Effects of the Cooling Rate on the Solidified Structure and Toxic Leaching of an Arsenic Matte

The conversion of arsenic-containing waste residues into arsenic matte can be an important direction for arsenic treatment. In this paper, different parts of factory samples were first taken for study, and it was found that the leaching amount of arsenic at the chilling layer is noticeably low. Then...

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Bibliographic Details
Published in:Waste and biomass valorization 2021, Vol.12 (9), p.5249-5257
Main Authors: Shi, RenZhang, Shi, Hongjiao, Liang, Jinfeng, Tong, ZhiBo, Zhou, Yue, Wang, Qin
Format: Article
Language:English
Subjects:
Arsenic
Chemical composition
Cooling
Cooling rate
Dissolution
Engineering
Environment
Environmental Engineering/Biotechnology
Industrial Pollution Prevention
Iron
Iron sulfides
Leaching
Liquid cooling
Microstructure
Original Paper
Phase separation
Renewable and Green Energy
S phase
Solid solutions
Toxicity
Waste Management/Waste Technology
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Summary:The conversion of arsenic-containing waste residues into arsenic matte can be an important direction for arsenic treatment. In this paper, different parts of factory samples were first taken for study, and it was found that the leaching amount of arsenic at the chilling layer is noticeably low. Then, the effects of the cooling rate on the phase, microstructure, and chemical compositions and the subsequent toxicity leaching of the arsenic matte were studied. The results show that the alloy structure was obviously refined and the cavity size was also significantly reduced with an increase in cooling rate. Many large-strip FeS and arsenic-containing iron solid solutions were embedded in the matrix (Fe 2 As) of the furnace-cooled and air-cooled samples; additionally, the Fe–As–S phase was probably caused by an insufficient phase separation of FeS from Fe 2 As in the rapid cooling process of die cooling and water cooling. FeS in the factory samples was dissolved in the leaching solution, while Fe 2 As could resist the corrosion of the leaching solution; therefore, it was speculated that the dissolution of arsenic was caused by the dissolution of FeS. The leaching mechanism was also discussed in this paper. Graphic Abstract The cooling rate affects phase, microstructure, and chemical compositions and toxicity leaching of the arsenic matte, which speculated that the dissolution of arsenic was caused by the dissolution of FeS
ISSN:1877-2641
1877-265X
DOI:10.1007/s12649-021-01388-z