Hello,
I am looking for an industrial process that would remove iron ions (20ppm -> 2ppm) from a concentrated sulfuric acid (78% by weight).
I have already explored some solutions:
- Electrodialysis: This process seems to work for high iron concentrations but is not suitable for such low concentrations.
- Ion exchange resin: A resin could be a good solution but I can't find a resin that effectively captures iron ions in a very acidic environment.
Nanofiltration: This technique effectively removes iron ions from sulfuric acid but the filter does not support pH values below 0, so the acid should be diluted and then concentrated.
Are there any other solutions where the ones listed above are the only ones available?
Thank you in advance for your answers
Activated carbon from mineral source could be a solution, however due to highly acidic condition you may have powder after the adsorption process. Also the acidic media could detach the adsorbed iron, further experiments are needed to observe the adsorption-desorption process
Hope you find the right answer for your problem
Regards
https://pdfs.semanticscholar.org/eaaa/2871bd3f8d423c4cc4820457d379eda3716a.pdf
Article Purification of H2SO4 of Pickling Bath Contaminated by Fe(II...
Hello Arnaud, Can you share what solution was appropriate for your problem. I am facing a similar problem.
It is worth to check also:
Article Iron(III) removal from base-metal electrolyte solutions by s...
R.A. Spitz, "Process for the reclamation of battery acid and fluid from expended lead-acid batteries", US Patent 4,971,780, Nov. 20, 1990.
R.A. Spitz, M. Bricker, "Process for the extended use of strip acid employed in the reclamation of battery acid fluid from expanded lead-acid batteries", US Patent 5,009,868, Apr. 23, 1991.
R.A. Stitz, M. Bricker, "Process of reclaiming battery acid from lead acid batteries", Int. Patent, WO 1991 009810 A1, 11 July 1991.
M.J. Gula, D.B. Dreisinger, E.P. Horwitz, "Ion exchange and regeneration process for separation and removal of iron (iii) ions from aqueous sulfuric acid metal ion-containing solutions", US Patent 5,582,737, Dec. 10, 1996.
