), a main industrial solid waste produced in increasing amounts in western China, is a type of alumina-rich resource that can replace bauxite in the preparation of alumina. A new process of alumina extraction from HAFA is proposed in this paper. This method involved the raw HAFA being treated first by a low concentration alkali solution to form desilicated HAFA and then alumina was effectively extracted from desilicated HAFA in mixed alkali solution (NaOH + Ca(OH)(2)). The effects of the reaction conditions on alumina leaching from desilicated HAFA were investigated. The extraction efficiency of alumina could reach 92.0% under the following optimal conditions: alkali to ash ratio of 6, calcium to silicate ratio of 1.0, and reaction temperature of 280 degrees C. After alumina extracted from desilicated HAFA, the solid residues were collected and characterized to better understand the mechanism of mineral phase transition of desilicated HAFA with alumina extraction in mixed alkali solution. By changing the calcium to silica ratio or alkali to ash ratio, the mineral phases could be transformed from 1.2Na(2)O center dot 0.8CaO center dot Al2O3 center dot 2SiO(2)center dot H2O to NaCaHSiO4. A relatively high alkali to ash ratio or calcium to silicate ratio was preferred for the extraction of alumina from desilicated HAFA. (C) 2016 Elsevier B.V. All rights reserved.
WOS标题词	Science & Technology ; Technology ; Physical Sciences
类目[WOS]	Engineering, Chemical ; Mineralogy ; Mining & Mineral Processing
研究领域[WOS]	Engineering ; Mineralogy ; Mining & Mineral Processing
关键词[WOS]	COAL ; CHINA
收录类别	SCI
语种	英语
WOS记录号	WOS:000379634800013
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/21228]
专题	过程工程研究所_湿法冶金清洁生产技术国家工程实验室
作者单位	Chinese Acad Sci, Key Lab Green Proc & Engn, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Sun, Zhenhua,Li, Huiquan,Bao, Weijun,et al. Mineral phase transition of desilicated high alumina fly ash with alumina extraction in mixed alkali solution[J]. INTERNATIONAL JOURNAL OF MINERAL PROCESSING,2016,153(AUG):109-117.
APA	Sun, Zhenhua,Li, Huiquan,Bao, Weijun,&Wang, Chenye.(2016).Mineral phase transition of desilicated high alumina fly ash with alumina extraction in mixed alkali solution.INTERNATIONAL JOURNAL OF MINERAL PROCESSING,153(AUG),109-117.
MLA	Sun, Zhenhua,et al."Mineral phase transition of desilicated high alumina fly ash with alumina extraction in mixed alkali solution".INTERNATIONAL JOURNAL OF MINERAL PROCESSING 153.AUG(2016):109-117.