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1 Polish Journal of Chemical Technology

1 2004

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Extractive removal of arsenic from sulphuric acid solutions

Wiśniewski M., Iberhan L.

Polish Journal of Chemical Technology

2004

Vol. 6, nr 3

41-44

In the study, the extraction of arsenic(III) and arsenic(V) was investigated from the concentrated aqueous solutions of the sulphuric acid using the hydrophobic reagents of various structure and composition. The studies included stripping with water, too. The studies took advantage of the organophosphorus extracting agents CyanexŽ 923, CyanexŽ 925, CyanexŽ 301 and their mixtures, as well as of the 2-ethylhexane-l,3-diol and the hydroxamic acids dissolved in toluene. The study aimed at the removal of the maximum amounts of arsenic(III) and arsenic(V) from the sulphuric acid solution at the concentration of 150 g/dm3, using the multistage co-current or the counter-current extraction and, then, the removal of the arsenic from the organic phases by stripping with the water, with the regeneration of the extracting agent. The linear extraction and the stripping isotherms obtained in a given range of the concentrations, were used for a discussion on the multistage extraction, and the stripping of arsenic. The experimental results proved to be consistent with the obtained isotherms of the two processes and their equations.