Abstract: The aluminum increasing and iron reduction research on Shanxi a bauxite was carried out.The results show it could increase the Al₂O₃ grade from 64.80% to 72.57%，the recovery rate comes to 86.86%,while the concent of Fe₂O₃ decrease from 3.28% to 1.81%，the removal rate reaches to 57.20% when deal with the ore with one roughing,one cleaning，one scavenging and one high gradient magnetic separation.Appropriate grinding fineness is the guarantee of ideal separation index,sodium hexametaphosphate and RL flotation play a leading role in flotation to increasing aluminum，and sodium hexametaphosphate makes remarkable dispersion in the strong magnetic separation for iron reduction.

Key words: Bauxite, Flotation, High intensity magnetic separation