Stabilization of ferric arsenate sludge with mechanochemically prepared FeS2/Fe composites

FeS2/Fe composites were mechanochemically prepared with iron powder and pyrite for the stabilization of ferrite arsenate sludge (FAS). The effects of preparation parameters on stabilization performance were investigated. The results show that the optimum conditions are FeS2/Fe molar ratio of 5:5, mi...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2019-09, Vol.29 (9), p.1983-1992
Main Authors: MIN, Xiao-bo, PENG, Tian-yu, LI, Yang-wen-jun, KE, Yong, LIANG, Yan-jie, HE, Xing-yu
Format: Article
Language:English
Subjects:
arsenic
ferric arsenate sludge
FeS2/Fe composites
mechanical milling
stabilization
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Summary:FeS2/Fe composites were mechanochemically prepared with iron powder and pyrite for the stabilization of ferrite arsenate sludge (FAS). The effects of preparation parameters on stabilization performance were investigated. The results show that the optimum conditions are FeS2/Fe molar ratio of 5:5, milling time of 2 h, ball-to-material mass ratio of 15:1 and milling with stainless steel ball. Then, the composites were characterized by XRD, SEM, FTIR, etc. The physicochemical properties of FeS2/Fe mixture change dramatically, which is responsible for its excellent performance. Finally, the stabilization process of FAS was optimized. When the FAS is mixed with composites at mass ratio of 4:1 and milled for 30 min, the As leaching concentration of FAS can be reduced from 639.15 to 4.74 mg/L with the stabilization ratio of 99.2%.
ISSN:1003-6326
DOI:10.1016/S1003-6326(19)65106-X