Brief Introduction on Iron Ore Mines Mining Process

01One. Magnetic Iron Ore Mine Mining Process

1. Single magnetic iron ore mine mining process

Most of the iron ore minerals in the single magnetic iron ore mine are magnetite, which often separated by weak magnetic separation method.

For the large and medium-sized magnetic separation plants, one stage grinding-magnetic separation is often used when the grinding particle size is larger than 0.2 mm. The two-stage grinding-magnetic separation is used when the grinding particle size is less than 0.2mm. the stage grinding-magnetic separation can be used if the qualified tailings can be separated in the coarse grinding.

2. Polymetallic magnetic iron ore mine mining process

Polymetallic magnetic iron ore mine is often separated by the combined process of weak magnetic separation and flotation method, that is, recovering the iron ore mine by the weak magnetic separation method and recovering the sulfide or apatite by the flotation method.

The polymetallic magnetic iron ore mine mining process can be divided into two types: weak magnetic separation-flotation method and flotation-weak magnetic separation method. The difference is the coenobium directions of magnetite and sulfide are different. In the weak magnetic separation-flotation method, the coenobium mainly enters the iron concentrate. In the flotation-weak magnetic separation method, the coenobium mainly goes into the sulfide concentrate. Therefore, under the same grinding particle size, adopting the flotation-weak magnetic separation method can obtain the iron concentrate with lower sulfide content and the sulfide concentrate with a higher recovery rate.

02Two. Weakly Magnetic Iron Ore Mine Mining Process

1. Single weakly magnetic iron ore mine

◆ Roasting magnetic separation

Roasting magnetic separation method is one of the effective methods for separating weak magnetic iron ore from fine to fine particles (<0.02 mm). The magnetization roasting magnetic separation method should be used when the minerals in the iron ore mine are complex and it is difficult to get good indexes by other mineral processing methods. At present, strong magnetic separation, gravity separation, flotation method or combined process are commonly used for separation of ore fines.

◆ Gravity separation, flotation, strong magnetic separation or combined processes

Flotation is one of the common methods for separating the weakly magnetic iron ore mine from fine to ultra-fine particles, including positive flotation and reverse flotation. The former is suitable for quartzite hematite without easily floating gangue, while the latter is suitable for the weakly magnetic iron ore mine easily floating gangue ore.

Gravity separation and strong magnetic separation are mainly used to separate coarse (20-2 mm) and medium-grained weak magnetic iron ore mine. The gravity separation method used for the coarse and ultra-coarse (>20 mm) ore includes heavy medium separation or jigging separation. The medium to fine iron ore mines is separated by spiral concentrator, shaker table, fan-shaped chute and centrifugal concentrator. The strong magnetic separation of coarse and medium iron ore mines often adopt dry magnetic separator.

At present, because the concentrate grade of fine iron ore mine is not high by the strong magnetic separation method, and the unit processing capacity of gravity separation method is low, the strong magnetic separation-gravity separation joint process is often applied. The strong magnetic separation method is used to discard a large number of qualified tailings, and then gravity separation is used to further process the strong magnetic concentrate.

2. Polymetallic weakly magnetic iron ore mine

This kind of iron ore mines are generally recovered by the gravity separation, flotation, strong magnetic separation or combined processes, and the phosphorus or sulfide are recovered by flotation.

03Three. Magnetite-Hematite (Siderite) Iron Ore Mine Mining Process

1. Single magnetite-hematite (siderite) iron ore mine mining process

◆ Weak magnetic separation-gravity separation, flotation or strong magnetic separation

For the weak magnetic separation-flotation process, adopting the flotation first and then the weak magnetic separation can obtain the more stable production, which is also easy to operate and manage. For the weak magnetic separation-gravity separation process, it is suggested to adopt weak magnetic separation-strong magnetic separation or weak magnetic separation-strong magnetic separation- gravity separation process.

2.Polymetallic magnetite-hematite (siderite) iron ore mine mining process

The iron ore mine mining process of this kind of iron ore mine is the most complicated one. Generally, the combined process of weak magnetic separation and other methods is adopted, that is, using the weak magnetic separation to the recover the magnetite, the gravity separation, flotation or strong magnetic separation to recover the weak magnetic iron ore mine, flotation to recover the associated components.