Evaluation of the Wettability and Other Physical Properties of Iron Ore Particles that Consumed in the Pelletizing Plant of Mobarakeh Steel Co.

مهندسی متالورژی و مواد

Article 5, Volume 31, Issue 1 - Serial Number 21, March 2020, Pages 49-62   

Document Type: Original Articles

DOI: 10.22067/ma.v31i1.63993

Authors

Mehdi Aliazdeh^{* 1}; Mohsen Alizadeh²

¹Isfahan University of Technology

²Malek-ashtar University of Technology

Abstract

Mostly, the physical properties of iron ore particles such as wettability, size, size distribution and morphology have important effects on the pellet ability of powder mixtures and quality of green pellet. In this work, these physical properties of particles used in the pelletizing plant of Mobarakeh Steel Co. were studied. The wettability of iron ore particles was evaluated using different wetting media and the samples which were prepared from lumps of low and high purity iron ores (received from Chadormalu and Sangan). The scanning electron microscope, laser diffraction particle sizing measurement (SLS method) and sieve screening experiments were used to evaluate the shape, size and size distribution of particles. The BET and Fisher tests were employed to determine the pore distribution and specific surface area, respectively. The high wettability was measured for high-grade Chadormalu iron ore when Carboxymethyl cellulose organic binder solution was used. The results also showed that the NaOH addition reduces the wettability of iron ore. The average particle size of milled concentrate in the mixed materials was measured around 10 . The small particle sizes facilitate the formation of micro-agglomerates in powder and the consequent reduction of capillary pressure during the pellet forming. The results of BET experiment also revealed the reduction in porosity and roughness of particles surfaces.

Keywords

Iron ore concentrate; Ballability; Organic binder; Wettability; Particle size distribution; Micro-agglomerates

Supplementary Files

5-Alizadeh.pdf

References

1. Seija Forsmo/B. Bjorkman, "Influence of green pellet properties on pelletizing of magnetite iron ore", Doctoral Thesis, Lulea University of Technology Department of Chemical Engineering and Geosciences ( 2007).

2. S. Forsmo, A. Apelqvist, B. Bjorkman and P.O. Samskog, "Binding mechanisms in wet iron ore green pellets with a bentonite binder", Powder Technology, Vol. 169, pp. 147-158, (2006).

3. S.M. Iveson, S. Holt and S. Biggs, "Contact angle measurements of iron ore powders", Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 166, pp. 203-214, (2000).

4. Wolfgang Pietsch, "Agglomeration processes phenomena, technologies, equipment", Koppern & Hattingen, Germany, (2002).

5. E. Potapova, "Studies on the adsorption of flotation collectors on iron oxides", Lule Tekniska Universitet, (2009).

6. O. Sivrikaya and A.h. Arol, "The bonding/strengthening mechanism of colemanite added organic binders in iron ore pelletization", International Journal of Mineral Processing, Vol. 110, pp. 90-100, (2012).

7. G. Qiu, T. Jiang, H. Li and D. Wang, "Functions and molecular structure of organic binders for iron ore pelletization", Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 224 11-22, (2003).

8. رابرت پلک، "تک فرایندهای متالورژی استخراجی"، مترجمین علی سعیدی و ابوالفضل امیرکاوئی، انتشارات جهاد دانشگاهی صنعتی اصفهان، (1389).

9. J. Pal, S. Ghorai, S. Agarwal, B. Nandi, T. Chakraborty, G. Das and S. Prakash,"Effect of blaine fineness on the quality of hematite iron ore pellets for blast furnace", Mineral Processing and Extractive Metallurgy Review, Vol. 36, pp. 83-91, (2015).

10. E.C. Donaldson and W. Alam," Wettability", Gulf Publishing Company, Houston,( 2008).

11. S. Forsmo, P.O. Samskog, and B. Bjrkman, "A study on plasticity and compression strength in wet iron ore green pellets related to real process variations in raw material fineness", Powder Technology, Vol. 181, pp. 321-330 (2008).

12. A. Saidi, M. Shamanian, M. Barati and K. Azari,"Hyperactivation of bentonite in pelletizing process", International Journal of ISSI, Vol. 1, pp. 38-4, (2004).

13. N.A. Spaldin, "Magnetic materialas-fundamentals and applications", Cambridge University Press, New York, (2011).

14. S. Lowell, J.E. Shields, M.A. Thomas and M. Thommes, "Characterization of porous solids and powders: surface area pore size and density", Kluwer Academic Publishers, Amsterdam, (2004).

15. G. Qiu, T. Jiang, X. Fan, D. Zhu and Z. Huang, "Effects of binders on balling behaviors of iron ore concentrates", Scandinavian journal of metallurgy, Vol. 33, pp. 36-46 (2004).