Abstract
The ilmenite-chloride process has used for the production of TiCl4 from the ilmenite (FeTiO3) ore, which produces cyclone dust containing mostly iron chloride and includes a range of metal chlorides. The utilization of iron values present in waste chlorides of cyclone dust is becoming a crucial issue to make this process competitive. The current work demonstrates a beneficial process that can selectively separate iron values from the chloride residue. Using CaCO3 as a precipitating agent, the iron component was selectively isolated from the aqueous solution of the chloride residues. The selective extraction of iron was carried out at a wide range of concentrations, and the yield of iron species was over 95%. The precipitate is in the form of Fe(OH)3, which converts to Fe2O3 when annealed in air. In the next step, the remaining metal impurities were removed as solid precipitates through the pH tuning with CaO. Finally, CaCl2 and CaCO3 were obtained by adding CO2 to the residual solution. This study provides a method of treating cyclone residues to recover CaCl2 as well as Fe(OH)3, which represents significant progress towards the utilization of iron-rich wastes.
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Acknowledgements
This work was supported by the Technology Innovation Program, funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea) under contract number 10052751. This work was also supported by the “Human Resources Program in Energy Technology” of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resources from the MOTIE (Korea) through the grant number 20174010201150.
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Yang, H.J., Yoon, S.W., Kim, Y.J. et al. Recovery of iron oxide and calcium chloride from an iron-rich chloride waste using calcium carbonate. J Mater Cycles Waste Manag 23, 222–230 (2021). https://doi.org/10.1007/s10163-020-01119-x
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DOI: https://doi.org/10.1007/s10163-020-01119-x