Knowledge Management System Of Institute of process engineering,CAS
| Mineralogical phase separation and leaching characteristics of typical toxic elements in Chinese lignite fly ash | |
| Liu, Fuli1,2; Ma, Shuhua2; Ren, Kun2,3; Wang, Xiaohui2 | |
| 2020-03-15 | |
| Source Publication | SCIENCE OF THE TOTAL ENVIRONMENT
 |
| ISSN | 0048-9697 |
| Volume | 708Pages:10 |
| Abstract | To investigate the distribution characteristics of typical toxic elements in different mineralogical phases of fly ash is of significance when fly ash is comprehensively utilized. In this study, lignite fly ash can be preliminarily separated into three mineralogical phases: unburned lignite, iron microbeads and aluminate-silicate microbeads by two methods namely screening and dry magnetic separation. Then, the aluminate-silicate microbeads were subjected to two-step leaching. The first step was to investigate whether toxic elements migrated easily in the environment by column leaching test. In the second step, the aluminate-silicate microbeads were stripped from the surface of the particles to the internal by the acid-base combined leaching method, then the structural characteristics of the product and the trend of toxic elements content were explored. The results showed that there were few toxic elements in unburned lignite and the toxic elements Cr, Ni, Mo and Cd had a relatively high proportion in the iron microbeads. Column leaching results showed that the toxic elements V, Cr, Mn, Co, Cu, Hg and Pb had higher leaching rates, which proved that these elements were significantly enriched on the surface of the particles and easily migrated in the environment. Cr, Mo, Cd and W were highly enriched in the quartz-mullite mixture. Mn, Co, Ni, Cu, Zn and As were highly enriched in the amorphous component. The toxic elements exhibited different leaching rules during the acid-base combined leaching process revealing the complex embedded relationship with constant elements. (C) 2019 Elsevier B.V. All rights reserved. |
| Keyword | Lignite fly ash Toxic element Mineralogical phase separation Leaching characteristic |
| DOI | 10.1016/j.scitotenv.2019.135095 |
| Language | 英语 |
| WOS Keyword | TRACE-ELEMENTS ; COAL ; ALUMINA ; ACTIVATION ; ADSORPTION ; CERAMICS ; BEHAVIOR ; GLASS ; SIZE |
| Funding Project | major science and technology projects in Inner Mongolia Autonomous Region[2060901] |
| WOS Research Area | Environmental Sciences & Ecology |
| WOS Subject | Environmental Sciences |
| Funding Organization | major science and technology projects in Inner Mongolia Autonomous Region |
| WOS ID | WOS:000506214900138 |
| Publisher | ELSEVIER |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.ipe.ac.cn/handle/122111/38548 |
| Collection | 中国科学院过程工程研究所 |
| Corresponding Author | Ma, Shuhua |
| Affiliation | 1.Liaoning Tech Univ, Coll Min, Liaoning 123000, Fuxin, Peoples R China 2.Chinese Acad Sci, CAS Key Lab Green Proc & Engn, Inst Proc Engn, Beijing 100190, Peoples R China 3.China Univ Min & Technol, Coll Chem & Environm Engn, Beijing 100083, Peoples R China |
| Recommended Citation GB/T 7714 | Liu, Fuli,Ma, Shuhua,Ren, Kun,et al. Mineralogical phase separation and leaching characteristics of typical toxic elements in Chinese lignite fly ash[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2020,708:10. |
| APA | Liu, Fuli,Ma, Shuhua,Ren, Kun,&Wang, Xiaohui.(2020).Mineralogical phase separation and leaching characteristics of typical toxic elements in Chinese lignite fly ash.SCIENCE OF THE TOTAL ENVIRONMENT,708,10. |
| MLA | Liu, Fuli,et al."Mineralogical phase separation and leaching characteristics of typical toxic elements in Chinese lignite fly ash".SCIENCE OF THE TOTAL ENVIRONMENT 708(2020):10. |
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