Iron ore tailings pond dredging


One of the world's largest mining companies ordered a Dragflow Dredge DRH85/180E22 for an iron mine in Brazil.
The iron ore, mixed with water, is pumped from the mine to the shore for more than 310 mi. through a Mineral Duct pipeline. Once the mineral arrives to the port terminal, it gets separated from the water and loaded on barges for the ocean transportation.
The problem
Along this pipeline are some booster stations and speed control valves. When those are under maintenance, they need to stop the pumping to the shore, and the material is diverted and discharged into a tailings pond.
It is crucial for the operation to maintain the maximum capacity of this pond in case they need to deal with emergencies.
For this reason, the customer needed a machine capable of dredging the iron tailings and returning them to the circuit going to the coast.
The tailings have a high iron content with a specific gravity up to 305 lb/ft3. Only a super duty dredging pump with an oversize motor could do the job.
Our solution
Dragflow supplied a DRH85/180E22 dredge equipped with a dredging unit composed of one Hydraulic Pump HY85/180A, two hydraulic cutters EXHY20, and a water jet ring system.
The Hydraulic Power Pack is driven by a 268 HP / 200 kW electric motor and the power cable is floating from the pond shore to the dredge.
The dredge can be operated in two ways: using the control panel at the cabin, and from the shore through a wireless remote control with a  joystick as well.