Classifying – separating – and assorting solids – Sifting – Feeding
Patent
1996-05-13
1998-11-17
Bollinger, David H.
Classifying, separating, and assorting solids
Sifting
Feeding
209270, 209284, 209288, B07B 122
Patent
active
058364560
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a discrete material washing apparatus for the separation of a cementacious mixture, for example unused fluent concrete, into its original constituent parts and the removal of cementations water for disposal or to be recycled into future concrete batch production.
Fluent concrete made from mixing primarily, but not only, sand, stone aggregate and water is normally delivered in a mobile concrete mixer from a depot to a site for discharge, the mixer during travel and until the fluent concrete is discharged being rotated to keep the mixture from setting. On occasions, not all fluent concrete is discharged and is brought back in the mixer to be dumped at or near to a depot or other site. After all the fluent concrete is discharged, the mixer is partially filled with water to wash out the mixer ready for re-use. The washouts are also dumped.
Problems have occured due to the unenvironmentally-friendly disposal of unused fluent concrete or concrete mixer washouts which can cause highly alkaline, cementatious water to enter into surface and underground watercourses. European legislation is being proposed to prohibit such disposal.
It is an object of the present invention to provide an environmentally-friendly reclamation procedure which would meet the provisions of the proposed European legislation concerning disposal of cementations mixture and water thereby eliminating unsightly concrete dump sites and contamination of watercourses, the procedure involving reclamation of the original constitutent solid parts of the fluent concrete, ie. sand and aggregate, and the cementations water for recycling.
Accordingly, the present invention is a discrete material washing apparatus comprising a structure mounting an elongate trough having an inlet and an outlet, a dished tray mounted on the structure and shaped to feed into the inlet, the tray being to receive disposal of a cementations mixture therein, a cylindrical screen having a net surface, the screen extending substantially along the length of the trough and adapted for rotation, water spray means being provided to play on any mixture disposed onto the tray and passed through the inlet into the interior of the screen for size classification with smaller particles able to pass through the mesh of the screen surface into the trough and larger particles remaining in the screen, first means to remove the smaller particles from the trough, second means to remove the larger particles from the interior of the screen through the outlet of the trough, weir means in at least one longitudinal side for removal of the cementations water from the trough, and power means to rotate the screen and operate the first and second removal means.
Preferably, gate means are provided for operation to close off the inlet of the trough, the gate means being operable responsive to a pressure monitoring device surveying throughput of mixture into the screen.
The screen is preferably provided internally of its surface with a series of helically arranged deflector elements which act as a means to convey the larger particles along the screen from the inlet end to the discharge end during rotation of the screen. At the outlet end of the screen, a series of radial collector attachments are desirably secured thereto to collect the larger particles delivered by the deflector elements, rotation of the screen causing any particles on the collector attachments to be deposited sequentially on the second removal means as each attachment passes thereover for removal of the larger particles from the screen. An archimedean attachment is preferably fitted exteriorly of the screen to moved the smaller particles deposited on the bottom of the trough towards the first removal means as the screen is rotated.
Preferably also, the tray has an upstanding lip and is provided with a series of water discharge nozzles connected to a supply of water, the sprayed water being to aid in the movement of the cementations mixture. Water spraying means are provided externally of the screen to play onto th
REFERENCES:
patent: 2228185 (1941-01-01), Thompson
patent: 3278022 (1966-10-01), Moeschler
patent: 4127478 (1978-11-01), Miller
patent: 5082553 (1992-01-01), Tanii
patent: 5248042 (1993-09-01), Kuhmonen
patent: 5427250 (1995-06-01), Page et al.
Lappin Thomas James
Pickering Robert Leslie
Bollinger David H.
Greigg Edwin E.
Greigg Ronald E.
Rapid International Limited
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