Experimental research on semi-coke for blast furnace injection
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ORIGINAL PAPER
Experimental research on semi‑coke for blast furnace injection Chun‑chao Huang1,2 · Xiao‑jun Ning1,3 · Guang‑wei Wang1,2 · Jian‑liang Zhang1,2 · Zheng‑fu Peng1,2 · Hai‑peng Teng1,2 Received: 6 January 2020 / Revised: 28 June 2020 / Accepted: 29 June 2020 © China Iron and Steel Research Institute Group 2020
Abstract The combustion properties and grindability of Shenmu low-rank coal (SM) and its four different semi-cokes were studied by the self-designed equipment and Hardgrove method. The four semi-cokes were obtained under the pyrolysis temperature of 400, 500, 600 and 700 °C, named as SM-400, SM-500, SM-600 and SM-700, respectively. The analyses of nitrogen adsorption, Fourier-transform infrared spectroscopy (FTIR) spectra and Raman spectra were carried out to explain the change in combustion ratio and grindability. The result showed that the specific surface area of samples had an essential effect on the combustion ratio of SM-400 and SM-500. Meanwhile, the grindability depended on the strength of coal matrix, and the augment of pore amounts would increase the grindability. The functional groups and graphitization degree of the same sample were identical with the combustion ratio. With the pyrolysis upgrading temperature increasing, the combustion ratio of sample decreased, corresponding to the decrease in the benzene ring and the increase in graphitization degree. In addition, the thermogravimetric analysis was carried out, and the result was compared against what was shown in the data of combustion ratio. For pulverized coal injection, the combustion ratio was more intuitive and more accurate than combustibility. Keywords Semi-coke · Combustion ratio · Functional group · Graphitization degree · Grindability
1 Introduction Ironmaking is the basis of the metallurgical industry, and the blast furnace (BF) ironmaking is the primary supplier in the field of iron and steel manufacturing. Statistically, the total output of the crude steel was 443.0 million tonnes in the first 3 months of 2020 of the world, about 6.0% decrease compared to the same time of 2019 [1, 2]. The downward trend can be ascribed to the COVID-19 pandemic. Regardless of the change in steel capacity, most of the crude steel production, about 64%, was produced by * Xiao‑jun Ning [email protected] * Guang‑wei Wang [email protected] 1
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
2
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
3
Guanzhuang Campus, University of Science and Technology Beijing, Beijing 100083, China
the integrated routes, which were blast furnace and basic oxygen furnace (BF-BOF) process [3]. The rest process, such as smelting reduction or direct reduction, accounts for only 5% of the crude steel production. As for China, in March 2020, the yield of crude steel was 79.0 Mt, a decrease of 1.7% compared with that in March 2019 [1]. With COVID-19 under control, the crud
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