As the application of dry scrubbing technique and large-scale central point-feeding pre-baked anode cell in modern electrolytic aluminum industry, raw material alumina is required for higher physical index which can be met by sandy alumina. Its major physical performance indexes are particle size -45μm﹤15% and attrition index﹤20%. So it is necessary to develop sandy alumina production technology suitable for the domestic bauxite resources and alumina production process, especially sandy alumina prod...