Travelling doctor blade with nozzle

Liquid purification or separation – Processes – Separating

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Details

210797, 210396, 210402, 210408, B01D 3306

Patent

active

054075874

ABSTRACT:
A method and apparatus for removing solids from the porous surface of a rotating vacuum drum. Such drums are used to separate the solid and liquid phases of a slurry, such as a calcium carbonate containing mud slurry. Doctor blades are often used to scrape the drum exterior surface of excess mud to minimize the build up of solids thereon. Nonetheless a cake eventually forms on the drum and clogs the porous surface and stops the vacuum action. The drum is stopped and the drum backwashed by water to dislodge the cake. According to this invention, a jet of water from a nozzle is substantially tangentially directed against the drum surface to thereby eliminate stopping the drum for cake dislodgement. The nozzle is located beneath and moves with a reciprocating secondary doctor blade, the secondary doctor blade being of a length less than the width of the drum. A stationary, main doctor blade spans the entire width of the drum. The nozzle directs the water jet tangentially against that drum surface area scraped by the reciprocating secondary doctor blade and above the main doctor blade. The water jet slightly breaks the vacuum within the drum, but this partial loss has no negative effect on the operation. With the use of this invention, no stoppage of the separating process for backwashing is required.

REFERENCES:
patent: 793720 (1905-07-01), Godbe
patent: 1627882 (1927-05-01), Berry
patent: 2027652 (1936-01-01), Raisch
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patent: 2070074 (1937-02-01), Young
patent: 2363840 (1944-11-01), Denard
patent: 2395098 (1946-02-01), Butler
patent: 3075646 (1963-01-01), Giesse
patent: 3521751 (1970-07-01), Holthuis
patent: 4261831 (1981-04-01), Linsenmeyer
patent: 4750340 (1988-01-01), Anderson
patent: 5143555 (1992-09-01), Brady
patent: 5149448 (1992-09-01), Mattelmaki

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