Mineral phase transition of desilicated high alumina fly ash with alumina extraction in mixed alkali solution
Sun, Zhenhua; Li, Huiquan; Bao, Weijun; Wang, Chenye
2016-08-10
发表期刊INTERNATIONAL JOURNAL OF MINERAL PROCESSING
ISSN0301-7516
卷号153期号:AUG页码:109-117
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.
关键词Desilicated High Alumina Fly Ash Mixed Alkali Solution Mineral Phase Transition Alumina Extraction Nacahsio4
文章类型Article
WOS标题词Science & Technology ; Technology ; Physical Sciences
DOI10.1016/j.minpro.2016.05.004
收录类别SCI
语种英语
关键词[WOS]COAL ; CHINA
WOS研究方向Engineering ; Mineralogy ; Mining & Mineral Processing
WOS类目Engineering, Chemical ; Mineralogy ; Mining & Mineral Processing
项目资助者National Basic Research Program of China(2013CB632605) ; National High Technology Research and Development Program of China (863 program)(2012 AA061717)
WOS记录号WOS:000379634800013
引用统计
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/21228
专题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
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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.
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