Zircon beneficiation is the process of removing impurities from zircon ore and increasing the zircon content. Zircon (also known as zircon) is zirconium orthosilicate, and its chemical formula is ZrSiO4, which is the most common type of zirconium-containing minerals. Most of the zircon deposits are seashore sand mines. Heavy sand-containing zircon usually symbiotic magnet ore, iron titanium, rutile, monazite and other heavy minerals. Generally, when zircon is selected, these heavy minerals are also recovered as target minerals.
Zircon is mainly used as a raw material for zirconate refractory bricks, and can also be used for precision casting sand and ceramic tools.
The main producers of zircon in the world are Australia, the United States, and Brazil. Chinese zircon is mainly produced in Guangdong, Hainan and other provinces.
Mineral processing method:
Reselection, magnetic separation, electrostatic selection and flotation are often used.
Forming multiple zircon reselection in the presence of ilmenite, and frequently with hematite, chromium and iron garnet and other heavy minerals. Therefore, the enrichment of zircon is often used in the initial stage of re-election, such as the separation of heavy minerals from gangue ( quartz , feldspar , biotite ) by a shaker, and then separated from other heavy minerals by other mineral processing methods. .
Flotation commonly used collectors are fatty acids (oleic acid, sodium oleate); pulp adjuster is sodium carbonate; inhibitor is sodium silicate; activator is sodium sulfide and heavy metal salts (zirconium chloride, ferric chloride) ). It is also useful to adjust the slurry to acidity with oxalic acid and to float with an amine collector.
It is selected from electrically conductive differences using the mineral ilmenite, hematite, chromite, cassiterite, minerals such as rutile conductive nonconductive mineral zircon, monazite, garnet, apatite and the like separated. Prior to electrification, pre-de-sludge classification, drying and dosing should be carried out.
Magnetic separation The minerals in heavy minerals are ilmenite, hematite, chromite, garnet, biotite, and monazite. Zircon is a non-magnetic mineral or a weak magnetic mineral (the iron in the zircon in some deposits is weakly magnetic). Magnetic separation is divided into dry and wet. Dry magnetic separation requires heating and drying of the selected materials, and pretreatment after classification and other conditions can be carried out. The wet strong magnetic field magnetic separator has a wide particle size and a lower particle size limit of 20um. Therefore, when the zircon grain size is fine, a wet magnetic separator is preferred.
Because there are many associated minerals in zircon ore, it needs to be combined by re-election, magnetic separation, flotation, and electric selection.
Zircon concentrators are often divided into wet and dry processes. The ore is first removed from the gangue minerals such as quartz, feldspar and mica by a re-election equipment such as a conical concentrator, a spiral concentrator, a shaker or a jig in the wet treatment stage. The obtained heavy minerals (coarse concentrate) are further separated from the remaining light minerals after 2 to 4 stages of selection, and then concentrated, dehydrated, dried, cooled, and sent to a dry processing section for further sorting. The dry processing section is generally composed of weak magnetic separation, strong magnetic separation, and electrostatic selection. 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 magnetism and conductivity, magnetite can be recovered by weak magnetic separation; ilmenite and garnet can be recovered by strong magnetic separation; finally, monazite, rutile and zircon are separated by high-voltage electrostatic concentrator.
The factory is divided into two parts: wet selection plant and dry selection plant. The wet selection plant is located on the floating vessel. The raw ore is first sieved to remove the waste rock, and then dehydrated, de-sludged by a hydrocyclone, and fed into a conical concentrator for rough selection.
Since the useful minerals in the rough concentrate are mainly ilmenite, when entering the selected section, the ilmenite is first selected by a dry magnetic separator. After the titanium is selected, the material is sorted by a spiral concentrator to further discharge the light minerals. After drying, electroporation, magnetic separation and re-election are carried out to select monazite, zircon, ilmenite and the like.
Construction Hoist Safety Device
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Safety device board is the connected part between safety device and other structures, it can take the impact of stopping the cage. There are installed lower speed switch, upper travel limit switch and final limit switch, once the switchs touch the relevant cam the cage will act.
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