A sampling of streams of slurry for mineral processing has been an area of concern for many decades now. The critical thing is that these Slurry Samplers should be designed so that they conform to the sampling theory principles and provide a sample irrespective of the equipment age or the solid build up due to operating issues, reports Two Samplers are mainly used in a mineral processing unit, the metallurgical and the process control samples. They are very distinct in their approach, but the ultimate goal of both of these two classes is to provide a sample which can ultimately represent the original slurry stream.

Process control samplers
The purpose of this class of sampler is to provide valuable information to the processing team so that they can make well-informed decisions and to calibrate the instrumentation to produce the best possible results. The simplest way to increase profit in a processing plant these days is to decrease the response time needed to changes as well as being able to efficiently detect these changes.
These Samplers are useful in detecting the process variations like mineralogy, reagent control changes, level control and air float changes, wear and tear of the equipment and much more. The process control samplers are highly efficient in all these realms

Manual Sampler Cutters: Mineral processing plants still use manual sampler cutters extensively; a manual cut is used to make decisions in process control. This method is considered by experts as the worst possible method of sampling, as a manual process can cause many errors.

Poppet samplers: This sampler was created to replace the manual ones. A fixed amount of sample is provided and is timed as needed, so it is free of manual intervention, and hence samples are human error-free. This sampler provides a reliable sampling produce regularly.

Metal accounting samplers: This type of samplers is used when accuracy is needed. For any sampler to be passed off as a metallurgical sampler is that the cutter processes the whole process stream while taking a cut. This methodology of cutting through the complete process stream will represent a sample of high quality. These samplers are sophisticated equipment which is capable of conditioning the stream.

Secondary sample cut: When the cutter moves across a process stream at a constant rate, it produces a sample large enough for a secondary cut. A ‘Vezin’ type sampler is used for secondary sampling. This sampler also has to adhere to the same rules of cutting across the entire stream to qualify as a final metallurgical sample.

Compared to the metallurgical samplers the process samplers still vastly use manually collected samples which increase the risk of human errors. That, in turn, leads to bad process control decisions. To minimize such risks, use of poppet samplers for process control is advisable. There are also many grade analyzers online which are used with poppet samplers. The mineral processing plants these days have a lot of Samplers to choose from which can meet all the requirements of the facility along with low cost.

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