When Recleaning Screenings Can Retain Useful Grain

Collected screenings can still hold useful grain

If your collected screenings contain useful grain mixed with dust, chaff and debris, another cleaning pass can separate grain worth keeping. Airflow fits lighter unwanted material that responds differently to air; screens fit debris that differs in size. Recleaning is worth trying when that grain has a practical use and its added value can cover the extra processing and handling.

Compare another pass with using the screenings as they are

Start with the collected material as a separate cleaning job. Identify the grain you want to keep and what you would use it for. Then compare two options for the same batch: use the screenings as they are, or separate useful grain and handle the remaining material separately.

For the second option, count the value of the retained grain and any value left in the removed material, then subtract the added cleaning and handling costs. Compare that result with the screenings’ current value—not with zero. Include extra transportation or storage only where another pass actually adds them.

These cost categories also appear in USDA’s 1996 U.S. soybean-cleaning analysis, which counted cleaner operation, transportation and storage among costs and screenings sales among benefits. Use your own costs and values for today’s decision.

Allow for the material’s condition, too. Metra’s operating experience indicates that heavily contaminated grain may need a lower feed rate to improve cleaning quality, which matters when estimating processing time.

Match the separation to what surrounds the grain

Light chaff mixed with useful grain is an airflow job when the two respond differently to air. ADS and ADS-CDC separate material into fractions, allowing useful grain to collect separately from lighter unwanted material. Adjustable airflow lets the operator tune the separation to the collected material and the grain worth retaining. This is not simply a size distinction: shape, dimensions, mass and density all affect how material responds to air.

Dust handling helps distinguish the configurations. ADS-CDC includes a cyclone dust collector. ADS without CDC is specified for outdoor use because dust exits with the air.

Debris that is sufficiently smaller or larger than the useful grain points toward VDSC size screening. VDSC removes debris, chaff and dust, and it is Metra’s lower-priced standalone option compared with ADS or ADS-CDC when size screening is sufficient.

Some collected material presents both jobs. When size-different debris is difficult to separate by air alone, VDSC can screen it first, followed by ADS to separate the remaining grain fractions. Use the combination when both separations contribute—not simply because the screenings look dirty.

See what your collected material can yield

Arrange a free test of your own collected grain screenings with Metra. Compare the original sample, retained grain and removed fraction to see the useful grain kept apart from the debris. You do not need to choose a machine first: the team can use your material, intended use, throughput and site needs to recommend suitable equipment and settings.

Contact [info@graincleaner.com](mailto:info@graincleaner.com). Your Metra manager will agree on the sample quantity and confirm shipping arrangements and any associated costs before you send it.