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Volume 115
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Dust release from various small-scale belt conveyor setups discharging into a wind tunnel – experimental investigation using different limestone qualities (Open Access)
Marcus Weidemann *, Eberhard Schmidt
Institute of Particle Technology, University of Wuppertal, 42119, Wuppertal, Germany
10.1016/j.partic.2026.05.016
Volume 115, August 2026, Pages 202-213
Received 28 July 2025, Revised 20 April 2026, Accepted 19 May 2026, Available online 28 May 2026, Version of Record 5 June 2026.
E-mail: weidemann@uni-wuppertal.de
Highlights

• Different limestone fractions discharged into a wind tunnel from a conveyor belt.

• Coarse material emits dust mainly upon impact on the bulk pile.

• The microscopic mechanism can be described by a literature model, consisting of fine dust-laden coarse particles.

• Fine material emits dust mainly by collision of loose agglomerates while falling.

• The microscopic mechanism can be described by a literature model, which consists of agglomerates breaking upon impact.


Abstract

To investigate the release of dust, coarse (x50.3 = 980 μm) and fine (x50.3 = 3.6 μm) limestone was discharged into a wind tunnel using a model conveyor belt. Different test setups were used to measure the dust release in different phases of the discharge. The discharge mass flow, belt speed and wind tunnel air velocity were varied. Systematic differences were found between the two size fractions. The dust release of the fine material mainly takes place during the fall, while the dust release of the coarse material is dominated by the impact on the bulk pile. For the coarse material, a model for the individual release of dust-laden coarse material particles from the literature can be used as an explanatory approach. A different explanatory approach is required to describe the release of dust from the fine material.

Graphical abstract
Keywords
Dust; Dust release; Bulk material handling; Belt conveyor; Discharge
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