Influence of initial iron ore particle size on CO 2 gasification behavior and strength of ferro-coke
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ORIGINAL PAPER
Influence of initial iron ore particle size on CO2 gasification behavior and strength of ferro-coke Run-sheng Xu1,2 • Shu-liang Deng1 • Heng Zheng2 • Wei Wang1 • Ming-ming Song1 • Wei Xu3 Fang-fang Wang4,5
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Received: 16 July 2019 / Revised: 28 January 2020 / Accepted: 28 January 2020 China Iron and Steel Research Institute Group 2020
Abstract Highly reactive ferro-coke has been widely studied due to its contribution to the energy saving and emission reduction in blast furnace ironmaking. To optimize the coking process of ferro-coke and improve its metallurgical properties, it is necessary to clarify the influence of initial iron ore on the strength, micro-morphology and CO2 gasification reaction behavior of formed ferro-coke. The effects of initial iron ore particle size (0.50–1.00, 0.25–0.50 and 0.074–0.125 mm) on the CO2 gasification reaction of ferro-coke were analyzed using thermo-analysis technique. In addition, the effects of initial iron ore particle size on the strength and morphology of ferro-coke were investigated by drum test, digital microscopy and scanning electron microscopy. The results show that iron reduced from iron ore has a great promotion effect on the CO2 gasification reaction of ferrocoke. The smaller the particle size of initial iron ore, the more intense the gasification reaction, and the lower the starting temperature for gasification reaction of ferro-coke. The results of kinetic calculation show that the apparent activation energy of ferro-coke decreases with the decreasing particle size of blended iron ore. The particle size of initial iron ore has a great impact on the strength of ferro-coke. The ferro-coke prepared by 0.25–0.50 mm iron ore presents the best strength in this experiment. Keywords Ferro-coke Iron ore Particle size Strength Gasification reaction
1 Introduction At present, the iron and steel industry in China is the largest industrial energy consumer around the world [1]. Nearly 50% of the pig iron in the world was produced in & Wei Wang [email protected] & Fang-fang Wang [email protected] 1
State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
2
Chair of Metallurgy, Montanuniversita¨t Leoben, Leoben A-8700, Austria
3
Wuhan Iron and Steel Co., Ltd., Wuhan 430081, Hubei, China
4
School of Energy and Power Engineering, Beihang University, Beijing 100191, China
5
Ningbo Institute of Technology, Beihang University, Ningbo 315800, Zhejiang, China
China. In 2013, the iron and steel industry consumed 6.25 billion tons of standard coal and released 16.78 billion tons of CO2, accounting for 16.2% of China’s total CO2 emissions [2, 3]. Therefore, China has put forward higher requirements for the utilization of resources and environmental protection in iron and steel enterprises. Improving the utilization of energies (coal, ore, and coke) is one of the important measures to reduce greenhouse gas and pollutant emissions
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