Single magnetite and polymetallic magnetite beneficiation

Magnetite is mostly granular aggregates with strong magnetism and wide distribution. According to the different types of iron-containing minerals, magnetite can be divided into single magnetite and mixed ore.

Generally speaking, single magnetite mostly adopts weak magnetic separation process. Polymetallic magnetite and mixed ore are usually combined with flotation and magnetic separation.

1. Single magnetite: Most of the iron minerals in single magnetite are magnetite. The composition of the ore is simple, and the weak magnetic separation process is often used:

When the grinding particle size is greater than 0.2mm, most iron ore magnetic separation plants often adopt the primary grinding-magnetic separation process;

When the grinding particle size is less than 0.2mm, a two-stage grinding-magnetic separation process is adopted;

For arid and water-scarce areas, magnetite concentrators may consider adopting dry grinding-dry magnetic separation process;

For poor-rich magnetite or rich magnetite, dry magnetic separator can generally be used to remove gangue. Obtain massive rich ore, and then obtain concentrated ore through grinding-magnetic separation process.

2. Magnetite containing various metals: containing silicate or carbonate minerals, often associated with cobalt pyrite, chalcopyrite and apatite. Generally, the combined process of weak magnetic separation and flotation is adopted, that is, iron ore is recovered by weak magnetic separation, and sulfide or apatite is recovered by flotation.

For the weak magnetic separation-flotation process, the continuum mainly enters the iron concentrate;

For the flotation-weak magnetic separation process, the continuum mainly enters the sulfide concentrate.

In order to obtain high-grade concentrate, the magnetite concentrate can be subjected to flotation or impact fine screening. In order to improve the recovery rate, tailings reprocessing and other processes can be considered for further recovery.