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This paper investigated the multistep hydrocyclone particle classification for efficient and environmentally-safe use of by-product slurry from waste concrete treatment. The sludge obtained from the de-watering process of waste concrete treatment slurry is mixed with tap water at different solid-to-liquid ratios (%). Overall, the multistep hydrocyclone system appropriately classified the waste concrete slurry into three different particle sizes. Nevertheless, selectivity increase was observed with particle size under 2 μm regardless of the solid-to-liquid ratio. It is induced by scrubbing of the aggregates during particle size measurement, which were discharged as underflow during the hydrocyclone process. The multistep particle classification system proposed in this study effectively separated the fine particles in the slurry emitted from waste concrete treatment.

Study on the Classification of Fine Particles by Using a Multi-step Hydrocyclone for the Recycling of Waste Concrete Slurry