Based on the study of the properties of a micro-grained dissemination magnetite ore in Qinghai province and the analysis and comparison of experiments,the experimental research of the beneficiation flowsheet was made,namely the flowsheet consisting of staged grinding and low intensity magnetic separation and anionic reverse flotation,which obtained concentrates having 62.

78% iron was separated in the laboratory by using the craft flow of staged grinding and classification-gravity separation-magnetic separation-anionic reverse flotation.

The paper describes the characteristics of the technological of Nanfen red iron ore,beneficiation test research and the results of enlarged continuous test of the flowsheet consisting of the staged grinding,low intensity magnetic separation,high intensity magnetie separation,anionic reverse flotation.

Application of anion reverse flotation in magnetic iron ore dressing to raise iron content and reduce silicon content in concentrate;

At present,two kinds of flowsheets are adopted in Qidashan Beneficiation Plant-"stage-wise grinding-gravity separation,magnetic separation and anion reverse flotation" and"continuous grinding-low intensity magnetic separation,high intensity magnetic separation and anion reverse flotation".

It is then determined that the flowsheet of stage-wise grinding—gravity separation—high intensity magnetic separation-anion reverse flotation is most reasonable for beneficiation of poor hematite from Gongchangling Mine.