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Improving ferric ions extraction from Egyptian ilmenite ore by liquid membrane assisted leaching |
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Through activation of Bilateral Cooperation Agreement between Egypt and Italy, CNR and CMRDI have joint project entitled: Liquid Membrane Assisted Leaching of Some Natural Ores for Improving Metals Extraction with Prof. El-Sayed A. Abdel-Aal, head of Advanced Materials Department (CMRDI) and Prof. Enrico Driol, the Director of Institute on Membrane Technology at University of Calabria. The present joint project deals with the improvement of titanium dissolution from an Egyptian natural ilmenite ore. Continuous reduction or removal of the leached ferric ions into ferrous ions greatly improved the leaching behavior of ilmenite ore in hydrochloric acid. The idea behind this project is the enhancement of the ore digestion in hydrochloric acid by the continuous removal of ferric ion from the solution instead of adding a reducing agent (as iron powder) to the leaching medium. An organic solvent was suggested to play this role. Ferric ions are suggested to be extracted from the leaching pulp solution into the organic solvent during the leaching process. Ferric ions will be transported from the leach liquor into another immiscible organic phase using supported liquid membrane. The obtained results with two-stage leaching followed by 4 consecutive membrane separation stages revealed that Fe removal efficiency of about 85% was achieved. Fe content in the feed solution before and after 4 stages membrane separation are 0.42% and 0.064%, respectively. The precipitated particles of iron oxy chloride have a size of about 1 micron.
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