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釩鈦燒結料床豎向不均勻燒結

Inhomogeneous vertical sintering of a sintering feed bed for vanadium-titanium magnetite

  • 摘要: 通過對釩鈦燒結料床的不同料層進行測溫,研究了不同深度燒結料成礦過程的溫度變化曲線,利用火焰前鋒速度和成礦前鋒速度兩個參數評價了臺車豎向燒結的不均勻程度.結果表明:隨著料層深度的增加,火焰前鋒和成礦前鋒遷移速度下降,說明臺車下部料床的結構變化大,燒結透氣性惡化;加強偏析布料效果,增大臺車下部料粒的平均粒度和熱態強度,對提高釩鈦礦燒結利用系數至關重要.同時,對不同深度處的燒結礦進行礦相分析表明,釩鈦燒結礦由磁鐵礦、赤鐵礦、鐵酸鈣、硅酸鈣、鈣鈦礦和玻璃相六種主要礦物組成,隨著料層深度的增加,磁鐵礦、硅酸鈣和鈣鈦礦含量增多,鐵酸鈣和赤鐵礦含量下降.

     

    Abstract: Changes in temperature of vanadium-titanium magnetite sintering feed at different depths during mineralization processes were studied by measuring the temperature values of different sintering layers.Two quantitative parameters,flame front speed and mineralization front speed,were defined to evaluate the inhomogeneous degree of vertical sintering.The results show that the flame front speed and mineralization front speed decrease with increasing layer depth,indicating that there is a serious structural change in the lower region of the sintering feed bed and the sintering permeability deteriorates.Promoting the charge segregation and increasing the mean diameter and thermal intensity of quasi-particles in the lower region of the sintering feed bed are of great importance for enhancing the sinter productivity.Simultaneously,mineralogical analysis of sinters at different sintering layers show that the vanadium-titanium magnetite sinter ore consists of magnetite,hematite,calcium ferrite,dicalcium silicate,perovskite,and vitreous mineral.With the layer depth increasing,the contents of magnetite,dicalcium silicate and perovskite increase,while the contents of hematite and calcium ferrite decrease.

     

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