The Main Factors Affecting the Centrifugal Concentrator

The factors influencing the selection of the centrifugal concentrator include the structural parameters and process parameters of the equipment.

The factors influencing the selection of the centrifugalconcentrator include the structural parameters and process parameters of theequipment. Detailed analysis is as follows.

First, the equipment structure parameters

1. Drum slope. It directly affects the flow rate of the pulp inthe centrifugal concentrator, thereby affecting the concentrate yield. Highslope, low concentrate yield, high concentrate grade, and low concentraterecovery. If the slope is too large, the flow rate of the pulp is too fast, andthe concentrate is difficult to deposit on the drum wall, and the sortingeffect is not achieved. Conversely, if the slope is too small, although theconcentrate yield is high and the recovery rate is high, the concentrate gradeis low, because the flow rate is small, the processing volume will be reduced.Therefore, the slope should be appropriate.

2. Drum diameter and length. The drum diameter mainly affects thethroughput. Large diameter, large selection area, high processing volume. Whenmeasuring a tin slime, the 800-mm-diameter centrifugal concentrator has aprocessing capacity of about 30 tons per day.

The length of the drum mainly affects the recovery rate. The drumis long and the settling time of the mineral pellets is longer, the recoveryrate is higher, and vice versa.

Second, the beneficiation process parameters include the size ofthe ore, the size of the ore, the concentration of the ore, the time of theore, and the rotation speed of the drum

1. To the ore size. According to the production practice, when theupper limit of the particle size of the centrifugal concentrator is greaterthan 74 microns, it is difficult to flush the concentrate and affect thesorting index. Generally, the effective size recovery range of the centrifugalconcentrator is 37-19 micron. Of course, according to the nature of the ore andthe requirements for the ore dressing product, the optimum grain size should bedetermined after the experiment.

2. To mine the volume. The size of the ore-feeding of thecentrifugal concentrator influences the condition of the upper wall of the drumwall. If the ore-feeding volume is too large, the flow rate is fast, thesorting effect is low, and even the sorting effect cannot be obtained.

3. To ore concentration. The size of the ore concentration has agreat influence on the production capacity of the centrifugal concentrator andalso affects the sorting index.

4. Feeding time. In the continuous feeding process of thecentrifugal concentrator, the tailings grade increases with the increase of thetime for the ore supply, until the instantaneous tailings grade rises and thegrade of the ore is close, so that the sorting effect can not be achieved atthis time, but only transportation effect. Therefore, the time for ore supplyshould be appropriate. The time for the mine is too long and the recovery rateis low. If it is too short, the grade of the concentrate is low, the equipmentcan be used effectively for a short time, and the processing capacity is low.When tin ore is generally treated, it is advisable to provide 3 minutes of timefor the ore.

5. Drum speed. Increasing the rotation speed of the drum canincrease the centrifugal force, accelerate the settlement of ore grains, andincrease the recovery rate, but the grade of concentrate decreases. Theappropriate rotation speed should be determined according to the ore'sproperties, and it should be reasonable with the ore volume.

It should be pointed out that the influence of the above factorsrefers to the general situation. For sorting ore of different nature, the bestsorting conditions should be determined through experiments.