Determination of dielectric properties of titanium carbide fabricated by microwave synthesis with Ti-bearing blast furnace slag

Abstract

The preparation of functional material titanium carbide by the carbothermal reduction of Ti-bearing blast furnace slag with microwave heating is an effective method for valuable metals recovery; it can alleviate the environmental pressure caused by slag stocking. The dynamic dielectric parameters of Ti-bearing blast furnace slag/pulverized coal mixture under high-temperature heating are measured by the cylindrical resonant cavity perturbation method. Combining the transient dipole and large n bond delocalization polarization phenomena, the interaction mechanism of the microwave macroscopic non-thermal effect on the titanium carbide synthesis reaction was revealed. The material thickness range during microwave heating was optimized by the joint analysis of penetration depth and reflection loss, which is of great significance to the design of the microwave reactor for the carbothermal reduction of Ti-bearing blast furnace slag.

Keywords

titanium-bearing blast furnace slag / dielectric mechanism / penetration depth / reflection loss / microwave heating / efficiency

References

[1] Wang YZ, Zhang JL, Liu ZJ, Du CB. Carbothermic reduction reactions at the metal-slag interface in Ti-bearing slag from a blast furnace. JOM, 2017, 69(11): 2397.

[2] Liu JX, Cheng GJ, Liu ZG, Chu MS, Xue XX. Reduction process of pellet containing high chromic vanadium-titanium magnetite in cohesive zone. Steel Res. Int., 2015, 86(7): 808.

[3] Wang S, Guo YF, Jiang T, Yang L, Chen F, Zheng FQ, Xie XL, Tang MJ. Reduction behaviors of iron, vanadium and titanium oxides in smelting of vanadium titanomagnetite metallized pellets. JOM, 2017, 69(9): 1646.

[4] Wang S, Chen M, Guo YF, Jiang T, Zhao BJ. Reduction and smelting of vanadium titanomagnetite metallized pellets. JOM, 2019, 71(3): 1144.

[5] Zhang YM, Wang LN, Chen DS, Wang WJ, Liu YH, Zhao HX, Qi T. A method for recovery of iron, titanium, and vanadium from vanadium-bearing titanomagnetite. Int. J. Miner. Metall. Mater., 2018, 25(2): 131.

[6] Zhou M, Jiang T, Yang ST, Xue XX. Vanadium-titanium magnetite ore blend optimization for sinter strength based on iron ore basic sintering characteristics. Int. J. Miner. Process., 2015, 142, 125.

[7] Lv C, Yang K, Wen SM, Bai SJ, Feng QC. A new technique for preparation of high-grade titanium slag from titanomagnetite concentrate by reduction-melting-magnetic separation processing. JOM, 2017, 69(10): 1801.

[8] Lü HH, Wu MZ, Zhang ZL, Wu XR, Li LS, Gao ZF. Co-precipitation behaviour of titanium-containing silicate solution. Chem. Pap., 2016, 70(12): 1632.

[9] Zhang YJ, Qi T, Zhang Y. A novel preparation of titanium dioxide from titanium slag. Hydrometallurgy, 2009, 96(1–2): 52.

[10] Guo YF, Li SS, Jiang T, Qiu GZ, Chen F. A process for producing synthetic rutile from Panzhihua titanium slag. Hydrometallurgy, 2014, 147–148, 134.

[11] Wang D, Chu JL, Li J, Qi T, Wang WJ. Anti-caking in the production of titanium dioxide using low-grade titanium slag via the NaOH molten salt method. Powder Technol., 2012, 232, 99.

[12] Jiang T, Xue XX, Duan PN, Liu X, Zhang SH, Liu R. Carbothermal reduction-nitridation of titania-bearing blast furnace slag. Ceram. Int., 2008, 34(7): 1643.

[13] Chen G, Chen J, Peng JH. Effects of mechanical activation on structural and microwave absorbing characteristics of high titanium slag. Powder Technol., 2015, 286, 218.

