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Slurry transport uses several methods: hydraulic conveying; conventional lean slurry conveying; and high concentration slurry disposal. The latter, HCSD, is a relatively modern approach, which is used to transfer high throughputs of fine fly ash over long distances using high pressure diaphragm pumps with velocities of around 2 m/s. Ash disposal is simple as the ash solidifies easily and the system does not produce the waste water or leachate problems which can often be associated with ash lagoons.
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