CAS OpenIR
Removal and fixation of arsenic by forming a complex precipitate containing scorodite and ferrihydrite
Otgon, Nasantogtokh1,2,3; Zhang, Guangji1,2,3; Zhang, Kailun4; Yang, Chao1,2,3
2019-06-01
Source PublicationHYDROMETALLURGY
ISSN0304-386X
Volume186Pages:58-65
AbstractFor 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.
KeywordArsenic removal Two-stage precipitation Crystallization Scorodite Arsenical ferrihydrite
DOI10.1016/j.hydromet.2019.03.012
Language英语
WOS KeywordAMORPHOUS FERRIC ARSENATE ; FERROUS SULFATE-SOLUTION ; ATMOSPHERIC SCORODITE ; PHASE-TRANSFORMATIONS ; SURFACE-CHEMISTRY ; OXIDATION ; IRON ; SOLUBILITIES ; TEMPERATURE ; ADSORPTION
Funding ProjectNational 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 Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
Funding OrganizationNational 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
WOS IDWOS:000473837400007
PublisherELSEVIER SCIENCE BV
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Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/30234
Collection中国科学院过程工程研究所
Corresponding AuthorZhang, Guangji
Affiliation1.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
Recommended Citation
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.
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