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12CaO·7Al2O3晶體結構及其氧化鋁浸出性能

Crystal structure and Al2O3 leaching properties of 12CaO·7Al2O3

  • 摘要: 使用分析純試劑配料,在1350℃保溫1 h的條件下合成了A/S=5(Al2O3與SiO2質量比)的鋁酸鈣熟料.研究了鈣鋁比C/A(除去與SiO2結合的CaO后CaO與Al2O3的摩爾比)對熟料中12CaO·7Al2O3晶體結構及其氧化鋁浸出性能的影響,并通過X射線衍射和X射線熒光等分析手段對其作用機理進行了探討.結果表明:由于12CaO·7Al2O3量的增加,C/A=1.0~1.4時,石灰燒結法熟料溶出率隨著C/A的提高而提高;在C/A=1.4時,熟料溶出率最高可達93.30%,此時CaO的缺失形成了有缺陷的12CaO·7Al2O3,且其中CaO的物質的量小于11.3 mol;鈣鋁比提高到1.7時熟料溶出率又出現了下降趨勢,這是由于CaO的飽和導致12CaO·7Al2O3晶體擇優生長取向發生變化,由(211)面開始向(420)晶面轉變.

     

    Abstract: Calcium aluminate clinkers, in which the mass ratio of Al2O3 to SiO2(A/S) is 5, were prepared at 1500℃ for 1h by proportioning pure reagents. The alumina leaching properties and crystal structure of 12CaO·7Al2O3 in the clinkers with different molar ratios of CaO unbonded with SiO2 to Al2O3 (C/A) were studied. The effect mechanism of C/A on the clinkers was also discussed by X-ray diffraction and X-ray fluorescence analysis. When C/A is 1.0 to 1.4, the alumina-leaching ratio improves because the amount of 12CaO·7Al2O3 increases with increasing C/A. When C/A is 1.4, the alumina-leaching ratio reaches the maximum value of 93.30%. In this case, 12CaO·7Al2O3 with defects forms, and the amount of substance of CaO is less than 11.3 mol. With the further increase of C/A, the alumina-leaching ratio decreases, which is because the preferred orientation of 12CaO·7Al2O3 changes from the (211) crystal plane into the (420) crystal plane.

     

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