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Magnetite is widely distributed in nature and is often found together with hematite and manganese ore. It has strong magnetic selectivity and is one of the main ores of iron ore, so it can be used to smelt iron and steel. As an important ore, magnetite also has important value in the metallurgical industry and other fields. Commonly used magnetite ore processing methods mainly include: single magnetic separation process, weak magnetic separation-cation reverse flotation process, weak magnetic separation-anion reverse flotation process, full magnetic separation process and ultra-fine crushing-wet magnetic separation tailing process. The following will introduce you to the magnetite ore processing methods based on these methods.
(Magnetic separation equipment)
Use the table of contents below to navigate through the guide:
Magnetite beneficiation is the main part of iron ore beneficiation work, and it is mainly a sedimentary metamorphic magnetite. The magnetite present in the ore is basically fine-grained, and the gangue minerals mainly include quartz, amphibole and other silicate minerals. As a strong magnetic mineral, magnetite can generally be processed using a weak magnetic separation process to obtain concentrates with high grade and high recovery rate. According to the different grinding particle size of the ore, one-stage magnetic separation process or two-stage magnetic separation process can be selected. The one-stage magnetic separation process is generally used for ores with a grinding particle size of 0.2-0.3mm or above. If the ore grinding particle size is less than 0.2-0.3mm, a two-stage magnetic separation process can be selected.
The combination of weak magnetic separation and reverse flotation technology can realize the complementary advantages in the magnetite separation process and improve the concentrate quality in the magnetite separation process. According to different chemical systems and collector types, the reverse flotation process can be divided into cationic reverse flotation and anionic reverse flotation. When cationic reverse flotation is used, starch is mainly used as an inhibitor of magnetite, and amines such as dodecylamine can be used as collectors of magnetite. Using such a pharmaceutical system, the system is simple, the temperature of the slurry is not high, and the slurry is neutral.
Compared with the cationic reverse flotation process, anionic reverse flotation has the advantages of non-sticky flotation foam, relatively stable flotation indicators and no corrosion to rubber. However, the anion reverse flotation process requires the addition of a variety of chemicals and requires high slurry temperature. When the slurry is alkaline, it is beneficial to the transportation of concentrate pipelines. After reverse flotation, the gold ore can be directly filtered, and acid needs to be added for treatment before filtration.
The full magnetic separation process mainly relies on the combination of new magnetic separation equipment to achieve effective separation of magnetite. Commonly used magnetic separation equipment mainly includes magnetic separation columns, high-frequency vibrating fine screens, magnetic field screening machines, etc. When these equipment are combined with traditional weak magnetic mineral separation equipment, the magnetic separation effect can be further improved. Compared with the reverse flotation process, the full magnetic separation process has simple process, reliable process, low investment cost, and short construction period.
(Magnetic separation site)
When using this process, the magnetite needs to be finely crushed to 5mm or less. Then a permanent magnet field intensity magnetic separator is used for wet magnetic separation and tailing removal. Using this process can save energy and reduce emissions to a certain extent, while also improving the utilization rate of lean iron ore and the quality of iron concentrate products.
The above contents are five magnetite ore processing methods. As one of the important iron ores, magnetite should be treated with a suitable beneficiation plan, which requires careful study of the properties and characteristics of the ore. According to the beneficaition test results, formulating a reasonable mineral processing process and configuring equipment can improve the utilization rate of magnetite resources and the quality of the concentrate. Therefore, Xinhai Mining recommends conducting mineral processing test analysis to determine the characteristics of magnetite, select efficient equipment and processes, and improve the economic benefits of mineral processing.