Browse > Article
http://dx.doi.org/10.7464/ksct.2019.25.4.309

A Study on Cation Extraction and Impurity Separation in Slag  

Lee, Ye Hwan (Department of Environmental Energy Engineering Graduate School of Kyonggi University)
Kang, Hyerin (Department of Environmental Energy Engineering Graduate School of Kyonggi University)
Jang, Younghee (Department of Environmental Energy Engineering Graduate School of Kyonggi University)
Lee, Si-Jin (Department of Environmental Energy Engineering, Kyonggi University)
Kim, Sung Su (Department of Environmental Energy Engineering, Kyonggi University)
Publication Information
Clean Technology / v.25, no.4, 2019 , pp. 311-315 More about this Journal
Abstract
The cation extraction and impurity separation were studied in order to investigate the recyclability of a slag produced from the steel refinery industry. Two types of slag (Slag-A, B) were collected and characterized in this study. The initial characterization by X-ray diffraction (XRD) and X-ray fluorescence (XRF) confirmed the existence of various kinds of ions in the slag such as Ca2+ (30 ~ 40%), Fe3+ (20 ~ 30%), Si4+ (15%), Al3+ (10%), Mn2+ (7%), and Mg2+ (3 ~ 5%). Inductively coupled plasma atomic emission spectroscopy (ICP-AES) analysis on the extracted slag using 2 M HCl as a solvent indicated that a higher concentration of Ca2+ was extracted as the S/L ratio was increased. The Ca2+ extraction concentration were found to be 8,940 mg L-1 (Slag-A) and 10,690 (Slag-B) mg L-1 when the S/L ratio for Ca2+ extraction was 0.1. However, the extract was strongly acidic ( < pH 1) at 0.1 S/L. Also the other ions (impurities) were extracted simultaneously in addition to Ca2+. To increase the purity of Ca2+ in order to transform the slag to a high value resource, a pH-swing was conducted. The impurities tended to precipitate at higher rate as the pH was increased. Notably, the Ca2+ rapidly precipitated above a certain pH and at a pH of 10.5, while the selectivity of Ca2+ was over 99%. It is expected that the aqueous solution in which high contents of Ca2+ was selectively dissolved in this study would be suitable for the carbonation process for reducing CO2 and for the production of calcium carbonate.
Keywords
Slag; S/L ratio; pH-swing; selectivity;
Citations & Related Records
Times Cited By KSCI : 7  (Citation Analysis)
연도 인용수 순위
1 Ryu, K. W., and Choi, S. H., "The Mineral Carbonation Using Steelmaking Reduction Slag," Econ. Environ. Geol., 50(1), 27-34 (2017).   DOI
2 Lee, S. M., Kim, Y. J., Choi, C. Y., and Lee, J. Y., "Characteristics of $CO_2$ Sequestration in Indirect Mineral Carbonation (IMC) Using Cement Kiln Dust (CKD)," J. Korean Soc. Urban Environ., 18(3), 303-310 (2018).
3 Korea Meteorological Administration, Climate Change Information Center, Report of Global Atmosphere Watch 2013, Report No. 278 (2014).
4 Intergovernmental Panel on Climate Change, Carbon Dioxide Capture and Storage, IPCC Special Report, Cambridge University Press (2005).
5 Cho, B. S., Lee, H. H., and Kim, G. Y., "Status and Prospects of Recycling Blast Furnace Slag," Magazine of RCR, 7(3), 9-12 (2012).   DOI
6 Yoo, K. S., "Carbonation Technology for Waste Treatment," Appl. Chem. Eng., 18(3), 20-27 (2015).
7 Choi, J. S., "The Status and Utilization Prospect of Steel Making Slag," Architecture, 56(8), 18-22 (2012).
8 Lee, S. M., Kim, Y. J., Kim, J. M., Lee, C. H., and Jeon, J. K., "Effect of pH Adjusting Contactor on Indirect Carbonation Efficiency Using Waste Concrete," J. Korean Soc. Urban Environ., 17(1), 65-75 (2017).
9 Lee, Y. H., Lee, S. H., Hwang, I. H., Choi, S. Y., Lee, S. M., and Kim, S. S., "A Study on the Calcium Ion Extraction for PCC Production," Appl. Chem. Eng., 29(1), 43-48 (2018).   DOI
10 Son, M. A., Kim, G. H., Han, K. W., Lee, M. W., and Lim, J. T., "Development Status and Research Direction in the Mineral Carbonation Technology Using Steel Slag," Korean Chem. Eng. Res., 55(2), 141-155 (2017).   DOI
11 Mattila, H. P., "Utilization of Steelmaking Waste Materials for Production of Calcium Carbonate ($CaCO_3$)", D. Dissertation, University of Abo Akademi, Turku (2014).
12 Han, K. W., Kim, G. H., Son, M. A., and Lee, M. W., "Technical Aspects for Mineral Carbonation Using Steel Slag," Korean Soc. Energy, 10, 28 (2016).
13 Lee, S. W., Won, H. I., Choi, B. Y., Chae, S. C., Bang, J. H., and Park, K. G., "Mineral Carbonation of Serpentinite: Extraction, pH swing, and Carbonation," J. Miner. Soc. Korea, 30(4), 205-217 (2017).   DOI
14 Baek, J. Y., Jo, Y. U., Lee, J. H., Jeong, H. I., Choi, S., and Roh, Y., "Nanomaterial Recovery and Mineral Carbonation from Serpentine Minerals Using Acid Dissolution and pH swing Processes," J. Geol. Soc. Korea, 10, 271 (2015).
15 Lee, H. H., Kim, K. W., and Hong, S. C., "Characterization Studies for the Selective Catalytic Oxidation of Ammonia Utilizing Ce/$TiO_2$ Catalyst," Appl. Chem. Eng., 24(5), 494-498 (2013).   DOI
16 Youn, M. H., Park, K. T., Lee, Y. H., Kang, S. P., Lee, S. M., Kim, S. S., Kim, Y. E., Ko, Y. N., Jeong, S. K., and Lee, W. H., "Carbon Dioxide Sequestration Process for the Cement Industry," J. $CO_2$ Util., 34, 325-334 (2019).
17 Lee, Y. H., Han, D. H., Lee, S. M., Eom, H. K., and Kim, S. S., "A Study on the Cation Extraction and Separation in Cement Industrial By-products for Applications to the Carbonation Process," Appl. Chem. Eng., 30(1), 34-38 (2019).   DOI