Common production phenomena of cyclones and mastery of main operating parameters A hydrocyclone is a device that uses water as a medium to classify slurry by centrifugal force. The utility model has the advantages of simple structure, light and flexible, no moving parts, convenient assembly and disassembly, convenient maintenance, small occupied area, large capacity of unit volume processing, high classification efficiency, and the like, and is gradually being promoted and applied in mining enterprises. Longqiao Mining Concentration Workshop is currently at 60 Two-stage grinding grade of 10,000 tons of plant, 20 The second-stage grinding classification and the copper- sulfur mixed regrind grading of the 10,000-tonne plant are respectively used in different types of three-group cyclones, and the effect is good. A grading equipment for the second phase of the company will also use a hydrocyclone to replace the spiral classifier currently in use. The following is a summary of the common production phenomena and main operating parameters of hydrocyclones:
First, common phenomena
      1 Intermittent overflow:
the reason: 1. Pump gasping: The ore process is unstable to the mine; 2. The pump displacement is too large, and the pump pool slurry is often evacuated; 3. The cyclone selection is too large, resulting in low ore pressure.
Approach: 1. Stable operation to ensure the liquid level of the pump pool; 2. Replace the pump or add water to the pump tank to prevent the slurry from being evacuated. However, the concentration of the feed into the cyclone should not be too low, and the concentration of the too low grit sand is also low, which affects the grinding concentration of the mill; 3. Select a suitable cyclone.
      2 Low concentration of grit:
the reason: 1. The diameter of the sinking nozzle is too large; 2. The pressure is small; 3. The concentration of the ore is low, and the diameter of the cyclone is large.
Approach: 1. Replace the grit nozzle with a small diameter; 2. Increase the pressure of the cyclone feed; 3. Increase the concentration of the ore and replace the cyclone with a small diameter. In the actual production, the above factors can be adjusted according to the actual situation. For example, if the pressure caused by insufficient swirling of the cyclone is small, the production water can be appropriately added; if the concentration is low, the treatment volume can be appropriately increased. .
      3 The overflow runs rough:
the reason : 1. The swirler feeds the coarse grain size; 2. The diameter of the grit chamber is small, and the grit nozzle is blocked by coarse particles or other debris. The overflow run is mainly characterized by low grade of concentrate, large concentration of grit, coarse grain size and low moisture of filter cake; if it is blocked by grit chamber, it will cause full magnetic phenomenon of magnetic separator.
Approach: 1. Control to reduce the particle size of the cyclone feed, appropriately reduce the concentration of the ore and increase the pressure; 2. Replace the larger diameter sanding nozzle according to the actual production situation, switch to the spare cyclone, and clear the plugging cyclone.
Second, the cyclone operating parameters and control:
The main parameters: 1. The ore pressure is generally 0.15~0.25Mpa; 2. The concentration of ore is generally 22%~35%; 3. The concentration of the sinking mouth is generally 65%~75%; 4. The overflow concentration is generally 20 %~25%;
Parameter control:
1. The ore pressure is too low, the classification efficiency is reduced, and the fine-grained minerals in the grit are entered into the ball mill , resulting in over-grinding. If the pressure is too high, the cyclone will be easily worn by the mine pipe and the cyclone, and the service life will be reduced.
2. The concentration of the ore is too low, and the concentration of grit is low, which affects the grinding efficiency. If the concentration is too high, the classification efficiency will also decrease, and the overflow particle size will be coarse, which will affect the concentrate index.
3. The concentration of grit is low, the concentration of grinding machine is low, the residence time of the slurry in the mill is short, the grinding time is short, the grain size of the ore is coarse, the vicious cycle is easy to occur, the classification efficiency is decreased, and the overflow particle size becomes coarse. If the concentration is too large, the cyclone will be difficult to discharge, and the grit chamber will be easily blocked. The overflow particle size will also become thicker.
4. The overflow concentration is too low, and the sorting operation is given. The pulp speed is faster and the sorting effect is poor. Excessive pulp has poor fluidity and is easy to block pipes and magnetic separators. |
