Alumina dissolution into silicate slag

作者：Zhang Shaowei^*; Rezaie Hamid Reza; Sarpoolaky Hossain; Lee William Edward

来源：Journal of the American Ceramic Society, 2000, 83(4): 897-903.

DOI：10.1111/j.1151-2916.2000.tb01291.x

• Silicate slags

Dissolution of commercial white fused and tabular Al2O3 grains into a model silicate slag was investigated after 1 h at 1450° and 1600 °C. Formation of CA6 and hercynitic spinel layers was observed at all Al2O3/slag interfaces. The spinel layer was not always continuous, and so, compared with the CA6 layer, it had a less-significant effect on the dissolution process. The CA6 layer that formed adjacent to the tabular Al2O3 was incomplete at both temperatures, so that its dissolution was not a totally indirect process. These incomplete CA6 and spinel layers meant that slag penetrated into the tabular Al2O3 grains, which, thus, were corroded and disintegrated by the penetrating slag. There was evidence of liquid in the CA6 layer adjacent to the fused Al2O3 after 1 h at 1450 °C, which also enabled direct dissolution. After 1 h at 1600 °C, fused Al2O3 revealed a thick (approximately 60 μm), continuous and unpenetrated CA6 layer, indicating fully indirect dissolution at this temperature.

• 出版日期2000