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含煤球團的冶金特性

Metallugical Characters on Coal-Bearing Pellets

  • 摘要: 采用熱天平裝置及單個球團加熱的方法,測定了含碳球團的還原速度。研究了加熱溫度、球團配碳量、爐氣組成、添加劑、原料種類等對含碳球團的還原速度和金屬化率的影響及球團的冶金特性。實驗結果表明:含碳球團的軟化和熔化溫度較高,含碳15%以上的球團在1000~1350℃加熱時,在含CO2較高的高溫爐氣中也能夠實現快速自還原,達到較高的金屬化率。該球團的金屬化率隨加熱溫度提高而增加。研制出一種含煤25%的冷固結鐵礦球團,其單個干球抗壓強度已達1000N以上,有良好的冶金性能,可用于豎爐型煉鐵設備作冶煉鐵水的原料,還原劑焦碳也可用非焦煤代替。

     

    Abstract: The rates of the reduction of carbon-bearing pellets have been determined with a thermalbalance test instrument and heating method of a single pellet. The effects of heating temperature, carbon contents of pellet, composition of furnace gas, additives, and the kinds of raw materials on the rates of reduction, final metallizing rates and metallurgical characteristics of carbon-bearing pellets have also been investigated. The results of the experiments show that the softening temperature and melting temperature of the pellet are higher than coventional pellet's temperature. There is a procedure of gas-releasing when the pellets containing >15%C are heated in the temperature range of 1000℃ to 1350℃.The pellets can be self-reduced rapidly in the furnace gas with a high temperature and high contents of CO2. A high metallizing ratio can be obtained. The final metallizing ratio of pelletes increases with the increase of heating temperature. This new type of pellet with very good metallurgical characters can be used directly as a raw material of ironmaking shaft furnace, in which coke can be replaced by a wide ranges of raw coals.

     

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