- The stickiness was reduced due to the removal of the clay content. - The sand discharged by the screen drains quickly and has sufficient stability to be transported by a conveyor belt, allowing for discharge onto the dam wall without the need for water. This reduces risk and facilitates pre-deposition sampling and quality control. 7. Conclusions Compared to hydrocycloning alone, sand discharged by the screen drains rapidly and has sufficient stability to be transported by conveyor, enabling discharge at the dam wall without the need to send water to the dam, decreasing risk and enabling pre deposition sampling and quality control. During the trial the mass recovered was less than the feed as expected if the slimes are removed. While the geotechnical properties of the screen product were not measured, it is expected that the slimes occupy void in the traditional sand and that the washed dewatered sand with the same cut size will have a lower bulk density after compaction requiring less sand for the same volume. The optimum moisture is also expected to be higher. With screen separated sand a smaller cut size than with hydrocyclones may be possible while maintaining acceptable permeability, compacted strength and mass recovery. ACKNOWLEDGEMENTS The authors would like to acknowledge the support and help received on this article from Metso. REFERENCES Sergio Barrera. (2015) ‘Reassessment of best available tailings management practices’, Proceedings Tailings and Mine Waste. Global tailings review org. (2020)’ Global Industry standard on tailings management. Mckinsey & Company, “The net-zero energy transition – what would it cost, what would it bring”, Jan2022 Metso Annual Report (2024), GRI supplements.
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