| 摘要 |
The present invention discloses, in certain embodiments, a method for treating a concrete slurry to recover constituents thereof, the constituents including water, coarse aggregate, fine aggregate, and cement solids, the method comprising removing aggregate from the concrete slurry with aggregate separation apparatus, the aggregate separation apparatus producing a secondary slurry containing cement solids, feeding the secondary slurry to a clarifier in which cement solids settle out from the secondary slurry to a bottom of the clarifier and a liquid which is primarily water is disposed above the cement solids, removing the liquid from the clarifier, feeding settled out cement solids in liquid from the clarifier to a centrifuge, separating settled out cement solids from the liquid in the centrifuge producing an amount of liquid and an amount of settled out cement solids with liquid. In one aspect the settled out cement solids in liquid fed from the clarifier to the centrifuge comprise at most about 20% of the secondary slurry fed to the clarifier. In one aspect a dewatered cement paste is produced which is at most about 60% water by weight. The present invention discloses recovered cement solids recovered by methods according to the present invention.
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