Removal and fixation of arsenic by forming a complex precipitate containing scorodite and ferrihydrite
文献类型：期刊论文
| 作者 | Otgon, Nasantogtokh1,2,3; Zhang, Guangji1,2,3; Zhang, Kailun4; Yang, Chao1,2,3 |
| 刊名 | HYDROMETALLURGY
 |
| 出版日期 | 2019-06-01 |
| 卷号 | 186页码:58-65 |
| ISSN号 | 0304-386X |
| 关键词 | Arsenic removal Two-stage precipitation Crystallization Scorodite Arsenical ferrihydrite |
| DOI | 10.1016/j.hydromet.2019.03.012 |
| 英文摘要 | For the metallurgical industries, the safe disposal of arsenic-bearing waste is animportant issue. In this study, a two-stage arsenic precipitation process was proposed, which consists of formation of scorodite at lower pH followed by precipitation of arsenical ferrihydrite at higher pH. The experimental results show that arsenic can be removed effectively from a solution with arsenic concentration of 5 g/L as precipitate of crystalline scorodite through oxidizing ferrous ions with air stream at pH of 2at first. Then, the pH value was raised to 3 and 4, and almost all the residual arsenic was removed from the solution due to adsorption onto amorphous ferrihydrite at the molar ratio of Fe/As between 2 and 4. The United States Environmental Protection Agency's Toxicity Characteristic Leaching Procedure tests demonstrate that the complex precipitates generated under these conditions (Fe/As ratio of 4, final pH between 3 and 4) were very stable and no leached arsenic can be detected using acetic acid buffer solution (pH 4.93 +/- 0.05) in tests of 72 h. Experimental results suggest that a high Fe/As ratio was necessary, so that the excess iron promotes the formation a product of good stability, arsenical ferrihydrite (AsFH: AsO43-center dot Fe(OH)(H2O)(1+x)) under a relatively high pH in acidic solution. |
| WOS关键词 | AMORPHOUS FERRIC ARSENATE ; FERROUS SULFATE-SOLUTION ; ATMOSPHERIC SCORODITE ; PHASE-TRANSFORMATIONS ; SURFACE-CHEMISTRY ; OXIDATION ; IRON ; SOLUBILITIES ; TEMPERATURE ; ADSORPTION |
| 资助项目 | National Key R&D Program of China[2016YFB0301702] ; Major National Scientific Instrument Development Project[21427814] ; National Natural Sciences Foundation of China[215762715] ; Key Research Program of Frontier Sciences of CAS[QYZDJ-SSW-JSC030] |
| WOS研究方向 | Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| 出版者 | ELSEVIER SCIENCE BV |
| WOS记录号 | WOS:000473837400007 |
| 资助机构 | National Key R&D Program of China ; Major National Scientific Instrument Development Project ; National Natural Sciences Foundation of China ; Key Research Program of Frontier Sciences of CAS |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/30233]  |
| 专题 | 中国科学院过程工程研究所 |
| 通讯作者 | Zhang, Guangji |
| 作者单位 | 1.Chinese Acad Sci, Natl Key Lab Biochem Engn, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Key Lab Green Proc & Engn, Inst Proc Engn, Beijing 100190, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.China Univ Min & Technol Beijing, Beijing 100083, Peoples R China |
| 推荐引用方式 GB/T 7714 | Otgon, Nasantogtokh,Zhang, Guangji,Zhang, Kailun,et al. Removal and fixation of arsenic by forming a complex precipitate containing scorodite and ferrihydrite[J]. HYDROMETALLURGY,2019,186:58-65. |
| APA | Otgon, Nasantogtokh,Zhang, Guangji,Zhang, Kailun,&Yang, Chao.(2019).Removal and fixation of arsenic by forming a complex precipitate containing scorodite and ferrihydrite.HYDROMETALLURGY,186,58-65. |
| MLA | Otgon, Nasantogtokh,et al."Removal and fixation of arsenic by forming a complex precipitate containing scorodite and ferrihydrite".HYDROMETALLURGY 186(2019):58-65. |
入库方式： OAI收割
来源：过程工程研究所
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