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動態氧化條件下含鈦高爐熔渣中鈣鈦礦析出與長大機理

Precipitation and growth mechanism of perovskite phase in molten Ti-bearing blast furnace slag under dynamic oxidation condition

  • 摘要: 動態氧化不僅有利于含鈦高爐熔渣中鈦組分富集于設計相(鈣鈦礦相),同時還會促進鈣鈦礦相析出與粗化,在自然重力作用下粗化的鈣鈦礦實現重力富集與沉降分離.本文運用玻璃形成動力學方程,對動態氧化條件下含鈦熔渣中鈣鈦礦相形核速率和晶體生長速率進行分析和研究.結果表明,向熔渣鼓入氧氣,低價鈦逐漸氧化為四價鈦,促進鈣鈦礦析出反應的進行,提高了鈣鈦礦晶體生長速率.繼續通入氧氣則氧化時間過長,熔渣中高熔點TiC和TiN固體顆粒基本消失,黏度降低,異相形核轉化為均相形核,析出溫度顯著降低,析晶溫度區間縮短,不利于鈣鈦礦晶粒粗化和長大.

     

    Abstract: Dynamic oxidation is not only in favor of that Ti components in molten Ti-bearing blast furnace slag enrich into the design phase (perovskite), but also promotes the coarsening and growth of perovskite phase. The enrichment and settlement of coarsened perovskite are carried out under the action of gravity. The nucleation rate and the crystal growth rate of perovskite phase in molten Ti-bearing blast furnace slag under dynamic oxidation condition were studied by using the kinetic equation of glass formation. The results show that low valence titanium (Ti2+) and (Ti3+) are oxidized to (Ti4+) under dynamic oxidation condition by blowing oxygen, which can promote the precipitation of perovskite and increase the crystal growth rate. When continuing to blow oxygen, the oxidizing time would be too long, TiC and TiN particles decrease and finally almost vanish, the slag viscosity decreases, and the crystallization of perovskite phase transforms from heterogeneous nucleation into homogeneous nucleation. As a result, the precipitation temperature decreases and the precipitation temperature range shortens, which restrain the coarsening and growth of perovskite.

     

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