The concentration of ore to the ore dressing should ensure that the slurry has sufficient fluidity along the bed surface and can be stratified, and the water depth can be immersed in the ore. In general selection, the concentration of coarse sand is 20 % to 30 %, and the concentration of fine grain is 15 % to 25 %.
In some plants, the capacity of Slurry Pump is calculated based on the maximum demand of the process; which occurs only part of time. The excess capacity is usually controlled through a control valve; as a result, a lot of energy is wasted. In order to better meet the requirements of process capability or pressure, the flow control methods of throttling, by-pass control, speed control, impeller trimming and Variable Speed Drives (VFDs) are developed. Variable Frequency Drives (VFDs) are by far the most popular and effective type of adjusting the pump speed. Practice tells us that it is possible for VFDs to save 20-30% of the energy efficiency of the pumping system.
1. Saving energy
The VFD controls the motor and automatically adjusts the motor load to make the motor run in an economical running state to achieve the effect of power saving.
2. Lower operating cost
The VFD can greatly reduce the energy cost of the motor, reduce the impact on the equipment after the frequency conversion start, and reduce the maintenance and repairing capacity, so the operation cost will be greatly reduced.
3. Improve pressure control accuracy
The VFD has accurate pressure control ability, which effectively improves the quality of system working condition.
4. Extend the service life of the motor
From the 0Hz starting motor, the starting acceleration time of the VFD can be adjusted to reduce the impact on the electrical and mechanical components of the motor when starting, so as to enhance the reliability of the system and prolong the service life of the motor. In addition, the VFD can effectively reduce the peak value of starting current to a minimum, and can reduce the impact on the grid and other electrical equipment.
5. Reduce the noise of the motor
According to the working condition of the motor, the motor running speed is slowed down obviously after the VFD is installed, so the noise of the motor running is effectively reduced.
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