Determination of dielectric properties of titanium carbide fabricated by microwave synthesis with Ti-bearing blast furna
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Determination of dielectric properties of titanium carbide fabricated by microwave synthesis with Ti-bearing blast furnace slag Peng Liu 1,2,3,4), Li-bo Zhang 1,2,3,4), Bing-guo Liu 1,2,3,4), Guang-jun He 1,2,3,4,5), Jin-hui Peng 1,2,3,4), and Meng-yang Huang 6) 1) State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China 2) Yunnan Provincial Key Laboratory of Intensification Metallurgy, Kunming 650093, China 3) National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology, Kunming 650093, China 4) Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China 5) Faculty of Science, Kunming University of Science and Technology, Kunming 650500, China 6) Yunnan Energy Research Institute Co., Ltd., Kunming 650093, China (Received: 24 October 2019; revised: 8 January 2020; accepted: 9 January 2020)
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 π 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
1. Introduction Titanomagnetite is a complex iron ore [1–2] mainly concentrated in Russia, China, South Africa, and the United States. In China, Panzhihua titanomagnetite reserves are about 9.66 billion tons [3–5], and the titanium and vanadium deposits account for 35.17wt% and 11.6wt% of the world’s total reserves, respectively. At present, the main way to utilize titanomagnetite is the blast furnace smelting process [6]. Pelletizing concentrate is smelted by a blast furnace to produce hot metal and about 600000 t of Ti-bearing (22wt%–25wt%) blast furnace slag every year [7–8]. The blast furnace slag composition is complex and the titanium oxide phase distribution is dispersive. With the existing technology, blast furnace slag can be used as building materials, but this will cause a waste of titanium resources. Rutile or dye-grade titanium dioxide (TiO2) can also be prepared by the wet process [9–10], b
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