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Checking cyclone sizing efficiency parameters (6 replies and 3 comments)
It is necessary to take samples from the different streams of the grinding circuit to get a complete information. Regarding the hydrocyclone, it is important to get samples from the feed, overflow, and underflow. In order to do this, you should make sure the operation is in steady state, otherwise, the samples will not be representative.
Some parameters can be recorded in the plant (e.g. percent solids, slurry density) using a Marcy Scale. It is possible to confirm them in the met lab. Once you got the samples, you should determine the particle size distribution on each stream. That information will be useful to determine the circulating load and the hydrocyclone efficiency. A Tromp Curve should be built to get more information (e.g. D50).
A mass balance should be part of your study.
Good for cyclones also https://www.911metallurgist.com/blog/formula-to-calculate-a-classifier-and-screen-efficiency
Yes the higher the cyclone feed pressure, the higher its efficiency. See https://www.911metallurgist.com/blog/hydrocyclone-workingprinciple in text and videos for full explanation.
Obviously, the hydrocyclone feed pressure is important. It is one of the parameters that should be recorded at the moment of taking samples. If you want to evaluate the effect of the pressure, the hydrocyclone feed pump should be equipped with a variable speed drive system. Some models include the hydrocyclone feed pressure and you can use them to get some initial information on the hydrocyclone. The apex diameter is other thing to evaluate. Also, it is possible to add a second cylindrical section and evaluate its effect on the hydrocyclone overflow.
There many things to evaluate, but the first step to take samples and determine the hydrocyclone efficiency.
As well as taking samples and determine the hydrocyclone efficiency, I'm inclined to revisit the original cyclone design to see if your cyclone is in the right ballpark for cyclone size/shape/etc. (cyclone diameter, feed, OF and UF diameters, cyclone angle, etc.). Are the feed OF and UF diameters hydraulically adjustable? I found that water injection at the conical section (K-H water injection) increased the separation efficiency at the designed D50 particle separation size - the S-curves became much steeper, with fewer fines in the underflow, and less over-grinding of the fines.
i am planning to check the efficiency of a primary cyclone that is used at a processing plant, so i would like to know what parameters should i check in order to determine its efficiency.