100TPH Alluvial Tin and Rock Tin Processing Plant

Tin is a silvery-white metal with a strong luster, a relative density of 7.0, a low melting point (230 ℃), hardness of 3.75, soft and good ductility. The content of tin in the earth’s crust is only 2 × 10-6～3 × 10-6. Tin belongs to the cuprophilic element group, but it has the amphoteric characteristics of oxygen and sulfur in the upper lithosphere. Tin reacts with sulfur to form two compounds: Tin disulfide and tin disulfide, which are highly volatile at high temperatures. Tin can also combine with oxygen to produce tin oxide and tin dioxide. Although tin has divalent and tetravalent valence states, tetravalent compounds are relatively stable under natural conditions, especially tin oxide (SnO2), which is one of the most stable compounds in the earth’s crust.

There are more than 50 kinds of tin-containing minerals known in nature, and about 20 kinds of main Tin Minerals. Cassiterite is mainly of economic significance, followed by yellow tin ore. In some deposits, pyrite, antimony tin lead ore, cylindrical tin ore, sometimes black sulfur silver tin ore, black boron tin ore, Malayan stone, cassiterite, and magnesium tin ore can also be relatively enriched to form industrial value.

Flowchart Explanation

1. The raw ore feed into the trommel screen for washing a few little clays, and can separate the gravel or stone which needs to crush&grind to get the inside tin, the separated gravel can transfer to the next jaw crusher by the belt conveyor. After the jaw crusher, goes to a cone crusher for second crushing. The output from the cone crusher goes to a vibrating screen for sieving. The overscreen size back to cone crusher for crushing again.
2. The under-screen particles will go to the ball mill for grinding. There is one hopper for transferring and buffering materials before being fed into the ball mill. Under the hopper, there is an Electromagnetic vibration feeder for feeding the material more evenly.  Ball mill and spiral combination circulating closed-circuit system, which can make sure the final output meets less than 200mesh (0.074mm) The small fine particles from the spiral classifier will transport to first stage spiral chute separator by a slurry pump. The middlings from the first stage spirals separator will go to the second stage spirals separator.  All the concentrates from the spiral separators will transport to two drums magnetic separators to separate the iron/Fe material( Like magnetite, hematite).
3. After separating the Iron first, the others mineral-like tin (which do not contain the magnetism) will go to a two-stage shaking table for Tin separation. The middlings from the first stage shaking table will go to the second stage shaking table for beneficiation again to improve the recovery rate. The shaking table quantities can adjust based on your mine situation and requirements.
4. The under-screen from the first trommel screen machine will go to the jig machine. The jig screen meshes with a 2mm aperture. The concentrates from the jig machine go to two drums magnetic separator separate the iron/Fe material first. After removing the iron, then goes to the shaking table for Tin separation. The middlings from the first stage shaking table will go to the second stage shaking table for beneficiation again to improve the recovery rate.
5. All the final tin concentrates from the second stage shaking table will go to the dryer machine for drying.
6. All the tailings from the jig machine, spiral chute separator, and shaking tables will go to a dewatering screen via a slurry pump for dewatering. After precipitation, the water can be recycled.
7. The overscreen waste can transport away by belt conveyor.