Grinding & Classification Circuits

Grinding & Classification Circuits 2017-04-04T06:57:16+00:00
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Checking cyclone sizing efficiency parameters (5 replies and 2 comments)

Arnmax
11 months ago
Arnmax 11 months ago

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.

Jorge Ganoza
11 months ago
Jorge Ganoza 11 months ago
6 likes by Charlie, mlticzon and David and 3 more...

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.

 

Arnmax
11 months ago

Thanks a lot for the contribution, i will work on it.
but what about inlet pressure of the cyclone feed can it also affect the effeciency of cyclone?

Paul Morrow
11 months ago
Paul Morrow 11 months ago
Arnmax
11 months ago

Thanks, it is very helpful

Paul Morrow
11 months ago
Paul Morrow 11 months ago

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.

Jorge Ganoza
11 months ago
Jorge Ganoza 11 months ago
3 likes by Arnmax, Charlie and David

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.

johnclark
10 months ago
johnclark 10 months ago
2 likes by Arnmax and David

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.

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