What key points should be grasped when using hydrocyclone?
Author: Time: August 7, 2020 107 views
What key points should be grasped when using hydrocyclone? Look down and give you a detailed explanation.
First, according to the size of separation and the amount of slurry treated, the structural parameters (size of each part) of hydrocyclone are selected.
2： Choose the right one Hydrocyclone Ore feeding mode. There are three ways of ore feeding: ① gravity feeding by height difference. ② Pressure stabilizing box feeding. ③ Sand pump direct ore feeding, one ore feeding mode requires a large height difference (generally more than 5m), which is difficult to achieve when terrain conditions are not allowed. The advantages of the two ore feeding methods are stable pressure, but the disadvantages are many pipelines, large slurry reflux, poor economic effect, and the third kind of ore feeding pipeline is less, with good economic effect, but the ore feeding pressure fluctuates greatly. At present, the third ore feeding mode (i.e. dynamic pressure ore feeding) is often used.
Third, stabilize the feeding pressure of hydrocyclone. Because the feeding pressure directly affects the processing capacity and grading granularity of the hydrocyclone, the higher the feeding pressure and the higher the slurry flow rate, the larger the treatment capacity of the hydrocyclone. At the same time, the rotation speed and centrifugal force of slurry in the hydrocyclone are also greater, and the grading particle size is smaller. After determining the classification size, a certain pressure is required to adapt to it. If the pressure is too high, the fine particles mixed in the grit will increase, and if the pressure is too low, the coarse particles mixed in the overflow will increase, which will reduce the classification efficiency.
When the sand pump is feeding ore, the pressure gauge should be installed on the feeding pipe of the hydrocyclone, so that the operators can grasp the working condition of the hydrocyclone and the abrasion of the sand pump in time. The volume of the sand tank should be large enough to make the sand pump work. Sand pump with rubber lining. The feeding pressure of hydrocyclone can be adjusted by adjusting the opening degree of the gate on the feeding pipe.
Fourth, pay attention to the change of the diameter of the cyclone. With the increase of grit opening, the amount of settling sand increases, the mass fraction decreases, the number of fine particles increases, the overflow decreases, and the overflow becomes smaller. On the contrary, when the ripping mouth decreases, the mass fraction of grit increases, the coarse particles in overflow increase and the overflow flow increases.
The change of grit opening can be judged according to the jet angle when the grit is ejected, which is generally in the range of 40 ° to 70 °. If the grit is discharged in a rope shape, it means that the sand setting mouth is small, and the sand settling mass fraction is high. If the grit is ejected in the umbrella shape, it means that the grit setting mouth is large and the sand setting mass fraction is low.
The grit setting mouth is easy to wear, so rubber lining or other wear-resistant materials are often used to slow down the wear. All kinds of grit taps have a certain service life, so they need to be replaced. If the size of grit opening needs to be adjusted frequently, the hydrocyclone with replaceable nozzle or cyclone with adjustable setting mouth can be selected.
Fifthly, the feed mass fraction should be appropriate. The mass fraction directly affects the mass fraction and particle size of the product. When the mass fraction of raw ore is too low, the classification efficiency is high, but the dry ore handling capacity decreases. When the feed mass fraction is too high, the viscosity of pulp increases and the classification efficiency decreases. Generally, the finer the grading particle size is, the lower the feed mass fraction is.