[14] Cheng CB, Fan RH, Wang ZY, Shao Q, Guo XK, Xie PT, Yin YS, Zhang YL, An LQ, Lei YH, Ryu JE, Shankar A, Guo ZH. Tunable and weakly negative permittivity in carbon/silicon nitride composites with different carbonizing temperatures. Carbon, 2017, 125, 103.

[15] Ono T, Ueki M. Somiya S. Effect of graphite addition on the microstructure and mechanical properties of hot-pressed titanium carbide. Advanced Materials’ 93. Ceramics, Powders, Corrosion and Advanced Processing, 1994, Amsterdam, Netherlands, Elsevier, 585.

[16] Shul’pekov AM, Lyamina GV. Electrical and thermomechanical properties of materials based on nonstoichiometric titanium carbide prepared by self-propagating high-temperature synthesis. Inorg. Mater., 2011, 47(7): 722.

[17] Pan L, Shoji T, Nagataki A, Nakayama Y. Field emission properties of titanium carbide coated carbon nanotube arrays. Adv. Eng. Mater., 2007, 9(7): 584.

[18] Peng ZW, Hwang JY, Kim BG, Mouris J, Hutcheon R. Microwave absorption capability of high volatile bituminous coal during pyrolyisis. Energy Fuels, 2012, 26(8): 5146.

[19] Dudley GB, Richert R, Stiegman AE. On the existence of and mechanism for microwave-specific reaction rate enhancement. Chem. Sci., 2015, 6(4): 2144.

[20] Damm M, Kappe CO. Parallel microwave chemistry in silicon carbide reactor platforms: An in-depth investigation into heating characteristics. Mol. Diversity, 2009, 13(4): 529.

[21] Kuhnen CA, Dall’Oglio EL, de Sousa PT. Quantum tunneling contribution for the activation energy in microwave-induced reactions. J. Phys. Chem. A, 2017, 121(30): 5735.

[22] Li SH, Akyel C, Bosisio RG. Precise calculations and measurements on the complex dielectric constant of lossy materials using TM₀₁₀ cavity perturbation techniques. IEEE Trans. Microwave Theory Tech., 1981, 29(10): 1041.

[23] Zhang YP, Li E, Zhang J, Yu CY, Zheng H, Guo GF. A broadband variable-temperature test system for complex permittivity measurements of solid and powder materials. Rev. Sci. Instrum., 2018, 89(2): 024701. art. No.

[24] Dielectric Constant [2010-12-14]. http://www.vias.org/encyclopedia/phys_dielectric_const.htm

[25] Buchner R, Barthel J, Stauber J. The dielectric relaxation of water between 0°C and 35°C. Chem. Phys. Lett., 1999, 306(1–2): 57.

[26] Meissner T, Wentz FJ. The complex dielectric constant of pure and sea water from microwave satellite observations. IEEE Trans. Geosci. Remote Sens., 2004, 42(9): 1836.

[27] Chen JW, Jiao Y, Wang XD. Thermodynamic studies on gas-based reduction of vanadium titano-magnetite pellets. Int. J. Miner. Metall. Mater., 2019, 26(7): 822.

[28] Peng ZW, Lin XL, Li ZY, Hwang JY, Kim BG, Zhang YB, Li GH, Jiang T. Dielectric characterization of Indonesian low-rank coal for microwave processing. Fuel Process. Technol., 2017, 156, 171.

[29] Beneroso D, Albero-Ortiz A, Monzó-Cabrera J, Díaz-Morcillo A, Arenillas A, Menéndez JA. Dielectric characterization of biodegradable wastes during pyrolysis. Fuel, 2016, 172, 146.

[30] Zhang XL, Hayward DO, Mingos DMP. Microwave dielectric heating behavior of supported MoS₂ and Pt catalysts. Ind. Eng. Chem. Res., 2001, 40(13): 2810.

[31] Meredith R. Engineers’ Handbook of Industrial Microwave Heating, 1998, London, The Institution of Engineering and Technology

[32] Pozar DM. Microwave Engineering, 2011, 4th ed., New York, John Wiley & Sons. Inc.