In the early 1980s for the first time successfully used for rare metal tantalum and niobium mineral processing, in the 1990s on the basis of continuous improvement, developed φ400mm (double-headed), φ600mm (double-headed), φ940mm (double-headed), φ1200mm (three), the wedge A series of coarse sand or fine mud type equipment for beading or grooved groove surface. Such equipment has large processing capacity, high enrichment ratio, simple structure, small floor space, convenient installation and operation, strong adaptability, can be selected without classification or wide selection, stable selection process, easy to manage, etc. rotating spiral chute it is widely used in tantalum and niobium, tungsten, tin, gold, titanium, iron ore, sorting the like beach placer. Especially for the breakthrough of fine mud dressing, the rotating spiral chute has become an effective equipment for the secondary resource utilization of fine mud difficult ore and tungsten tin tailings.
Selection characteristics research
The rotary spiral chute (referred to as the rotary snail) combines the selection mechanism of spiral chute, shaker, centrifugal beneficiation, etc. The ore particles are sorted by the difference of the combined force fields such as fluid dynamics, centrifugal force, friction force and gravity on the groove surface.
The ore flow enters the trough surface in a strong turbulent state. The turbulent diffusion causes the ore particles to settle according to the specific gravity. With the lateral circulation movement between the inner and outer edges of the spiral groove, the upper layer water flow and the light mineral move to the outer edge. The secondary circulation in the outer edge region is stronger than the inner edge region, and the heavy mineral attached to the bottom of the groove is preferably concentrated on the inner edge.
In addition, the longitudinal movement of the ore along the trough promotes loose and stratified ore. The ore and light minerals suspended in the upper layer have a large longitudinal velocity, and the centrifugal force field acts to squeeze the outer edge, but The heavy mineral at the bottom layer is subjected to frictional resistance, the longitudinal movement speed is low, the centrifugal force is small and is concentrated on the inner edge, and the light and heavy minerals are on the chute surface, and the lateral zoning is clear and easy to intercept with the longitudinal development.
The groove section is arranged with a groove or a wedge in the radial direction of 60°, and the groove or wedge strip is gradually reduced to the tip-out from the outer edge zone to the inner edge zone to improve fluid movement and increase the heavy mineral concentration of the groove bottom. The edge vortex zone is presented (Kunming crusher professional manufacturer Kunding Heavy Machinery Factory provides you with a full range of mineral processing equipment including spiral chute and crusher). Approximate interference settlement or delamination, close to the bottom of the tank heavy minerals, especially fine particles Heavy minerals are subjected to mechanical resistance and secondary circulation, moving along the groove or the strip to the inner edge, thereby increasing the recovery of fines and heavy minerals. In order to improve the quality of the concentrate, a constant-pressure constant-flush water spiral water tank is arranged in the axial direction at the upper end of the chute. The flushing water rotates along the slot and the equipment rotates. The inertial centrifugal force increases from top to bottom, effectively rinsing the inner edge concentrate zone. Increase the enrichment ratio of mineral processing.
The special groove or wedge of the screw snail widens the selected grain size, avoiding the requirement of strict classification of equipment such as shaker and centrifuge. In the composite force field, the minerals with different specific gravity or different grain size are significantly different, strengthen the sorting process, improve the sorting efficiency, reduce the lower limit of mineral particle recovery, and recover more than 20% for the -0.032mm particle size. Dropped to 0.019mm, breaking the conclusion that the spiral chute can only recover the grain size of 0.037mm or more, and the combination of coarse and fine mud is selected, and the efficiency in the rough sweeping process is particularly outstanding. A certain mine grinding ~-lmm for comparative test, the results are shown in Table 1 (this data is φ940mm rotary snail dressing test and practice).
It can be seen that the special structure and sorting mechanism of the rotating spiral chute make the beneficiation enrichment ratio large, the recovery rate is high, the adaptability is strong, and the principle of losing the early loss can be realized well. For the selection of coarse-grained materials, large-diameter snails are often used, while fine-grain materials should use smaller diameter snails. Table 2 shows the results of the recovery test of a native fine mud grade antimony ore with φ200mm and 940mm snail.
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