Blog: Measuring density in the thickening process

Posted on Friday, 21 February 2020 at 13:35

In the last weeks we have shared information about the important reasons for density measurement in the underflow, overflow and the feed of a thickener. We described the importance of water recovery, the investments that help to improve the recovery of valuable minerals and the efficient use of flocculants.
In this last blog about this subject, you can read other reasons for process control.

It is important to control the thickening process, because if this process is incorrectly managed, this may lead to additional costs and have a negative effect on the profitability and sustainability of the operation.

Examples of negative effects are:
• Wasting water, due to losses to the tailings or environment
• Recirculation of already treated ore and chemicals in the process water
• Increased costs due to excessive use of chemicals
• Increased maintenance costs for upstream equipment
• Loss of valuable product

Investments in technology (e.g. measuring instruments) can directly result in better control of the thickener operation. Sensors allow operators to monitor performances of thickeners and help them to meet water recovery and metal production requirements.

Example of different measurement points at a thickener tank


Density measurement is usually done by radiation-based measuring devices. This technology has been used in the mineral processing industry for decades. However, nowadays government regulations are getting stricter and more nuclear density meters are being replaced by alternatives. These alternatives can do the same job, without administration costs and health and safety risks related to the nuclear source.
Besides density, flow measurement is also important for monitoring the operational performances.

The eco-friendly Rhosonics Slurry Density Meter (SDM) has been introduced in 2016 and is the first real alternative to substitute nuclear density meters, reaching hundreds installations worldwide in just a few years.

Rhosonics Slurry Density Meter (SDM) with a wafer

Please contact Rhosonics if you want to learn more about the importance of density measurement in the thickening process.

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Tags: SDM Density Meter, Densimetro no nuclear para pulpa, Espesador, Densímetro não radioativo para polpa, Non-nuclear, Non Nuclear Density Meter, Thickener