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氧分壓對鐵礦粉燒結成礦的影響

Effect of oxygen partial pressure on the sintering process of iron ores

  • 摘要: 氧分壓一直是影響燒結礦質量的重要因素.通過控制不同氧分壓進行的燒結實驗結果表明:在氧化性氣氛下,生成的礦物主要有赤鐵礦和鐵酸鈣,出現了針狀鐵酸鈣晶形.氧分壓從7.10×10-4至7.89×10-5Pa時,礦物組成區別不大,只是在局部產生少量的磁鐵礦.氧分壓從4.44×10-5Pa開始,赤鐵礦明顯減少而磁鐵礦增加.在高堿度燒結礦中,為了獲得合理的燒結礦礦物組成與形態結構,氧分壓應控制在2.12×104~7.10×10-4Pa之間.

     

    Abstract: Oxygen partial pressure has important effect on the sintering process of iron ores. Sintering experiments were carried out in different atmosphere conditions. It is found that the mineral composition of the sinter is mainly hematite and calcium ferrite, and acicular calcium ferrite appears in a stronger oxidation atmosphere. No obvious difference in mineral composition while the oxygen partial pressure is in the range of 7.10×10-4 to 7.89×10-5 Pa, but magnetite appears in local region. When the oxygen partial pressure decreases from 4.44×10-5 Pa, magnetite obviously increases but hematite simultaneously decreases. To achieve an appropriate mineral composition and structure of high basicity sinter, the oxygen partial pressure should be controlled in the range of 2.12 ×104 to 7.10×10-4 Pa.

     

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