The magnetite beneficiation method occupies a dominant position in iron ore separation. Xingaonai uses gravity separation, magnetic separation, flotation and roasting magnetic separation, as well as combined processes for weakly magnetic lean iron ore; for strong magnetic iron ore, it directly Processed by magnetic separation.
The magnetite beneficiation process can be applied to a single magnetite ore with simple ore properties.
According to the magnetic strength of the ore, an ore beneficiation process method that adapts to its properties is selected. The magnetic separation process is used as the main process method, and the combination of gravity separation, flotation, roasting magnetic separation, etc. is a combined process method. The ore selection and separation has a basis.
It is mainly used to select low-grade magnetite. Since the ore has strong magnetism and is easy to grind and select, current-stage grinding is mostly used for coarse-grained magnetite, and multi-stage grinding process is used on the contrary. Currently, xingaonai promotes The fine grinding technology can increase the concentrate grade from 61% to about 67%.
After magnetization and roasting, weak magnetic minerals can be sorted using the same method as strong magnetic minerals.
In the two-stage grinding, stage separation, and single weak magnetic separation process, a regrinding and reselection process on a fine screen is added, which can separate the fine-grained minerals that have reached monomer dissociation in a timely manner and reduce the occurrence of over-grinding. , improved processing capacity, and at the same time, the concentrate grade can be increased by about 2%.
Taking a magnetite mine in Inner Mongolia as an example, the main metal mineral is magnetite, the structure is mainly inlaid structure, the particle size is fine, and the average iron content is 12-16%. The concentrator adopts the grinding-weak magnetic separation process, which can obtain more than 65% high-quality iron concentrate, with a recovery rate of up to 90%, which is an easy-to-select ore. After long-term operation, the concentrator has a high beneficiation cost, so Xingaonai group was commissioned to carry out technical transformation. In view of the fact that the crushing and grinding process accounts for 70-80% of the beneficiation cost, Xingaonai group adopts early mining and early throwing, segmented grinding, and segmented separation process, which successfully reduces the cost of the concentrator while ensuring the original indicators. The specific indicators are compared as follows:
Before the transformation: process: three-stage grinding, three-stage magnetic separation, iron concentrate grade: 65.58%, iron concentrate recovery rate: 90.15
After the transformation, process: stage grinding, stage beneficiation, iron concentrate grade: 67.81%, iron concentrate recovery rate: 92.69%
Due to the low grade of the original ore of this iron ore, the key to the development of this mine is to adopt stage grinding and stage beneficiation to reduce energy consumption and save production costs. Although the ore is finely ground, the grinding cost is not too high, which has certain guiding significance for the development of low-grade iron ore with similar ore properties.
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