Magnetic separation places the leading position in iron ore separation. For weak magnetic and lean iron, Xinhai adopts gravity separation, magnetic separation, flotation, and roasting magnetic separation used for strong magnetic iron ore and magnetic separation.
According to the ore magnetism, the suitable mineral processing technology is chosen. Magnetic separation is the main processing technology, cooperating with gravity separation, flotation, roasting magnetic separation as joine process method.
It is mainly used for low-grade magnetite ore. As for the strong ore magnetism, easy to grind and separate, the coarse-grained magnetite common uses two-stage grinding, othervise the multiple-stage grinding flow is used. At present, Xinhai fine grinding technology can increase 61% concentrate grade to 67%.
After magnetic roasting, weak magnetic ore can be separated by strong magnetic separation.
In the flow of two-stage grinding stage separation single weak magnetic separation, the fine grinding on-screen regrinding re-processing technology is added. It can separate the dissociated fine-grained minerals, reduceing over-grinding and increasing capacity. The concentrate grade can be increase about 2%.
Magnetite separation production line is used to single magnetite with simple ore properties.
Ilmenite Beneficiation Plant in Ecuador, a republic in northwestern South America, is one of our successful cases. This is 3D demo Video of the dressing plant created by our company.
A magnetite in Inner Mongolia, the main mental mineral was magnetite with disseminated structure and fine particle distribution. The iron content was about 12-16%. This plant adopted the grinding-weak magnetic process and obtained 65% concentrate grade and 90% recovery rate, but the operation cost was too high after a long time running. It authorized Xinhai to reform the process. Xinhai did not only keep the original indexes, but also reduced the operation costs. Indexes comparison are as following:
|Comparison of Reformation||Process||Iron Concentrate Grade|
|Iron Concentrate Recovery Rate|
|Before Reformation||Three stages grinding, Three stages magnetic separation||65.58||90.15|
|After Reformation||Stages grinding, stages separation||67.81||92.69|
Due to the low grade of the iron ore, the stages grinding and stages separation could reduce energy consumption. Cost saving is the key of developing the mine. The fine grinding process has guide significance for similar iron ore.
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