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含鈦電爐熔分渣堿熔過程中Ti元素的選擇性富集及MgAl2O4的物相轉化規律

Selective enrichment of Ti element and phase transformation of MgAl2O4 in titanium-containing electric furnace molten slag during the alkali fusion process

  • 摘要: 以KOH為改性劑,利用渣堿共熔反應對攀鋼含鈦電爐熔分渣進行改性處理,成功地將爐渣中Ti元素從原來的重鈦酸鎂選擇性地富集到偏鈦酸鉀中,同時渣中鎂鋁尖晶石和鎂橄欖石轉化為易溶于水的鋁酸鹽和硅酸鹽.采用X射線衍射技術研究了共熔反應中煅燒溫度、渣堿比(含鈦電爐熔分渣的質量與KOH質量之比)、保溫時間等對Ti元素遷移富集和鎂鋁尖晶石轉化的影響.當渣堿比為1∶2.1、煅燒溫度700℃及保溫時間1 h時,生成的偏鈦酸鉀衍射峰達到最強,鎂鋁尖晶石的衍射峰最弱,有效地實現了Ti元素的選擇性富集及鎂鋁尖晶石的物相轉化.實驗證實了較高K/Ti比(K2O與TiO2的摩爾比)是生成偏鈦酸鉀的主要原因.以最佳堿熔條件下得到的共熔渣為原料,經過后續處理,在850℃的條件下合成了六鈦酸鉀納米晶須.

     

    Abstract: Using potassium hydroxide as a modifier, Ti element was selectively enriched in potassium metatitanate from titanium-containing electric furnace molten slag, and magnesium aluminium spinel and forsterite were successfully converted to aluminates and silicates after the alkali fusion reaction between potassium hydroxide and the slag. The effects of calcining time, alkali/slag mass ratio and calcining temperature on the enrichment of Ti element and the phase transformation of magnesium aluminate spinel were investiga-ted by X-ray diffraction analysis. When the alkali/slag mass ratio is controlled at 1:2.1, the calcining temperature is 700℃ and the calcining time is 1 h, the highest diffraction peak of potassium metatitanate and the lowest diffraction peak of magnesium aluminium spinel appear, suggesting that the selective enrichment of Ti element and the phase transformation of magnesium aluminium spinel are efficiently realized. It is verified that a higher molar ratio of K2O to TiO2 plays an important role in the formation of potassium metati-tanate. Using this alkali fusion slag obtained under the optimum conditions as raw materials, potassium hexatitanate nanowhiskers can be successfully synthesized by subsequent processing at 850℃.

     

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