Addition of partial nephelite during bauxite sintering could not only make up consumption of soda, but also attain purpose for treating nephelite.
在铝土矿烧结过程中添加部分霞石矿，以补充碱的消耗，同时达到处理霞石的目的。
2
The stones were considered to be the corrosion products of refractory materials due to the fact that they exhibit mullite or nephelite characteristics under the microscope and are rich in alumina.