The role of heavy mediating in mineral separation
Re-selection can be used for the pre-selection and selection of minerals. The main advantages of heavy media selection are high efficiency, large capacity, and low processing cost per ton of material. Moreover, materials that are difficult to handle by other methods can also be effectively sorted. As a preselection device, re-selection is the only method capable of sorting with a density difference of 0.1 g · ml (that is, the density difference between useful and useless components).
The appearance of the heavy-medium cyclone not only improves the separation effect, but also the lower limit of the particle size of the selected material can reach 0.5 ar The heavy-medium cyclone can also handle finely-inserted feed minerals, and the range of use can be extended to materials that were previously considered unpreparable. In the coal industry, an autogenous heavy media system (mineral fines as a sorting medium) has been developed for recovering the fine-grained feed with a lower limit of 0.1 ram. In the coal preparation industry, Sri Lanka has developed a particle size heavy media cyclone (LA RCODEM S) with a diameter of 1.2m and a feed particle size of 10-0. 5mm, which solves the problem that coarse and fine coal must be treated separately. , Which simplifies the process. Several types of cyclones in use There are two main types of cyclones used for heavy media selection. One type is a standard cyclone, such as the DSM cyclone in the Netherlands. The structure differs from ordinary graded cyclones mainly in the structural strength and the diameter ratio of the cyclone, which is large, especially in the treatment of large pieces When feeding. This is mainly reflected in the diameter of the inlet and the bottom flow port, and the designed input jitter size is at least 25arm. The other type is a cylindrical cyclone, including DWP, Tri, Flo and Larodems. The cyclone diameter is large in structural strength and underflow diameter.