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Effective dust control in large-scale mine conveying

Sandvik’s HX410 electrostatic dust suppression system will take on the challenge of transfer point dust suppression at German company RWE Power AG. The customer will evaluate the HX410 on a conveyor for lignite and overburden in the Garzweiler open pit mine. The conveyor has a capacity up to 37 500 t/h at a belt speed of 7,5 m/s (25 ft/s) and a belt width of 2800 mm (110 in).

Until now, RWE Power AG has used primarily water-sprinkling to reduce the dust to acceptable levels. At a transfer point, RWE Power AG cannot use water-sprinkling because of the coal-online-analytic-system which is installed in this place. One double HX410 will be installed on the upstream conveyor and a second double HX410 on the downstream conveyor. As the Sandvik HX410 has already proven its effectiveness and reliability in more than 200 applications, RWE Power AG decided to give it a chance to prove its abilities in the most demanding environment.

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 in comparison to conventional “suction-through-filter” or water-based systems. It is suitable for retrofits or installations on new conveyor systems. The HX410 ensures that chutes, loading points and transfer point don’t generate unacceptable dust emissions. Without proper dust control, each transfer point could generate more air-borne dust that eventually spreads all over the conveyor area. In most applications, a single HX410 is installed right after the chute on top of the belt.

Basically there are two different standard sizes available: 1, for belt widths 400 to 650 mm (16 to 25 in); and 2, for belt widths 800 to 1400 mm (31 to 55 in). For wider belts, custom made constructions can be offered by Sandvik. The power requirement for a standard system is below 500 W and maintenance time is less than 1 hour per month. The 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%.

Applications and use of the HX410 can be found at bulk material transfer points in industries such as: mining, aggregates, steel, cement, foundries, glass and paper. However, it is not suitable for environments with explosive dust.

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