Magnetite beneficiation process

[Process introduction]: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.

[Application areas]:The magnetite beneficiation process can be applied to a single magnetite ore with simple ore properties.

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Process introduction

Process method

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.

Strong magnetic iron ore beneficiation process

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%.

Weakly magnetic iron ore beneficiation process

After magnetization and roasting, weak magnetic minerals can be sorted using the same method as strong magnetic minerals.

finely ground

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%.

Production instance

Taking a magnetite in Inner Mongolia as an example, the main metal mineral is magnetite, the structure is mainly disseminated structure, the particle size is fine, and the average iron content is 12-16%. The dressing plant uses the grinding-weak magnetic separation process to obtain more than 65% of high-quality iron concentrate, with a recovery rate as high as 90%, which is an easy-to-select ore. After long-term operation, the cost of plant selection is relatively high. Therefore, Xinhai was entrusted with technical transformation. According to the fact that the crushing and grinding process accounts for 70-80% of the mineral processing cost, Xinhai adopts early harvesting and early throwing, staged grinding, and staged separation processes to successfully reduce the cost of the mineral processing plant while ensuring the original indicators. The specific indicators are compared as follows:

Before transformation: Process: three-stage grinding, three-stage magnetic separation, iron concentrate grade: 65.58%, iron concentrate recovery rate: 90.15
After transformation, process: stage grinding, stage separation, iron concentrate grade: 67.81%, iron concentrate recovery rate: 92.69%

Since the raw ore grade of this iron ore is low, the key to developing this mine is to use stage grinding and stage separation to reduce energy consumption and save production costs. Although the ore is finely ground, the grinding cost is not too high, and it has certain guiding significance for the development of similar low-grade iron ores with similar ore properties.