Hematite combined beneficiation process

Although hematite is a weakly magnetic iron mineral, it is an important resource for obtaining iron. In terms of beneficiation, according to the ore properties of hematite, magnetic separation, flotation, gravity separation and magnetization roasting can be used for separation. Hematite, but because in the actual process, the thickness of some hematite and impurity minerals is uneven, and it also contains a small amount of magnetite, quartz, kaolin and other gangue minerals, the ore properties are more complex.

Therefore, in the above methods of sorting, the ideal hematite ore concentrate cannot be obtained by using a single method, and a combined beneficiation scheme is required for sorting. At present, the common hematite combined beneficiation process mainly includes the following three types:

1. Hematite continuous grinding - weak magnetic field - strong magnetic field - anion reverse flotation process

This technological process is mainly suitable for processing hematite ore with fine particle size embedded in the distribution. Fine particle size is required for grinding. Continuous grinding is required to completely dissociate the hematite ore, and then sorting operation is carried out.

After continuous grinding, use weak magnetic separation-strong magnetic separation process to remove the primary and secondary slimes in the grinding products, throw away a large amount of tailings, and then carry out reverse flotation process to separate hematite ore concentrate.

The hematite beneficiation process is easy to obtain better separation index. At present, strong magnetic operation equipment is an ideal choice for hematite tailing equipment, and anion reverse flotation is an ideal separation operation for hematite beneficiation to obtain high-grade iron concentrate.

2. Hematite stage grinding-coarse and fine separation-gravity-magnetic-anion reverse flotation process

This technological process is highly pertinent. Minerals dissociate in a random state during the grinding process. Minerals that have reached monomer dissociation under rough grinding conditions should be sorted as early as possible.

The process is mainly that the raw ore enters the hydrocyclone for classification after primary grinding, and the obtained coarse-grained hematite is re-selected by spiral chute to obtain coarse-grained hematite concentrate; fine-grained hematite enters the weak Magnetic-strong magnetic-reverse flotation process to obtain high-grade fine-grained hematite concentrate.

3. Hematite stage grinding-coarse and fine separation-magnetic-gravity-anion reverse flotation process

This kind of process is to use strong magnetic separation to pre-throw the tail after finishing the coarse-grained separation, and then carry out the gravity separation-reverse flotation operation. The pre-throwing amount of the strong magnetic field can generally be above 45%, which greatly reduces the amount of ore in the follow-up operation and saves the follow-up sorting equipment. At the same time, after high-intensity magnetic pre-throwing, the ore entering the subsequent high-intensity magnetic operation has a higher grade, which is beneficial to the gravity separation operation to improve the concentrate grade.