Beneficiation Plant / Beneficiation / Iron Ore Beneficiation

Technics of Hematite Dressing Plant

       Overview

       Hematite is weak magnetic. And it contains mainly Fe₂O₃. The normal chemical composition of hematite is Fe₂O₃, Fe₃O₄, SiO₂, Al₂O₃ and so on. Based on the test report of ore provided by customer, we designed this hematite dressing technics: three stages crushing----one stage milling----two stages magnetic separation----dehydration----final product. Using this technics, we can improve the Fe content from 40% up to 65%. And the ferric oxides recovery ratio is about 80%.

       Crushing and milling

       Ensure the quality of raw material. And the size of ore rock should be no bigger than 400mm. The first stage and second stage we use PE jaw crusher and PEX jaw crusher. The third stage we use a double roller crusher to reduce the rock size to smaller than 10mm. We use three stages crushing to reduce the size of rock as smaller as possible. In that way, milling the ore into required fineness, 150-200 mesh, is much easier. At the end of ball mill, the milling stage, there is a screen through which the qualified ore slurry can pass through. The slurry is then sent to a magnetic separator to pick out the magnetic part of the slurry.

       Magnetic Separation

       After milling, the qualified slurry runs into firs stage magnetic separator, magnetic density 3500Gauss. This machine can pick out Fe­­­₃O₄ out of the slurry and then Fe­­­₃O₄ is sent to the concentrated ore pool. We use a high gradient magnetic separator in the second stage separation to pick out Fe₂O₃, which is weak magnetic. The picked our slurry is sent to the concentrated ore pool. Then we use a pump pull the slurry into a disc type filter to dehydrate. The output of the filter is final product and water which can recycle. The final product contains about 5% moisture. It can be stored for further usage.

       Conclusion

       What is narrated above is designed based on the test report of ore sample. If there is a big difference between the current sample and the ore mine, we shall modify the technics.