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 > five percent of the formulation)
• Minerals and major additives (limestone, salt, phosphorus etc., one-to-five percent of the formulation)
• Micro ingredients (amino acids, vitamins, < one percent of the formulation)
• Medication (<< 0.1 percent)
Most of these ingredients (typically > 95 percent) 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.
Mixing line capacity
Production capacity of the feed mill is defined based on continuous processes in tonnes per hour. For the mixing line equipment, this must be transferred into batches per hour as mixing is a batch process.
Each given output can be met by varying batch size and batch frequency. Batch size is defined in weight units as bulk batches are assembled on scales.
Read more HERE.
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 > five percent of the formulation)
• Minerals and major additives (limestone, salt, phosphorus etc., one-to-five percent of the formulation)
• Micro ingredients (amino acids, vitamins, < one percent of the formulation)
• Medication (<< 0.1 percent)
Most of these ingredients (typically > 95 percent) 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.
Mixing line capacity
Production capacity of the feed mill is defined based on continuous processes in tonnes per hour. For the mixing line equipment, this must be transferred into batches per hour as mixing is a batch process.
Each given output can be met by varying batch size and batch frequency. Batch size is defined in weight units as bulk batches are assembled on scales.
Read more HERE.
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