Sorting of ore
Tin ore sorting ore generally used multi-stage sorting process multistage grinding, since tin brittle, easily crushed than the other through the associated minerals. The general number of segments is two to four segments.
From the point of view of the washing process, if it is necessary to remove the sulfide, there is a problem of first desulfurization or post-desulfurization, one desulfurization or multiple desulfurization, which are determined according to the nature of the ore. In the tin-selecting system itself, according to our experience, a sub-sugar mine is produced in the shaker concentrate and mine, and it is concentrated and treated, which is called “concentrated washing of secondary concentrateâ€. In addition to some of the monomeric cassiterite, the secondary concentrate is mostly iron- tin combined with a coarse particle size. This part of the material is used in the re-washing process, separated from the main process, separately ground, and separately selected. The result of this method not only avoids the mixing of this high-iron material into the general middle ore, but also affects the separation of the medium ore. On the other hand, it also improves the separation efficiency of the secondary concentrate.
The equipment for mineral sand selection mainly includes jigs and shakers, and some use various types of chutes.
Another major problem with the ore sorting system is how to reduce the excessive crushing of the cassiterite. The key to solving the problem is to try to make the cassiterite that has become a monomer no longer re-grinding. The multi-stage grinding used before, the multi-stage sorting and the use of fine screen as the closed circuit equipment for grinding are all feasible solutions.
The classification of grades is also a successful experience in tin dressing in China.
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