The factors affecting the selection of centrifugal concentrator are the structural parameters and process parameters of the equipment. (1) Equipment structure parameters 1 drum gradient directly affects the flow rate of the slurry in the centrifugal concentrator, thus affecting the concentrate yield. The slope is large, the concentrate yield is small, the concentrate grade is high, and the concentrate recovery rate is low. If the slope is too large, the slurry flow rate is too fast, and the concentrate is difficult to deposit on the drum wall, and the sorting effect is not obtained. On the other hand, if the slope is too small, although the concentrate yield is large and the recovery rate is high, the concentrate grade is low, and the treatment volume is lowered due to the small flow rate. Therefore, the slope should be appropriate. 2 Drum diameter and length Drum diameter mainly affect the processing volume, large diameter, large selection area, high processing capacity. When processing a tin sludge, 800mm diameter centrifugal concentrator, the processing capacity can be up to 30 t / (day · Taiwan) about. The length of the drum mainly affects the recovery rate, the drum is long, the sedimentation time of the ore is longer, and the recovery rate is higher, and vice versa. (2) The process parameters include the ore size, the ore supply volume, the ore concentration, the feed time and the drum rotation speed. 1 The ore-bearing particle size has been proved by production practice that when the upper limit of the ore-feeding granularity of the centrifugal concentrator is greater than 74 μm, the rinsing of the concentrate is difficult, which affects the selection index. The more effective particle size recovery range of a typical centrifugal concentrator is 37^-10 microns. Of course, the optimum feed size should be determined after testing based on the nature of the ore and the requirements for the mineral processing product. 2 The ore volume of the ore-concentrating centrifugal concentrator affects the condition of the upper membrane of the drum wall. If the ore volume is too large, the flow rate is fast, the sorting effect is low, and even the sorting effect is not obtained. Figure 3-26 shows the test results of a sand-tin mine, showing the relationship between the ore volume and the selection index. It can be seen from Fig. 3-26 that the ore supply volume of the centrifugal concentrator increases, the concentrate yield and recovery rate decrease, and the concentrate grade and tailings grade increase. When the ore concentration is 15%~20%, the suitable ore supply volume is: rough selection 90-100 liters/(minutes/sets), and selected 70~80 liters/(minutes/sets). 3 The concentration of ore concentration given to the ore concentration has a great influence on the production capacity of the centrifugal concentrator, and also affects the selection index. Figure 3-27 shows the relationship between the concentration of the ore and the selection index. It can be seen from Fig. 3-27 that under other conditions, within a certain range, the concentration increases, the concentrate yield and recovery rate increase, but the concentrate grade decreases. The appropriate ore concentration should be determined according to the quality of the ore. When processing tin ore, the appropriate ore size is 20%~25% for rough selection and 15%-20% for selection. 4 feeding time centrifugal concentrator in the continuous feeding process, the tailings grade increases with the increase of the feeding time, until the instantaneous tailings grade rises close to the ore grade, then the sorting effect is not obtained. It only plays a role in transportation. Therefore, the timing of the mine should be appropriate. The feeding time is too long and the recovery rate is low; if it is too short, the concentrate grade is low, the equipment is effectively used for less time, and the processing capacity is low. Generally, when processing tin mud, the feeding time is preferably 3 minutes. Figure 3-28 shows the relationship between the feeding time and the selection index. 5 Rotating drum speed increases the drum speed can increase the centrifugal force, the pellet settlement is accelerated, and the recovery rate can be improved, but the concentrate grade decreases. The appropriate speed should be determined according to the nature of the ore and properly matched with the volume of the ore. It should be noted that the impact of each of the above factors refers to the general situation. For the selection of ore of different nature, it is necessary to test to determine the best selection conditions. Gym Spin Bike,Used Spin Bikes,Spin Cycle Bike,Spinner Spin Bike ZHEJIANG POWERTECH CO,.LTD , https://www.chinatattoo-supplies.com