by Detlef Bunzel, Evonik, Germany
Dosing and mixing are two of the major procedures in feed
milling. Getting them right can have a significant impact on feed quality and
the cost effectiveness of the process.
The design of this process depends on the number and
properties of ingredients, dose rates and required output. Feed production
ingredients are usually mixed in a batch, due to the amount of ingredients and
frequent changes in feed formulation. Even though the number of ingredients may
vary, different groups can be classified:
• Main
ingredients (soy, corn and wheat etc., typically > 5% of the formulation)
• Minerals
and major additives (limestone, salt, phosphorus etc., 1-5% of the formulation)
• Micro
ingredients (amino acids, vitamins, < 1% of the formulation)
• Medication
(<< 0.1%)
Most of these ingredients (typically > 95%) are added as
dry bulk. Dry bulk ingredients are weighed on scales per batch and the accuracy
of scales depends on their weighing ranges. Therefore, individual scales with
corresponding and appropriate weighing ranges are needed to weigh main, minor
and micro ingredients (Regulation (EC) No 183/2005 of the European Parliament,
Annex II).
Dry bulk ingredients are loaded into the mixer, after dosing
and weighing, at the beginning of the mixing cycle.
Certain ingredients are added as liquid (oil, fat, molasses,
water, acids and other additives, usually < five percent. These are dosed
via flow meters or on scales and sprayed onto the dry mash during the mixing
cycle. In order to ensure continuous operation of the pellet mills, the
capacity of the batch mixing line will be defined based on the design capacity
of the pelletising line.
Read more HERE.
The Global Miller
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which is published by Perendale Publishers Limited.
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