Gas Flow Classification

• Zigzag sifters permit classification of solid compounds.
• The solid compound being separated is charged into the feed hopper.
• The compound is fed into the zigzag duct of the sifter at mid-height by way of a vibrating trough.
• An air stream flows upwards through the vertical duct.
• Depending on the geometry and density of the particles, they are carried along by the air or drop down due to gravity.
• At every bend in the duct the solid compound passes through the air stream and falls onto the opposite wall of the sifter.
• This corresponds to one sifting stage.
• Owing to the flow conditions, a vortex wake is formed between two bends of the zigzag duct.
• It ensures that the solid matter moves roughly perpendicular to the airflow.
• In this way, a transverse sift takes place at every bend.
• Sequencing of large numbers of such stages results in very fine separation.
• Features a 20-stage zigzag duct.
• Transparent material provides optimum observation of the processes in the duct.
• A fan generates the airflow.
• The airflow rate and the solid mass flow are adjustable.
• The fine material transported upwards with the air stream is separated by a cyclone.
• Pressure measurement points at the relevant positions in the trainer enable to determine the pressure loss.
• Sand in different particle sizes is recommended for use as the feed material.
• For particle size analyses of the feed and of the coarse and fine material, a balance and a screening machine are recommended.
• The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

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