At present, 80% of slurry pumps are widely used in factory ore dressing to transport slurry. Whether the flow rate, rotation speed and other parameters of the slurry pump are reasonable directly affects the service life of the pump. Choosing appropriate working parameters can not only give full play to the performance of the slurry pump, but also improve its service life. If the choice is improper, the slurry pump will not work properly, and may even cause production suspension in the ore dressing plant.
In order to fully utilize the performance of the slurry pump, it is necessary to fully understand the relationship between the slurry flow rate, rotation speed, etc., and the service life of the slurry pump in actual work. Due to the flow of ore slurry in the slurry pump, the ore slurry will cause impact and wear on the inner lining of the pump body. Obviously, with the same slurry properties, the slower the slurry flow rate, the lighter the wear of the pump body, and the longer the service life of the slurry pump. Therefore, the design flow rate should be as small as possible while ensuring the efficiency of the slurry pump.
Furthermore, the lower the pump speed, the lower the relative speed of the impeller and the slurry, and the slower the wear speed of the impeller. In addition, at the same flow rate, the larger the diameter of the impeller, the lower the rotation speed, the fewer ore particles per unit area, and the lighter the wear of the impeller. Therefore, the correct choice should be a large pump with low speed, which can extend its service life and reduce costs due to light wear.
In addition to flow rate and speed, the head also has a certain impact on the life of the pump. The actual head of the pump must be controlled within the withstandable range. Otherwise, too high a head will lead to excessive flow of the pump. On the one hand, it will cause evacuation and damage to the pump; on the other hand, too large a flow will increase wear and reduce service life.
Slurry pumps are commonly used in ore dressing processes and are mainly used for ore slurry transportation. Improper use of slurry pumps may affect their normal operation and production capacity. What problems can easily be caused by improper use of slurry pumps, and how to solve them to make the slurry pump run normally?
1. Long-term use of the slurry pump causes scaling on the surface of the cooler pipe wall, resulting in poor heat transfer; the cooling water volume is small or no cooling water is added. Therefore, it is necessary to check whether the bearing cooling water pressure and flow rate are suitable. Generally, the cooling water pressure of the slurry pump is 0.05~0.2MPa, and the cooling water flow rate is 1~3m³/h. Change the scaled cooler in time, turn on the cooling water before the pump starts to adjust the pressure to the specified value, and check the bearing temperature rise (35℃) regularly. The maximum temperature must not exceed 75℃.
2. During the use of the slurry pump, the seal fails due to packing wear, and the slurry leaks along the shaft seal. The slurry instantly fills the curved surface of the semicircular positioning hole of the bracket and the rear pump shell. The slurry discharged from the discharge port cannot be sealed into the oil pool through the water barrier plate, causing bearing damage. During daily maintenance, attention should be paid to regularly detecting the leakage of shaft seal water. When the leakage amount increases, adjust the bolts of the filler gland, and replace the packing and failed O-rings in time to prevent leaked slurry from seeping into the bracket oil tank from the waterproof plate seal along the shaft.
3. The lubricating oil is not clean, resulting in problems such as bearing friction, wear, heating, and vibration. Lubricating various parts of the bearing can reduce friction and wear. The quality of the lubricating oil should be checked regularly to prevent dust from entering or oil aging and deterioration. The lubricating oil should be adjusted strictly in accordance with the pump instruction manual, and it should not be too much or too little. If there is too much oil, most of the friction heat inside the bearing cannot be taken away, which will not play an effective role in heat dissipation and will also increase the temperature rise of the bearing; if there is too little oil, it will cause the bearing oil film to rupture and dry friction, burning the bearing.
These small problems with slurry pumps will have a great impact over time and should be checked and repaired in time to ensure the normal use of slurry pumps.