Effect of Cooling Approaches on Chemical Compositions, Phases, and Acidolysis of Panzhihua Titania Slag

Authors: Bing Song, Kexi Han, Xuewei Lv

Abstract:

Titania slag is a high quality raw material containing titanium in the subsequent process of titanium pigment. The effects of cooling approaches of granulating, water cooling, and air cooling on chemical, phases, and acidolysis of Panzhihua titania slag were investigated. Compared to the original slag which was prepared by the conventional processing route, the results show that the titania slag undergoes oxidation of Ti³⁺during different cooling ways. The Ti₂O₃ content is 17.50% in the original slag, but it is 16.55% and 16.84% in water cooled and air-cooled slag, respectively. Especially, the Ti₂O₃ content in granulated slag is decreased about 27.6%. The content of Fe₂O₃ in granulated slag is approximately 2.86% also obviously higher than water (<0.5%) or air-cooled slag (<0.5%). Rutile in cooled titania slag was formed because of the oxidation of Ti³⁺. The rutile phase without a noticeable change in water cooled and air-cooled slag after the titania slag was cooled, but increased significantly in the granulated slag. The rate of sulfuric acid acidolysis of cooled slag is less than the original slag. The rate of acidolysis is 90.61% and 92.46% to the water-cooled slag and air-cooled slag, respectively. However, the rate of acidolysis of the granulated slag is less than that of industry slag about 20%, only 74.72%.

Keywords: Cooling approaches, titania slag, granulating, sulfuric acid acidolysis,

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1132485

References:

[1] S. Watson, D. Beydoun, J. Scott, and R. Amal. Preparation of nanosized crystalline TiO2 particles at low temperature for photocatalysis. Journal of Nanoparticle Research. 2004, pp. 193-207.
[2] S. Yang, Y. Liu, Y. Guo, J. Zhao. Preparation of rutile titania nanocrystals by liquid method at room temperature. Materials Chemistry & Physics. 2003, pp. 501-506.
[3] D. Bessinger, J. M. A. Geldenhuis, P. C. Pistorius, A. Mulaba, and G. Hearne. The decrepitation of solidified high titania slags. Journal of Non-Crystalline Solids. 2001, pp. 132-142.
[4] B. Song, X. W. Lv, J. Xu, H. J. Miao and K. X. Han. Effect of wet grinding on carbothermic reduction of ilmenite concentrate. International Journal of Mineral processing, 2015, pp. 101-106.
[5] X. Wu, and J. Zhang. Geographical distribution and characteristics of titanium resources in chins. Titanium Industry Progress, 2006, pp. 8-12.
[6] P. N. Bungu, and P. C. Pistorius. Mineralogy and inititan chlorination of water granulated high titania slag. Canadian Metallurgical Quarterly. 2009, pp. 45-52.
[7] D. Bessinger, P. Beukes, P. Glenewinke. Granulation of titania slag. The 6th International Heavy Minerals Conference ‘Back to Basics’, The Southern African Institute of Mining and Metallurgy, 2007, pp.159-162.
[8] H. Kotze, P. C.Pistorius. A heat transfer model for high titania slag blocks. The Journal of the SouthernAfrican Institute of Mining and Metallurgy. 2007, pp.57-66.
[9] H. Kotze. Investgation into the effect of cooling conditions on the particle size distribution of titania slag. University of prretoria, 2007, pp. 90-95.
[10] Y. R. Liu, J. L. Zhang, Z. J. Liu, and X. D. Xing. Phase transformation behavior of titanium during carbothermic reduction of titanomagnetite ironsand. International Journal of Minerals, Metallurgy and Materials. 2016, pp. 760-768.
[11] T. Lei, J. R. Mi, L. Zhou, Y. H. Yang, and Y. L. Zhang. Study on Phase Compositions and Removal Impurities Mechanism of Electro-Titanium slag. Chinese Jiurnal Of Rare Metals, 2007, pp. 93-97.
[12] Y. H. Yang, T. Lei, J. R. Mi, L. Zhou. Studying on Phase Compositions and Formation Mechanism of Electro-Titanium slag. Yunnan Metallurgy,2006, pp. 35-37.
[13] F. C. Xu, Y. L. Liao, Y. Lei. Influence of modification on phase composition of titania slag. Titanium Industry Progress, 2011, pp. 21-24.
[14] Y. J. Wang, S. M. Wen, and Q. C. Feng. Mineral phase reconstruction behavior of direct reduction and smelting titania slag at high temperature and slow cooling. Rare Metals. 2015, pp. 440-444.
[15] W. Zhang. Selective separation of rutile phase in modified high titania slag. Northeastern University. 2010.
[16] B. Wang, X. Z. Cheng, K. X. Han, X. H. Qin, and Y. Ma. Research of acidolysis performance of acid-soluble titania slag. Iron Steel Vanadium Titanium, 2003, pp. 39-45.
[17] T. A. Lasheen, E. A. Saad, M. E. H. Shalabi, and W. M. Abo-Elhamd. New development in leaching of ilmenite ore and titania slag mixture using sulfate process. Egyptian Journal of Pure and Applied Science. 2015, pp. 18-21.
[18] J. H. Guo, X. C. Shen, L. Y. Wu. W. J. Zheng. The accelerated crystal phase transition for rutile-titania. Chinese Journal of Applied Chemistry. 2003, pp. 647-650.
[19] L. L. Sui, Y. C. Zhai, and L. H. Miao. Recovery of titania from high titania slag by roasting method using concentrted sulfuric acid. Rare Metals. 2015, pp. 895-900.