Cannington Paste Plant

Measuring Task

Density determination of a solids slurry.

  • Pipe diameter: 254 mm (10 inch)
  • Pipe material: Steel
  • Solids: 60wt%
  • Density: 1000 – 1700 kg/m3


South32 wants to know how much slurry is going to the storage tank, and measure and control the density for improving and optimizing this stage of the process.

Instrument used


The Rhosonics Slurry Density Meter is a great choice to determine the density of slurry going to the storage tank. Additionally, together with the output of a magnetic flowmeter the mass flow can be calculated. Furthermore, by using ultrasonic technology the operation can run without using radiation sources.


After four years of using the Slurry Density Meter in a very abrasive slurry stream, it is operating well and the sensor is still in a good condition. Due to a small interference of scaling, South32 thought that the sensor had to be replaced. However, it was not needed because the sensor surface was cleaned with a sandpaper, which helped the SDM operate well again.

The staff at South32 experienced several advantages of using the SDM. They did not have to register a nucleonic device to do the same duty and it is a simple and cost- effective solution.

  • No special licenses
  • Good accuracy
  • No radiation
  • No end-of-life disposal costs
  • No sampling
  • Real-time and reliable measurements
  • No restricted area

We installed the density meter in a very abrasive slurry stream as a trial and it has performed very reliably for us for four years. We are using it in an application where it really picks up the difference between water and a slurry with 60% solids, and it shows good accuracy. We are interested in trialling elsewhere in the plant as potential replacements of nucleonic density meters to see if we can remove the risks

Kevin Pery, South32

You can read the whole story in the case study. Click on the image below to download it.

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