The Rhosonics Slurry Density Meter (SDM) is used for different applications in the mining industry. For example, the instrument can be used for density control in the (re)grinding circuit, in the flotation circuit, in the tailings or in product thickeners and clarifiers among other slurry applications. Below we are explaining the benefits of measuring density in these mining applications.
Better control of the grinding circuit
Water impacts the grinding process, therefore the efficiency of the ball mill can be greatly improved by better water dosage. This alone could improve the efficiency with 5-15% according to 911 mettalurgist. When this is combined with a control strategy, the improvement rate could be even higher. There are different points for measuring density in the grinding circuit. One of the applications is to monitor the dillution of material in the ball mill discharge, to improve the efficiency of the process. Another important application is to monitor changes of density in the cyclone underflow, this can be done to check the process stability and increases or decreases of circulating load.
Read more about grinding circuit optimisation in our blogs (1, 2, 3) and let us know if you want to receive our free whitepaper about five reasons to measure density in the grinding circuit.
- Grinding circuit Blog 1/3: In-line measurement and process control
- Grinding circuit Blog 2/3: Effective grinding and optimal classification
- Grinding circuit Blog 3/3: Density to prevent problems with circulating load
Better control of the flotation circuit
Optimal flotation means reducing the amount of gangue that is sent together with valuable minerals to further stages of the process. An enriched product should be produced with the lowest energy costs, containing most valuable materials (the concentrate). Real-time density measurement can help to verify changes in the slurry from the grinding circuit to the flotation cells. The effect of flotation feed density on metallurgical performance has been investigated. Results of test work have shown that the pulp density affects key parameters of the flotation process in both the pulp and froth phases (Runge et al, 2012). One of the findings was that froth phase recovery presumably improves because of a stabilising effect due to a greater loading of solids on bubble surfaces. If you combine a density meter and a flow meter in the flotation feed and line of the final product of the flotation, this will allow a mass balance calculation and calculation of the efficiency of the circuit.
Read more about flotation circuit optimisation in our blogs (1, 2, 3 and 4) and let us know if you want to receive our free whitepaper about five reasons to measure density in the flotation circuit.
- Flotation Circuit Blog 1/4: Purposes and benefits of measuring density in flotation
- Flotation Circuit Blog 2/4: Effect of flotation feed density on metallurgical performances
- Flotation Circuit Blog 3/4: The role of the flotation operator and instrumentation
- Flotation Circuit Blog 4/4: How to prevent ore piling up in the flotation cells
Better control of the thickening process
In mineral processing operations, water is very important and therefore water recovery plants have an important position. According to CRC Care 2013, every year more than 10 billion tonnes of tailings are produced by mining activity. Thickeners can be used as a water recovery system, to meet requirements in the recovery and reprocess of water. A growth of 1 or 2% in underflow density can return large amounts of water to the operating installations. The increasing of density is also important to avoid accidents in tailings dams, which can collapse when there is too much liquid pumping to the dams. The thickening process can be monitored and improved by measuring density in the feed of the system, in the feedwell and in the underflow. Combined with a flow meter, the mass flow can be calculated, giving real-time insights about the effeciency of the thickener operation.
Read more about thickener optimisation in our blogs (1, 2 and 3) and let us know if you want to receive our free whitepaper about five reasons to measure density in the thickening process.
- Thickener Blog 1/3: Improve water recovery
- Thickener Blog 2/3: Improve metal recovery
- Thickener Blog 3/3: Improve flocculant use
Want to learn more?
Get in touch with Rhosonics for further information about density control for efficient mineral processing. If you want to learn more about our applications, then please also check our client cases or webinars.