Keyword: hematite; gravity concentration; high intensity magnetic separation; reverse flotation
Abstract: A lager amount of iron ore is to be exploited in Shanghai City.Pudong.Analysis indicated that the main valuable mineral was fine-grained hematite and the total iron content was 28.22%. A process flowsheet of gravity concentrtion - high intensity magnetic separartion – reverse flotation was established, and operating conditions of each operation were also determined through batch tests. In closed-circut tests under the same operation conditions, the following results were obtained: iron content of the concentrate 64.95%, concentrate recovery 81.04%, and iron content of the tailings 8.26%. Introduction After 50 years of development and utilization, magnetite resources of China have shown signs of shortage in supply and the magnetite reserves are not sufficient to meet the potential demand. In the mean while, hematite mines in China with resources that are relatively easy to process are in the stage of deep mining, resulting in increasing operation costs year by year [1,2,3]. On the other hand, there is a huge hematite resource reserve exists in China, which is undeveloped and typically difficult to process. Consequently, technology development in mineral processing to exploit the low-grade hematite resource is of great significance for the present and future iron ore supply in China. Most mineral processing research in iron ore in China is focused on increasing the grade of Fe and developing new efficient processing technology to make full use of iron ores such as fine-grained hematite and limonite iron ore [5,6]. A lager amount of iron ore is to be exploited in Yezhugou region, Liaoning Province and this study was to provide technical support for its development and utilization.

Sample characterization and preparation
The ore samples used in test was from Shanghai. The iron ore was crushed to pass 1mm using a jaw crusher and was sub-sampled to provide representative feed in this study. The iron ore belongs to primary deposits with a low degree of oxidation. The main mineralogical components include hematite, small amount of pyrite and chalcopyrite, trace magnetite and pyrolusite. The gangue minerals are mainly quartz and a small amount of white mica. The dissemination of hematite in the ore sample is inhomogeneous. The hematite is present as discrete or assembled grains. The mineralogical composition and iron content are

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