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In this post you'll see different extration processes used when the magnetism of iron ore various.
Besides, you can also see:
Extraction of single strong magnetic iron ore
Extraction of polymetallic strong magnetic iron ore
Extraction of single weak magnetic iron ore
Extraction of polymetallic weak magnetic iron ore
Let's dive right in !
According to the classification of the chemical composition, the iron ore can be divided into magnetite, hematite, limonite and siderite. According to the specific magnetization coefficient, the iron ores can be divided into strong magnetic minerals and weak magnetic minerals, which provides a basis for the process of the extraction of iron ore.
The iron mineral in the single magnetic iron ore is mostly magnetite. Because the magnetite ore has simple composition,strong magnetism and easy to separate, so the weak magnetic separation process is often used to deal with single magnetic iron ore.
Usually, the polymetallic magnetic iron ore often contains cobalt silicate, carbonate minerals, pyrite, chalcopyrite and apatite. It is recommended to adopt weak magnetic separation - froth flotation process to the extraction of iron ore, namely recycling the iron by the weak magnetic separation process, then recycling the sulfide or apatite through the froth flotation process.
Generally, the weak magnetic separation – froth flotation joint process is also divided into two types: weak magnetic separation – froth flotation process and froth flotation – weak magnetic separation process. The difference between the above processes of the extraction of iron ore is that the coenobium direction between the magnetite and the sulfide is different.
• For the weak magnetic separation – froth flotation process, the coenobium mainly enters iron concentrate.
• For the froth flotation– weak magnetic separation process, flotation – weak magnetic separation process mainly enters sulfide concentrate.
Single weak magnetic iron ores mainly include hematite, siderite, limonite and hematite (vitrinite) – siderite, etc.Due to its various kinds and the wide range of disseminated grain size, the extraction of weak magnetic iron ore is also relatively complex, such as gravity separation process, froth flotation process, strong magnetic separation processor combined process.
Froth flotation process is mainly adopted to the extraction of weak magnetic iron ore with fine particles, including positive flotation and reverse flotation process. Among them, the positive flotation process is suitable for the quartz hematite without easily floating gangue, while the reverse flotation process is suitable for the extraction of iron ore with easy-to-float gangue ore.
Gravity separation process and the strong magnetic separation process are mainly adopted to the extraction of weak magnetic iron ores with coarse (2mm - 20mm) and medium particles.
• Heavy media separation and jigging process are often used to deal with the extraction of weak magnetic iron ores with coarse and extra coarse (> 20mm) particles;
• Shaking table, spiral chute and centrifugal concentrator are usually used to the extraction of weak magnetic iron ores with medium particles.
• Dry induction roller type strong magnetic separator is used to the extraction of weak magnetic iron ores with coarse and medium particles.
However, the concentrate grade of most weak magnetic iron ores is not high after the low strong magnetic separation process, and the unit processing capacity of the gravity separation process is low, so the combined process of strong magnetic separation and gravity separation is often adopted to the extraction of iron ore, that is, a large number of unqualified tailings are discarded by the strong magnetic separation process firstly, and then the gravity separation process is used to further treat the strong magnetic concentrate for improving the concentrate grade.
Polymetallic weak magnetic iron ore refers to the phosphorous hematite, siderite. Most mineral processing plants adopt gravity separation – froth flotation – strong magnetic separation process or a combining process to the extraction of iron ore, and then use the flotation process to recover phosphorus or sulfide.
It is not difficult to see that, due to the various kinds and complex nature,most iron ore dressing plants adopt multiple process for the extraction of iron ore to obtain the ideal ore processing indicators. It is suggested that the owners must do a good job in the mineral processing test, and rationally choose the appropriate process for the extraction of iron ore according to the final results of the mineral processing test report.