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<p>In this paper, the iron-ore coal composite briquette (ICCB) for blast furnace (BF) was prepared using high-silica ore fines and non-coking coal fines with a method of cold briquetting followed by heat treatment. The cold-crushing strength of the ICCB was 1870 N/briquette and the ICCB was bounded by the sintered matrix. Tests under BF simulation conditions showed that the ICCB qualified as a BF burden. In the tests, the binding mechanism of the ICCB was attributed to the sintered matrix, slag network, and iron network, and the formation of fayalite played an important role to keep a high strength. Numerical simulation results indicated that, by charging ICCB in BF, the temperature increase of the BF burden will be delayed in the temperature range from 873 to 1335&#xa0;K, and the ICCB did not have negative effects on the flow of molten iron and slag in the lower BF part, and in the temperature from 953 to 1283&#xa0;K, the solution-loss reaction of coke was suppressed and the reduction of sinter was prompted.</p>

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Preparation of Iron-Ore Coal Composite Briquette Using High-Silica Hematite and Non-Coking Coal and Its Application in Blast Furnace

  • 期刊论文

  • 发表日期：

    2025年1月24日

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  • Ting Zhang,
  • Siyuan Cheng,
  • Huiqing Tang

摘要

In this paper, the iron-ore coal composite briquette (ICCB) for blast furnace (BF) was prepared using high-silica ore fines and non-coking coal fines with a method of cold briquetting followed by heat treatment. The cold-crushing strength of the ICCB was 1870 N/briquette and the ICCB was bounded by the sintered matrix. Tests under BF simulation conditions showed that the ICCB qualified as a BF burden. In the tests, the binding mechanism of the ICCB was attributed to the sintered matrix, slag network, and iron network, and the formation of fayalite played an important role to keep a high strength. Numerical simulation results indicated that, by charging ICCB in BF, the temperature increase of the BF burden will be delayed in the temperature range from 873 to 1335 K, and the ICCB did not have negative effects on the flow of molten iron and slag in the lower BF part, and in the temperature from 953 to 1283 K, the solution-loss reaction of coke was suppressed and the reduction of sinter was prompted.