Efficient dust control for belt conveyor transfer points
Sandvik’s dust suppression system Clear is an electrostatic dust binding device for bulk material conveying systems, developped and widely used in Europe and offering guaranteed dust suppression of over 90%, has now been launched in Australia and South Africa by Sandvik Mining and Construction.
The system is ionization-based and has been designed to bind dust where it is formed. It is a simple system with very low operating and maintenance costs, offering many benefits over conventional water-based or filter systems. It is suitable for retrofit as well as installation on new conveying systems.
It is a modular construction that reliably ensures that the chute is not a source of dust emission. Especially at the transfer points from one belt to another the dust contained in the bulk material is blown into the air. To stop the dust from spreading all over the conveyor area the system is installed right after the chute on top of the belt. The bulk and the dust is led through its housing.
A corona electrode inside the Clear system ionises the air. The corona electrode is fed with 40 to 60 kV DC and a maximum of 1.5 mA.
The power requirement is below 500W and maintenance time is less than 1 hour per month.
The collision of the air molecules with the dust particles leads to electrostatic charging which causes the dust particles to move towards the housing and towards the bulk material.
A vibrator periodically shakes the housing so that the dust particles fall off and back into the process (on the conveyor).
The Clear system picks up particles in the range of 0.01 to 100 µm. The efficiency for an average particle size of 5 µm is always above 90%.
Advantages of Sandvik’s dust suppression system Clear:
• Dust suppression > 90%
• Simple modular construction
• Short installation time
• Low power consumption < 500W
• No wear
• No suction, no filters
• Minimum waste of material
• Low maintenance costs (no qualified workers required)
• Low costs of operation
• No disposal costs
• No change of material properties
Application area of the system
It is in use at bulk material transfer points in industries as: mining, steel, cement, foundries, glass, paper as well as in the aggregates industry.
Basically there are two different system sizes available. One from belt width 400 – 650 mm and one from 800 to 1400 mm. For belt width > 1400mm custom made constructions can be realised.
At the time there are approximately 160 units in operation in various applications world wide.
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