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Metals 2017, 7(5), 181; doi:10.3390/met7050181

Effect of Calcium Oxide on the Crushing Strength, Reduction, and Smelting Performance of High-Chromium Vanadium–Titanium Magnetite Pellets

1
School of Metallurgy, Northeastern University, Shenyang 110819, China
2
Liaoning Key Laboratory of Recycling Science for Metallurgical Resources, Shenyang 110819, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Ian Baker
Received: 18 March 2017 / Revised: 16 May 2017 / Accepted: 17 May 2017 / Published: 19 May 2017
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Abstract

The effect of calcium oxide on the crushing strength, reduction, and smelting performance of high-chromium vanadium–titanium magnetite pellets (HCVTMP) was studied in this work. The main characterization methods of an electronic universal testing machine (EUTM), X-ray fluorescent (XRF), inductively-coupled plasma-atomic emission spectroscopy (ICP-AES), X-ray diffraction (XRD), and scanning electron microscope-energy disperse spectroscopy (SEM-EDS) were employed. The crushing strength was affected by the mineral phases generated during oxidative baking and the subsequently-formed pellet microstructures owing to CaO addition. The reduction and smelting properties of HCVTMP with different CaO additives were measured and characterized with different softening-melting-dripping indices. Although HCVTMP showed the highest crushing strength with CaO addition of ca. 2 wt %, more CaO addition may be needed to achieve high permeability of the furnace burdens and a good separation condition of the slag and melted iron. In the formation process of the slag and melted iron, it can be determined that CaO could have a relationship with the transformation behavior of Cr, V, and Ti to some extent, with respect to the predominant chemical composition analysis of ICP-AES and XRF. With the microscopic examination, the restraining formation of Ti(C,N) and the promoting formation of CaTiO3 are in accordance with the improved melting-dripping indices, including the decrease of the maximum external static load and gas permeability, and the increase of the melting-dripping zone and dripping difficulty. View Full-Text
Keywords: high-chromium vanadium–titanium magnetite; calcium oxide; crushing strength; reduction and smelting high-chromium vanadium–titanium magnetite; calcium oxide; crushing strength; reduction and smelting
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Cheng, G.; Gao, Z.; Yang, H.; Xue, X. Effect of Calcium Oxide on the Crushing Strength, Reduction, and Smelting Performance of High-Chromium Vanadium–Titanium Magnetite Pellets. Metals 2017, 7, 181.

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