关键词: 低品级矿, 铝硅比（A/S）, 供配矿, 配矿法, 技术经济评价

Abstract: The Al/Si ratio of a stacked bauxite in an ore district varies greatly while the Bayer process for alumina strictely requires that the bauxite must have a Al/Si ratio greater than 7.Therefore, the mine is currently mining only the high grade bauxite.It is extremely urgent for the mine to rationally exploit and utilize its low grade bauxite resourece.In this research, a technical and economical assessment was made for this low grade bauxite resource from the aspects of external construction conditions, constructon plan, extraction process and bauxite supply and blending plan.It is concluded that the low grade bauxite can be rationally utilized by a comined blending method, which will not only effectively utilize the limited mineral resource and prolong the mine service life but will also bring remarkable social and economical benefits.It will perfect a full exploitation and utilization of karst stacked type bauxite and will be of popularization value for similar mines.

Key words: Low grade bauxite, A/S ration, Ore supply and blending, Ore blending method, Technical and economical assessment