General beneficiation method of tin ore - gravity separation

By -

 The density of cassiterite (SnO2) is 6800~7000 kg/m3, and it is often symbiotic with gangue minerals (such as quartz, feldspar, muscovite, etc.) with a density of about 3000 kg/m3.

180.jpg

Gravity beneficiation is the basic method of cassiterite separation. More than 85% of the world's tin concentrates come from gravity beneficiation operations. Gravity beneficiation can be used as cassiterite pre-enrichment means, and can also directly produce qualified cassiterite concentrate. In the Bronze Age, people began to use gravity beneficiation to enrich tin minerals. Since the 1960s, tin beneficiation has developed from a single gravity beneficiation to a combined process consisting of gravity beneficiation, flotation, magnetic separation, and electrical separation.

Grading desliming is a necessary preparation for the cassiterite gravity beneficiation process. The desliming equipment used mainly includes water guns, various washing machines, Bartley-Maudsley turning beds, cross-flow belt chutes and hydrocyclones. Medium concentrators and jigs mostly use dry coarse-grained and medium-grained cassiterite for pre-selection; screw concentrators use dry to effectively recover cassiterite with a particle size of 0.074~1 mm. The enrichment ratio of the shaker separation is high, which can not only select high-grade cassiterite concentrate, but also throw out the final tailings, which is the main equipment of the tin processing plant. Centrifugal concentrators are used to sort tin slime with a dry size of 0.037 mm.

Tin ore is divided into sand tin ore and vein tin ore. Sand tin ore is the main mining object, accounting for about 75% of the total mining volume. Sand tin ore generally adopts the gravity beneficiation process of stage grinding, stage separation, mud sand separation, and rich and poor separation. Vein tin ore has cassiterite-oxide mineral type, cassiterite-quartz type and cassiterite-sulfide mineral type.

181.jpg

The cassiterite-oxide mineral type mainly adopts a single gravity beneficiation process, mainly using a shaking table, and multi-grinding and multi-separation operations. Cassiterite-quartz type and cassiterite-sulfide mineral type are generally pre-selected by rich separation or heavy media separation, rough separation by jig and shaker, and finally by flotation, gravity beneficiation, magnetic separation, and electric separation. The process is selected to produce the final concentrate.

After the raw ore is ground to less than 1.5 mm in one stage, the middle 500 mm and middle 250 m hydrocyclones are used for two-stage classification, and the particles larger than 74 microns and 37~74 microns are still sorted and classified in a flat field shaker. After mixing with the secondary ore, Baiping uses a @125 high-meter hydraulic flow applicator to carry out late sludge, and discards the fine 19-micron or 1000-micron fine ore sludge with a very low tin content. Centrifugal concentrator, belt chute, shaker for sand settling.


Comments

Post a Comment

Popular posts from this blog

Selection of spodumene flotation reagents

By -
Image
At present, the  beneficiation methods of spodumene  mainly include: manual separation, thermal disintegration, magnetic separation, resuspension method,  flotation method  and combined beneficiation method. Among them, the flotation method of spodumene is the most studied in the laboratory and the most widely used mineral processing method in industry. 1. Cationic collectors The cationic collectors used in the flotation of spodumene ore are mainly amine collectors, which flotate gangue minerals such as quartz, feldspar and mica under acidic conditions, and leave the spodumene at the bottom of the tank. This method is often used in the roughing of spodumene, and cannot directly obtain spodumene concentrate with higher purity, and needs to be used in conjunction with other sorting methods. In production practice, Yan Gengsheng used  the process of flotation of spodumene  with mixed soap and diesel oil under alkaline conditions after flotation of mica with phylloylamine under acidic cond
Read more

How to use inclined plate thickener for tailings dry discharge

By -
Image
 Tailings treatment is an important part of mine production. Concentration in dry tailings discharge is an important link in achieving dry stacking. It not only directly affects the processing capacity of filter equipment, but also affects the resistance of filter cakes. The particle is resistive to the filter cake, so according to the characteristics of iron tailings, there is a new type of thickener . The flow of tailings slurry in the thickener is ideally slow. As soon as the solid particles leave the flow layer, they will be considered as sediment. This model is also called shallow sedimentation. The sedimentation occurs in the void between the inclined plates. Within the cavity, but due to the small spacing between the inclined plates, it creates favorable conditions for the formation of laminar flow. The clarified overflow water moves upward along the inclined plate space, and the solid particles settle between the two plates, and only need to settle to a small distance to fall o
Read more

A new type of coarse particle flotation machine for rough grinding and flotation in mines

By -
 Coarse ore flotation has always been one of the key technologies for mine coarse grinding and flotation to reduce energy consumption. An iron ore plant in Anhui Province has a very small content of mica in the iron ore of the first grinding product. Recovery value. However, there are generally two ways to recover mica at present: one is coarse-grained regrind and reselection; the other is to choose equipment suitable for coarse-grained mineral flotation. However, during the inspection of the production site, it was found that many of the mica minerals in the second-stage grinding products in this iron ore did not meet the particle size requirements of flotation, and the density of mica was small, and most of them showed flaky structure. The overflow of the cyclone ran out, causing the inspection and screening operation to be blocked first, so regrinding is not suitable for the recovery of coarse mica.     The design principle of coarse-grained flotation machine is that coarse-grained
Read more