Extraction of alumina from coal fly ash by mixed-alkaline hydrothermal method
文献类型：期刊论文
| 作者 | Li, Huiquan1; Hui, Junbo1,2; Wang, Chenye1; Bao, Weijun1; Sun, Zhenhua1 |
| 刊名 | HYDROMETALLURGY
 |
| 出版日期 | 2014-08-01 |
| 卷号 | 147期号:8m页码:183-187 |
| 关键词 | Alumina Coal fly ash Alkaline hydrothermal Extraction |
| ISSN号 | 0304-386X |
| 其他题名 | Hydrometallurgy |
| 中文摘要 | Alumina was leached from coal fly ash using a mixed alkali (NaOH + Ca(OH)(2)) through the hydrothermal method. The effects of leaching conditions on the alumina were studied, and the results showed that the alumina extraction ratio increased with increased reaction temperature, calcium-silicon ratio, and liquid-solid ratio. By optimising the leaching conditions, the alumina extraction ratio could reach 91.3%. The obtained leaching residues were analysed by X-ray diffraction (XRD) and scanning electron microscope (SEM) + energy dispersive spectrometer (EDS), and the reaction mechanism was also discussed. Results showed that amorphous silica and mullite were first dissolved and transformed into hydro-sodalite at relatively low temperatures. Hydro-sodalite reacted with calcium hydroxide to form sodium calcium silicate (NaCaHSiO4), which was the major component of the leaching residue. Zeolite was the equilibrium product, which accounted for most of the alumina leaching loss. The addition of Ca(OH)(2) effectively inhibited the silicon leaching into the solution. (C) 2014 Elsevier B.V. All rights reserved. |
| 英文摘要 | Alumina was leached from coal fly ash using a mixed alkali (NaOH + Ca(OH)(2)) through the hydrothermal method. The effects of leaching conditions on the alumina were studied, and the results showed that the alumina extraction ratio increased with increased reaction temperature, calcium-silicon ratio, and liquid-solid ratio. By optimising the leaching conditions, the alumina extraction ratio could reach 91.3%. The obtained leaching residues were analysed by X-ray diffraction (XRD) and scanning electron microscope (SEM) + energy dispersive spectrometer (EDS), and the reaction mechanism was also discussed. Results showed that amorphous silica and mullite were first dissolved and transformed into hydro-sodalite at relatively low temperatures. Hydro-sodalite reacted with calcium hydroxide to form sodium calcium silicate (NaCaHSiO4), which was the major component of the leaching residue. Zeolite was the equilibrium product, which accounted for most of the alumina leaching loss. The addition of Ca(OH)(2) effectively inhibited the silicon leaching into the solution. (C) 2014 Elsevier B.V. All rights reserved. |
| WOS标题词 | Science & Technology ; Technology |
| 类目[WOS] | Metallurgy & Metallurgical Engineering |
| 研究领域[WOS] | Metallurgy & Metallurgical Engineering |
| 收录类别 | SCI |
| 原文出处 | |
| 语种 | 英语 |
| WOS记录号 | WOS:000340333100026 |
| 公开日期 | 2014-09-30 |
| 版本 | 出版稿 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/11436]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 作者单位 | 1.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 |
| 推荐引用方式 GB/T 7714 | Li, Huiquan,Hui, Junbo,Wang, Chenye,et al. Extraction of alumina from coal fly ash by mixed-alkaline hydrothermal method[J]. HYDROMETALLURGY,2014,147(8m):183-187. |
| APA | Li, Huiquan,Hui, Junbo,Wang, Chenye,Bao, Weijun,&Sun, Zhenhua.(2014).Extraction of alumina from coal fly ash by mixed-alkaline hydrothermal method.HYDROMETALLURGY,147(8m),183-187. |
| MLA | Li, Huiquan,et al."Extraction of alumina from coal fly ash by mixed-alkaline hydrothermal method".HYDROMETALLURGY 147.8m(2014):183-187. |
入库方式： OAI收割
来源：过程工程研究所
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