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Removal and recovery of arsenic from concentrated sulfuric acid by solvent extraction

Jantunen, Niklas; Virolainen, Sami; Latostenmaa, Petri; Salminen, Justin; Haapalainen, Mika; Sainio, Tuomo (2019-05-13)

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jantunen_et_al_removal_and_recovery_of_arsenic_aam.pdf (3.766Mb)
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Post-print / Final draft

Jantunen, Niklas
Virolainen, Sami
Latostenmaa, Petri
Salminen, Justin
Haapalainen, Mika
Sainio, Tuomo
13.05.2019

Hydrometallurgy

187

101-112

Elsevier

School of Engineering Science

https://doi.org/10.1016/j.hydromet.2019.05.008
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2019060318196

Tiivistelmä

Arsenic-contaminated sulfuric acid solutions are produced in large quantities as by-product during pyrometallurgical processing of sulfide minerals. Options for re-using such acid solutions are increased if the arsenic is removed and recovered as a product. The performances of tributyl phosphate and a mixture of 6 wt-% 1,2-octanediol in 2-ethylhexanol were studied in liquid-liquid extraction of arsenic from an industrial solution containing 10.4 M H2SO4. It was found that, due to the complex phase equilibria, a process design based on conventional batch equilibrium data did not describe the countercurrent processes accurately. A countercurrent flowsheet utilizing undiluted tributyl phosphate was investigated by pseudo-countercurrent extractions. 83.7% extraction of arsenic and 31.4% coextraction of H2SO4 was obtained in three-stage countercurrent extraction operated at a solvent-to-feed ratio of 0.79. Two-stage countercurrent scrubbing with pure water at O/A = 4.03 back-extracted 83.6% of H2SO4 and 24.9% of arsenic. 100% and 89.7% back-extraction was achieved in four-stage stripping at O/A = 2.01 for H2SO4 and arsenic, respectively. The effects of varying the flowsheet and operating parameters on separation efficiency are discussed.

Lähdeviite

Jantunen, N., Virolainen, S., Latostenmaa, P., Salminen, J., Haapalainen, M., Sainio, T. (2019). Removal and recovery of arsenic from concentrated sulfuric acid by solvent extraction. Hydrometallurgy, 187, 101–112. https://doi.org/10.1016/j.hydromet.2019.05.008

Alkuperäinen verkko-osoite

https://www.sciencedirect.com/science/article/pii/S0304386X18309150?via%3Dihub
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