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Click to add WeChatIn nature, more than 300 kinds of iron-containing minerals have been discovered. They are classified according to their chemical components and can be divided into magnetite, hematite, limonite, siderite, and chromite. Etc., if classified according to its magnetization coefficient, it is mainly divided into two categories: strong magnetic iron ore and weak magnetic iron ore. Below we will introduce the two types of magnetite beneficiation processes.
Highly magnetic iron ore can generally be divided into Single magnetite ore and strong magnetite containing multiple metals.
Most of the iron component in this type of iron ore is magnetite. Its ore has a simple composition, strong magnetism, and is easy to grind. Weak magnetic separation method is often used in mineral processing to obtain ideal magnetite concentrate. When the grinding particle size is greater than 0.2mm, most iron ore magnetic separation plants usually use one stage of grinding-magnetic separation. When the grinding particle size is less than 0.2mm, they use two stages of grinding-magnetic separation.
If qualified tailings are separated in the coarse grinding stage, the iron ore magnetic separation plant should adopt the stage grinding-magnetic separation process. For dry and water-scarce areas, iron ore concentrators may consider adopting dry grinding-dry magnetic separation process.
In this type of iron ore, magnetite is the main mineral, and other gangue minerals such as silicate and carbonate minerals are also included. , cobalt pyrite, chalcopyrite or apatite, etc. Therefore, in the mineral processing process, the weak magnetic separation-flotation combined process is often used, that is, the weak magnetic separation process is used to first recover iron. , and then use the flotation process to recover sulfide or apatite, which is conducive to obtaining higher mineral processing indicators.
Usually, the combined process of weak magnetic separation and flotation is also divided into two types: weak magnetic separation-flotation and flotation-weak magnetic separation. The difference between the two processes lies in the fate of the conjoined magnetite and sulfide.
Weak magnetic separation-flotation process flow:The continuous body mainly enters the iron concentrate;
Floatation-weak magnetic separation process flow:The conjoined components enter the sulfide concentrate.
This shows that under the same grinding particle size, the combined process of first flotation and then magnetic separation can obtain iron concentrate with low sulfide content and sulfide concentrate with high recovery rate.
This type of ore is similar to strong magnet ore. According to the properties of the ore, it is also divided into single weak magnetic iron ore and weak magnetic iron ore containing multiple metals. Magnetic iron ore.
This type of weakly magnetic iron ore has multiple ore types, mainly including hematite, siderite, and limonite. etc. Since this type of minerals involves many types and has a wide range of embedded particle sizes, the beneficiation method is also more complicated. Gravity separation, flotation, strong magnetic separation or their combined processes are often used.
Flotation process: The flotation process is mainly used to separate fine-grained and particulate weakly magnetic iron ores, including forward flotation and reverse flotation. Among them, the forward flotation process is suitable for quartz hematite ore that does not contain easily floating gangue; the reverse flotation process is suitable for ores with easily floating gangue.
Gravity separation process: Mainly used to separate coarse particles (2mm-20mm), Medium-grained weakly magnetic iron ore. Among them, coarse-grained and extremely coarse-grained (larger than 20mm) ores are commonly used heavy media or jigging gravity separation process; medium-grained iron ore uses shaking table< /strong>Flowed film gravity separation processes such as spiral chute and centrifugal concentrator.
Magnetic separation process:It is also suitable for selecting coarse particles (2mm-20mm) and medium particles with weak magnetic properties. iron ore. Among them, dry induction roller type strong magnetic separator is often used in the strong magnetic separation process of coarse and medium-grained ores. However, since the high-grade magnetic separation concentrate of most weakly magnetic iron ores is not high, and the processing capacity of the gravity separation process unit is low, a combined strong magnetic separation-gravity separation process is often used, that is, the strong magnetic separation process is first used to discard a large amount of qualified products. Tailings, and then use the gravity separation process to further process the strong magnetic concentrate to improve the concentrate grade.
This type of ore refers to phosphorus-containing hematite ore and siderite, which has weak magnetism and There are phosphorus-containing substances, so in the mineral processing plant, gravity separation, flotation, strong magnetic separation or combined processes are generally used to recover iron minerals, and then the flotation process is used to recover phosphorus or sulfide.
The above is a classification of strongly magnetic and weakly magnetic iron minerals, and an introduction to their beneficiation processes Method, it is not difficult to see from the article that due to the numerous and complex types of ores, in the mineral processing process, a combination of multiple mineral processing processes is generally used to improve the mineral processing indicators. Therefore, blind selection cannot be made. It is recommended to conduct mineral processing tests and pass the tests. Analyze and design suitable mineral processing technology process, and customize reasonable mineral processing equipment.
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