Concrete reclamation system

Details Concrete reclamation system Concrete reclamation system

1997-04-21

1998-11-10

Woo, Jay H.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210723, 210724, 210738, 210781, 210787, 210804, C02F 138

Patent

active

058338632

ABSTRACT:
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.

REFERENCES:
patent: 4548507 (1985-10-01), Mathis et al.
patent: 5149192 (1992-09-01), Hamm et al.
patent: 5268111 (1993-12-01), Metz et al.
patent: 5492620 (1996-02-01), Evans
patent: 5685978 (1997-11-01), Petrick et al.
patent: 5699969 (1997-12-01), Isaji
Phoenix Process Equipment Co., "High Rate Thickener" brochure.
HS-3400 Decanting Centrifuge, The Brandt Co., 1995.
SDW-25 System, Brandt/EPI, 1995 (ignore X's on back side).
Vacuum Assisted Cyclone Separator, Brandt/EPI, 1996.
Reclaim lost Concrete material profits, The Vince Hagar Co., 1995.
Redi-Claim, Jadair Inc., 1995.
The Time Machine For Concrete, Rapid Int'l. Ltd., 1995.
Concrete Reclaimer, Rapid Int'l. Ltd., 1995.
We Will Put Out Money Where Our Mouth Is, Henry Mfg. Co., 1995.
Readymix Reclaim System Model 604, Linatex Corp. of America, 1990.
Type TK Automatic High-Speed Filter Press for Ready-Mixed Concrete Plants, Onoda Corp., 1995.
U.S Official Gazette--Patents--entries for U.S. 5,641,397; 24 Jun. 1997, U.S. 5,641,249; 24 Jun. 1997, U.S. 5,641,071; 24 Jun. 1997.

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