Introduction to 3 iron ore desulfurization processes

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Although my country is rich in iron ore resources, most of them are poor and fine iron ores, and the iron ore contains high levels of harmful substances such as sulfur, phosphorus and silica. When sorting, it is more difficult to obtain high-quality iron ore concentrates. Difficulty, especially for iron minerals with high sulfur content, is even more difficult to use conventional mineral processing methods. Currently, there are three methods for beneficiation of high-sulfur iron ores. Let’s take a look at them below.

1. Stage grinding-stage separation, desulfurization and iron beneficiation process

When iron ore is beneficiated, its grinding fineness has a great influence on the beneficiation index. The difference in grinding particle size It will affect the degree of monomer dissociation, thereby affecting the mineral processing indicators, especially fine-grained pyrite-containing iron ore, which requires fine grinding to achieve monomer dissociation of the mineral. Therefore, for this type of sulfur-containing (pyrite and magnetic yellow) For a single iron mineral (iron ore), using the stage grinding-stage separation process can obtain better separation indicators.

For example: in a certain magnetite, sulfur exists in the form of pyrite, this process is used process, the final magnetite concentrate grade reached 65.2%, and the recovery rate reached 81.3%.

2. Magnetic separation-flotation combined desulfurization and iron separation process

The magnetite currently available in my country has the characteristics of fine particle size and the presence of sulfur-containing pyrite, making Magnetic agglomeration has a negative impact on separation. If a single magnetic separation process cannot effectively obtain high-grade magnetite concentrate, the magnetic separation method and the flotation method can be combined to achieve complementarity between the two parties in the process and effectively improve the efficiency of the process. The grade of iron ore concentrate.

For example: In a certain high-sulfur magnet ore, sulfur exists in the form of pyrrhotite and pyrite, using The combined process of magnetic separation and anion reverse flotation was finally obtained under the conditions of 5.71% sulfur and 31.52% iron. The iron concentrate contained 66.27% iron and 0.171% sulfur, and the iron recovery rate reached 81.7%. .

3. Roasting-magnetic separation-flotation combined desulfurization process

At present, the reduction roasting magnetic separation process of domestic iron ore is due to factors such as high cost and low grade of iron concentrate. , is only suitable for sorting iron ores with large burning losses such as limonite and siderite, while weakly magnetically separated iron ores containing various types of sulfur can be desulfurized through the roasting-magnetic separation-flotation combined desulfurization process. , can obtain better iron concentrate.

For example: a certain iron ore raw ore contains high sulfur content, especially the pyrrhotite content, which causes magnetism. The sulfur content in the ore concentrate exceeds the standard. Therefore, a combined roasting-magnetic separation-flotation process is used. During flotation, an enhanced flotation method is used, the dosage of rhubarb is increased, and a composite activator is added to reduce the sulfur content in the iron concentrate from 0.8 % dropped to 0.4%, finally reaching the salable requirement.

The above is an introduction to the three process methods for removing sulfur from pyrite. In the actual mineral processing plant, each type of iron ore contains different sulfur content and the sulfur content is also different. Therefore, when selecting the process, it is necessary to First conduct ore dressing test analysis, and design a suitable iron ore sulfur removal plan through analysis. According to the plan, a suitable Pyrite mineral processing equipment.