The zircon beneficiation process is a process to remove impurities and increase the content of zirconium ore. According to the characteristics of the original ore, the methods of gravity separation, magnetic separation, and electric separation are generally adopted.
Zirconium deposits can be divided into veins and placers according to their genesis. Zircon deposits with industrial mining value are mainly placer deposits. There are alluvial placer, residual placer, and coastal placer, among which coastal placer has industrial mining value. The formation of these placer deposits determines the type of ore.
Method:Gravity separation, magnetic separation and electrostatic separation are often used. Because there are many associated minerals in zircon sand, gravity separation, magnetic separation and electric separation are required
Magnetic separation : Magnetic minerals in heavy minerals include ilmenite, hematite, chromite, garnet, biotite, monazite, etc. Zircon is a non-magnetic mineral or a weakly magnetic mineral (the iron in zircon in some deposits is weakly magnetic). There are two types of magnetic separation: dry and wet. Dry magnetic separation requires the selected materials to be heated, dried, and classified before they can be sorted. The wet-type strong magnetic field magnetic separator has a wide separation particle size, and the lower limit of the particle size can reach 20um. Therefore, it is more appropriate to use a wet magnetic separator when the zircon particle size is fine.
Gravity separation:Zirconium is mostly found in ilmenite, and is often accompanied by heavy minerals such as hematite, chromite and garnet. Therefore, in the initial stage of enriched zircon, gravity separation is often used, such as separating heavy minerals from gangue (quartz, feldspar, biotite), etc. with a shaking table, and then using other beneficiation methods to separate them from other heavy minerals. .
Electric separation: Use the difference in mineral conductivity to separate conductive minerals such as ilmenite, hematite, chromite, cassiterite, and rutile from non-conductive minerals such as zircon, monazite, garnet, and apatite. Desliming, grading, drying and dosing should be done before electric selection.
Zirconium ore beneficiation plant are often divided into two parts: wet treatment and dry treatment.
In the wet treatment stage of raw ore, gravity separation equipment such as cone concentrator, spiral concentrator, shaking table or jig are used to remove gangue minerals such as quartz, feldspar and mica
The obtained heavy minerals (coarse concentrate) are selected through 2 to 4 stages to further remove the remaining light minerals, and then are concentrated, dehydrated, dried, cooled and then sent to the dry treatment stage for further separation. The dry treatment section is generally composed of weak magnetic separation, strong magnetic separation and electrostatic separation.
Its purpose is to comprehensively recover minerals such as magnetite, ilmenite, rutile and monazite that are symbiotic with zircon. According to the difference of mineral magnetic and electrical conductivity, magnetite can be recovered by weak magnetic separation; ilmenite, garnet, etc. can be recovered by strong magnetic separation; finally, monazite, rutile and zircon are separated by a high-voltage electrostatic concentrator.
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