In the nature, the tin ore are existing in sand or alluvial raw material, this kind tin ore called sand tin or alluvial tin, the raw material may be with stone,sand,gravel,soil,sticky clay,some times with other magnetic iron , tungsten, ilmenite, hematite, monazite, zircon sand and other minerals.
The other type tin ore is hard rock tin ore, the tin is existing in hard rock, such as normal stone, quartz vein above the land.The rock tin ore is mostly like to be with tungsten ore together.
How to process Rock Tin ore?
In general, the rock tin ore processing machine of heavy selection are generally used, and the ore dressing of tin ore with high degree of dissociation of the monomer is basically the same as the ore dressing of gold ore, and the better ore dressing index can Be obtained by simple screening.
For ore processing of tin ore with low dissociation degree, it is often necessary to break the secondary structure by bar grinding and other processes, so as to improve the recovery rate and concentrate grade.
The basis of the gravitational separation of sand tin ore processing machine is also the principle of gravity separation. According to the specific gravity difference between tin ore and waste stone, the proportion of the proportion of tin and waste stone in the tin deposit is very good And the beneficiation effect can be obtained by the method and equipment of heavy separation in tin ore processing plant.
At the same time, the advanced tin ore processing plant has the advantages of high efficiency, energy saving, environmental protection and so on, the investment of equipment is small, and the operating cost is low. It is an ideal choice for the beneficiation of Sands.
The equipment for gravity separation of sand tin ore is mainly jig. Sometimes, the rocking bed is also used to improve the recovery rate of fine grained tin ore. The technological process of gravity separation for sand tin ore is screening, jigging and dewatering. The sand tin ore with a low degree of dissociation, two reelection processes are often needed: screen jig, rod mill, jigging and dewatering.
What are the beneficiation methods of tin ore?
Ore dressing of tin ore generally adopts gravity separation method, which is determined by the density of tin ore than the characteristics of paragenetic minerals. However, iron oxides such as magnetite and hematite are often associated with tin ores, so gravity separation is not possible. Therefore, magnetic separation and flotation methods will be used in tin ore dressing.
Tin ore beneficiation process flow
1. Ore washing and desliming.
This step is aimed at the raw materials with high mud content and strong cementation. Such raw materials must be washed and desliming before crushing. The mine washing machine is used for washing the ore, and the classifier is used for the desliming and the hydrocyclone.
2. Crushing and screening
Using the jaw crusher and hammer crusher, the ore is broken into ore with a particle size below 20mm. Then the vibrating screen is divided into two particle sizes, 0-4mm and 4-20mm.
After crushing and sieving, the ore of 4-20mm should be pre-processed by using heavy medium cyclone, and then into a grinding section. After grinding, jigs and vibrating screens are used for further separation. The screen is controlled at 2mm, – 2mm and then the concentrate is selected by shaking table, +2mm becomes tailings.
Flotation stage is divided into two steps: mixed flotation and separation flotation. Firstly, the concentrates selected by jig and shaking table are mixed flotation, then the concentrates are separated by lead and zinc flotation, and the tailings are separated by shaking table.
5. Gravity Separation
Slime enters the 300mm cyclone, then overflows through 125mm and 75mm hydrocyclones to remove fine mud, and then the sediment is concentrated and desulfurized by flotation and cassiterite flotation.
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