Increasing Yield Through Toll Sifting with Elcan Industries

Increasing Yield through toll sifting with Elcan Industries
When it comes to processing valuable powders, maximizing the yield of good product is arguably the most essential step in the process.

By maximizing yield, companies ensure that they are getting the highest return on their investment in processing by guaranteeing that at least 95% of good powder is being captured and not put into waste or off-grade product streams. Elcan Industries uses a proprietary line of sieving equipment that does just this. This superior technology combined with 30 years of screening experience allows companies to achieve yields of 95% and up. If you are struggling with rerunning material or having to regrind powder that wouldn’t pass through the screen, we are here to help.

The first step in measuring your potential yield is conducting a particle size analysis. This can be done using a multitude of equipment, but the most common ways are through ROTAP (sieve analysis), jet sieve, and using a laser system to measure the particle size distribution. This will tell which sieve sizes need to be used. Elcan Industries uses this information to quantify the efficiency of the screening. The first step is putting in the exact screen sizes required to efficiently achieve the highest yield. This means that if a company wants powder that is below 44um and above 20um, that 44 and 20um sieves are used, not a 53um and a 25um, to “cheat the hole.”              

Now that the screens have been chosen, Elcan will start running powders through the Hi-Sifter sieving system. Unlike Ultrasonic and vibratory screeners, the Hi-Sifter employs a low frequency, high amplitude approach to sieving, which prevents blinding and results in a much more efficient cut and higher yield. The best way to measure yield is to look at the amount of fines remaining in the oversize. This will tell you how much material did not pass through the screen that should have and will quantify how well the machine is running. In the example below, the customer’s product was -44 microns +20um. Looking at the +44um, you can see zero percent below 44um remaining in the oversize fraction.

This demonstrates that all of the potential powder that could be recovered is being removed, hence maximizing the yield. This measurement is deemed the “out of spec,” and companies that work with Elcan always see an out of spec below 5%, meaning a minimum yield of 95%. This cuts down on reprocessing costs while also maximizing the amount of good powder received by the client. If the out of spec is above 5%, Elcan observes which particles did not pass through the screen and makes adjustments based on these observations. There are many reasons why and this is where Elcan’s vast experience in the powders business comes into play. If you are working with a toller or using conventional and ultrasonic sieves, there is a good chance that multiple passes are being done or good material is being sent to regrind. Call Elcan today to see how we can help maximize your yield with the toll sifting services we offer.

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Elcan Industries offers unparalleled levels of screening capabilities that provide excellent efficiencies on even the hardest to screen chemicals, powdered metals, glass and ceramics, foods, plastics, minerals, oil drilling muds, pharmaceuticals, electronic materials, and coating systems.

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