A leading manufacturer of bulk handling equipment in Brazil needed a system to control iron ore dust. When the rail cars are used by customers, they are inverted for unloading so the iron falls from the cars into chutes. The manufacturer’s customers could be jeopardizing the health of its employees and facing significant environmental fines without effective dust control. The manufacturer determined a specific volume of water with specific drop sizes was required to effectively suppress the dust without creating sludge.


The Spraying Systems Co. solution was a fluid delivery system including pumps, filtration, and three spray manifolds. One manifold, positioned above the tracks, sprays in a downward direction. Two other manifolds spray the iron ore directly as it falls from the inverted rail car. This arrangement effectively controls the dust during unloading.

The dust control system uses hydraulic nozzles and eliminates the need for the costly compressed air often required in other systems. The top header uses FullJet® full cone nozzles to provide a uniform distribution above the rail car. The headers spraying directly on the falling material each use VeeJet® flat spray nozzles for greater impact on the iron ore. Additional hydraulic fine spray nozzles are installed in the chutes below the rail car.
to further minimize the dust. More than three hundred hydraulic nozzles are used in the system. Centrifugal pumps supply water to the spray manifolds and liquid line strainers are used to prevent nozzle clogging and reduce on-going maintenance.


Dust is now effectively suppressed at the equipment manufacturer’s customer locations. A safe work environment for employees is ensured in the unloading area and customers are able to maintain compliance with environmental regulations, avoiding fines which could amount to several hundred thousand dollars per year. An additional benefit for end- user customers is that the system operates without costly compressed air and gives the manufacturer a competitive advantage.


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