Steel and refining
Pelletising kiln
Also known as iron-ore pellet kiln, grate-kiln pelletiser, travelling-grate pelletiser.
A pelletising kiln indurates green iron-ore pellets — typically 9–16 mm diameter, formed by tumbling iron-ore fines with binder — into hardened pellets that can be charged to a blast furnace or direct-reduction plant. The two dominant designs are the grate-kiln (travelling grate followed by rotary kiln and annular cooler) and the straight-grate (the entire process on one continuous travelling grate).
Cleaning targets
- Kiln-exhaust ESP or baghouse — iron-oxide dust laden with bentonite binder
- Cooler off-gas dust collection
- Pellet-handling silos and hoppers — discharge bridging
Sonic-horn fit
Sonic horns on pelletising-plant ESP and baghouse hoppers handle the fine, sticky iron-oxide-and-bentonite dust that conventional handling struggles with. Plants in iron-ore-producing regions (Brazil, Australia, Sweden, Canada, India, Russia, China) are growth markets for this duty.
Related terms
Related terms
- Electrostatic precipitatorAn ESP removes particulate from flue gas by charging dust and collecting it on plate electrodes. Sonic horns are widely used to dislodge ash from plates and to keep hoppers from bridging.
- BaghouseA baghouse is the structural enclosure that holds the bags, cages, tubesheet, cleaning system and hoppers of a fabric-filter dust collector. Sized in compartments for online isolation.
- Rotary kilnA rotary kiln is a long inclined rotating cylinder where preheated raw meal is burned at 1,450 °C to form clinker. The heart of every cement plant.
- Sonic hornA sonic horn is a pneumatically-driven low-frequency sound emitter (typically 60–400 Hz at 140–180 dB SPL) used to dislodge particulate fouling from boilers, ESPs, baghouses and process vessels.