Magnetite magnetic separation technology

 Magnetite is a very important mineral resource that plays an important role in industry and science. Therefore, rational selection of magnetite beneficiation technology and improving resource recovery rate are important ways to ensure magnet resources. This article will introduce you to several common ones to help you understand magnetite beneficiation technology.

Magnetite magnetic separation technology

Magnetic separation is the most common magnet ore beneficiation technology. Since magnetite is a ferromagnetic ore, it can be separated from non-magnetic impurities through a magnetic separation process. The process typically includes the following steps:

The magnet ore is first crushed into smaller particles and then finely ground into powder to increase the surface area for effective magnetic separation. The finely ground ore is processed through magnetic separation equipment. Various types of magnetic separation equipment are used in this process, such as magnetic plates and high-intensity magnetic separation equipment. These devices generate magnetic fields that separate magnetic minerals from other ores.

Magnetite magnetic gravity separation combined technology

Magnetic gravity separation is a supplement to the magnetic separation process and is mainly used to further improve the grade of magnet ore. Magnetic gravity selection can be divided into two stages: rough selection and selection, which are realized by multi-stage magnetic separators. The combined process typically includes the following steps:

1. Magnetic separation: After the magnet ore undergoes pretreatment of crushing and grinding, it enters the magnetic separator for magnetic separation to remove magnetic minerals (mainly magnetite) from the ore. Magnetic separation equipment, such as magnetic drums or high-intensity magnetic separators, can be used for this process.

2. Gravity separation: After magnetic separation, the non-magnetic part of the ore and the gangue minerals are gravity separated. This step takes advantage of the difference in specific gravity between magnetite and gangue minerals for separation. Gravity separation equipment such as spiral chutes or shakers can be used in this process.

Magnetite magnetic flotation combined mineral processing technology

Some magnet ores contain non-magnetic impurities such as silica or carbonate, and magnetic separation alone cannot completely remove these impurities. In this case, magnetic separation can be used in conjunction with flotation technology. This process is particularly suitable for situations where the magnetite contains complex or fine-grained gangue minerals that are difficult to effectively remove through magnetic separation alone. The combined process typically includes the following steps:

Magnetite flotation

After the magnet ore is ground, magnetic separation is performed to remove the magnetite from the ore. This step helps separate magnetic minerals from non-magnetic gangue minerals. The non-magnetic part and gangue minerals in the ore obtained after magnetic separation are carried out. During the flotation process, collectors are added to the slurry to selectively attach to the magnetite, causing it to float above while the gangue minerals remain in the tailings.

The magnetic separation concentrate and flotation tailings are dehydrated and dried separately to obtain the final concentrate.

Magnetite gravity beneficiation technology

Dense media beneficiation is a beneficiation technology based on the difference in mineral density in the ore. It can be used to separate heavy minerals such as barite from magnetite. This process typically includes the following steps:

Magnetite gravity separation

Magnetite ore is classified according to particle size and specific gravity after crushing and grinding. This step helps ensure proper particle size distribution for efficient gravity separation. The graded ore passes through gravity separation equipment, such as spiral chute or etc., to separate magnetite from gangue minerals. The obtained magnetite concentrate is dehydrated and dried to obtain the final concentrate.

Magnetic gravity flotation combined mineral processing

This is a relatively complex magnetite ore beneficiation process that combines multiple technologies such as magnetic separation, dense medium beneficiation and flotation. This combined process is particularly suitable for magnet ores containing complex or fine-grained gangue minerals that are difficult to separate through separate beneficiation methods. It usually includes the following steps:

Magnetite flotation

The magnet ore is crushed and finely ground and then magnetically separated. The non-magnetic part of the ore obtained after magnetic separation is gravity separated from the gangue minerals to separate the valuable magnetite from the gangue minerals. The gravity-separated tailings still contain gangue minerals, which are subjected to a flotation process. During the flotation process, collectors are added to the slurry to selectively attach to the magnetite, causing it to float above. The obtained magnetic concentrate and flotation concentrate are dehydrated and dried respectively to obtain the final concentrate.