Mining of Mineral Deposits

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Influence of biocoke on iron ore sintering performance and strength properties of sinter

Lina Kieush1,2, Andrii Koveria3, Maksym Boyko4 , Maksym Yaholnyk4, Andrii Hrubiak5, Lavr Molchanov6, Volodymyr Moklyak5

1National Metallurgical Academy of Ukraine, Dnipro, Ukraine

2Montanuniversität Leoben, Leoben, Austria

3Dnіpro University of Technology, Dnipro, Ukraine

4Ukrainian State University of Science and Technologies, Dnipro, Ukraine

5G.V. Kurdyumov Institute for Metal Physics of the National Academy of Sciences of Ukraine, Kyiv, Ukraine

6Iron and Steel Institute of Z.I. Nekrasov of the National Academy of Sciences of Ukraine, Dnipro, Ukraine


Min. miner. depos. 2022, 16(2):55-63


https://doi.org/10.33271/mining16.02.055

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      ABSTRACT

      Purpose. The research purpose is to substantiate the use of biocoke as a fuel in the iron ore sintering, as well as its influence on the performance and properties of the resulting sinter. To completely replace conventional coke breeze, biocoke is produced using 5 wt.% biomass wood pellets at different carbonization temperatures of 950 or 1100°C. Further, the influence of biocoke on the sintering process and the sinter quality is studied at a high proportion of biomass pellets of 10, 15, 30, 45 wt.% and a carbonization temperature of 950°C.

      Methods. Carbonization is performed in shaft-type electric furnaces to produce laboratory coke or biocoke. Afterward, the sintering of iron ores is conducted on a sinter plant. To assess the sintering process and the quality of the resulting sinter, the filtration rate is determined on a laboratory sinter plant using a vane anemometer designed to measure the directional flow average velocity under industrial conditions. The sinter reducibility is studied using a vertical heating furnace to assess the effect of coke and biocoke on the sinter’s physical-chemical properties.

      Findings. It has been determined that biocoke, carbonized at a temperature of 950°C, has good prospects and potential for a shift to a sustainable process of iron ore sintering.

      Originality. It has been proven that biocoke with a biomass pellet ratio of up to 15 wt.%, obtained at a temperature of 950°C, does not affect the parameters characterizing the sintering process. The sinter strength indicators correspond to the use of 100 wt.% conventional coke breeze. Biocoke used with a high proportion of biomass pellets of 30 and 45 wt.% causes a deterioration in the sinter quality.

      Practical implications. The results of using biocoke with the addition of 5-15 wt.% biomass pellets and at a temperature of 950°C are within the standard deviation, which makes it possible to use biocoke with 15 wt.% biomass pellets instead of industrial coke breeze.

      Keywords: biocoke, coke breeze, iron ore sinter, sintering process, sintering performance, strength, wood pellets


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