Principle of Operation

The Level and Density Transmitter (FLD) has been specifically designed for extremely difficult Level applications in the Mining Process area like the Outfeed Sump of a Ball Mill, where there could be difficulties in installing standard level transmitters because of a limitation of space, or a very difficult environmental problem. This Outfeed Sump of the Ball Mill also has a requirement for measuring the Suspended Solids Density. The Pulp/Slurry is pumped to the inflow of Cyclones and it is very important to control the solids density inflow to the Cyclone. So, the measuring of the Solids Density will control a Water Addition valve that will add or subtract water to the sump to control the exact Solids Concentration. The main design features are that the FLD system is self-cleaning, so will work in a very difficult environment that could have build-up issues as well as high agitation. The Level system is not affected by density change, froth or scum on the surface of the slurry and will provide a reliable level reading in high turbulent agitation.
The unique operating acoustic system will detect the interface between air and slurry, because of the large change in Acoustic Impedance. All transducers that are below the Pulp/Slurry level, will also measure the Acoustic Impedance changes that occur when the Solids Concentration changes. This acoustic measurement of solids density can detect 1% changes in solids density and is not affected by impurities in the ore, like Nuclear Density technology is. So, Iron, Magnetite, Clay and other impurities in the ore will not affect accuracy of solids density. This means the FLD can measure the correct solids density, no matter what the ore characteristic makes up is and provide stable repeatable control for Water Addition.

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Typical Uses

BALL MILLS