文献类型：期刊文献

英文题名：Distribution and modes of occurrence of heavy metals in opposed multi-burner coal-water-slurry gasification plants

作者：Jiang, Peng[1,2];Xie, Cheng-rui[1];Luo, Chun-lin[1];Meng, Wei[2];Yang, Gang[1,3];Yu, Guang-suo[4];Gong, Yan[4];Xu, Mengxia[1,3];Wu, Tao[1,3]

机构：[1]Univ Nottingham Ningbo China, Dept Chem & Environm Engn, Ningbo 315100, Peoples R China;[2]Shenzhen Gas Corp Ltd, Shenzhen Engn Res Ctr Gas Distribut & Efficient U, Shenzhen 518049, Peoples R China;[3]Univ Nottingham Ningbo China, Key Lab Carbonaceous Wastes Proc & Proc Intensifi, Ningbo 315100, Peoples R China;[4]East China Univ Sci & Technol, Key Lab Coal Gasificat & Energy Chem Engn, Minist Educ, Shanghai 200237, Peoples R China

年份：2021

卷号：303

外文期刊名：FUEL

收录：;EI(收录号：20212510528723);WOS:【SCI-EXPANDED(收录号:WOS:000704391900008)】；

基金：This work was supported by the National Key Research and Development Program of China (Grant No. 2017YFB0602601); the Key Research and Development Program of Ningxia Hui Autonomous Region (2019BCH01001); and the China Postdoctoral Science Foundation (2021M692220). Special thanks were regarded to Dr Junming Fan and Dr Luling Li for productive discussions. Authors 1 and 2 contributed equally to this work.

语种：英文

外文关键词：Heavy metal; Gasification slag; Mode of occurrence; Migration; Leaching behaviour

摘要：To understand the migration and modes of occurrence of heavy metals in the opposed multi-burner (OMB) coalwater-slurry (CWS) gasification process, samples of coal, coarse and fine slags were obtained from two plants with different capacities. Concentrations of nine hazardous heavy metals (HMs) in these samples, i.e., Ba, Co, Cr, Cu, Mn, Ni, Pb, V, and Zn, were determined to show their migration and enrichment behaviours. A four-step sequential extraction method was implemented to reveal the modes of occurrence of these HMs. Results demonstrated that fine slags were mainly fragmentized spheres and were covered by fine floccules, whilst coarse slags were vitreous, angular and less porous than fine slags. Majority of the heavy metals were more concentrated in fine slags. Chromium was enriched in coarse slags, while Pb and Zn were accumulated in fine slags as indicated by the relative enrichment index. The sequential extraction demonstrated that for the coals, Cr, Cu, Ni, V and Zn were primarily associated with residual fractions (48.8-82.6 wt%), while Co, Mn and Pb were dominant in oxidizable (78.1 wt%), acid soluble (60.0 wt%) and reducible fractions (99.2 wt%), respectively. In fine slags, except for Zn, the other HMs were mainly distributed in residual fraction with 42.3 to 94.8 wt% in fine and coarse slags, respectively. Mobile fraction of HMs was the highest in coals (19.4-93.6 wt%), followed by fine slags (11.6-73.1 wt%) and coarse slags (5.1-41.0 wt%). Based on the leaching ability, except Cu, the HMs content in all slags were above the standard for direct landfill disposal.