Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1997-05-19
1998-12-29
Hruskoci, Peter A.
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
134 13, 134 2218, 134108, 134167R, 210737, 210803, 210167, 210181, 210523, B01D 2124
Patent
active
058535977
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/JP96/02780 filed Sep. 26, 1996, published as WO97/12077 Apr. 3, 1997.
FIELD OF THE INVENTION
The present invention relates to a method of and an apparatus for preventing sludge or other solid particles from piling up in a pickling tank, a circulating tank, plating tank, or other equipment for pickling or plating metallic materials and also for efficiently discharging such solid particles out of the tanks.
RELATED ART
In general, when pickling metallic materials, surface scales and a compound composed of metal and an acid solution turn into sludge which sometimes accumulates in a pickling tank and a circulating tank which is installed as necessary. Especially when steel materials made of stainless steel or the like is treated with a pickling solution which contains hydrofluoric acid, the sludge solidifies in a tank, requiring a great deal of labor and time (see Japanese Patent Publication No. 55-2476) for cleaning the tank to remove the solidified sludge. Such cleaning is possible only after the operation is shut down and it has to be done by "human-wave tactics."
There have been known the following methods to remove the sludge which has accumulated on the bottom of a tank during operation: a method in which a screw conveyor is employed (see Japanese Patent Laid-Open No. 58-55012); a method in which sludge is scraped to a pit groove provided on one end of a tank by feeding members mounted on two endless chains (see Japanese Unexamined Utility Model Publication No. 55-53508); and a method in which a scraper is used in a pickling tank, and a sedimentation tank is provided (see Japanese Patent Publication No. 2-10874). None of these methods, however, disclose or suggest the present invention which will be set forth below.
The applicants of the present invention have proposed a method in Japanese Patent Laid-Open No. 7-90659 wherein a pickling solution is ejected from an ejector which is installed on the bottom of a pickling tank for pickling metallic materials and from an ejector installed on the bottom of a circulating tank, if any, so as to suspend the sludge in the pickling solution to prevent it from sedimenting in the aforesaid tanks. A part of the pickling solution which contains the suspended sludge is separated into solid and liquid by using a solid-liquid separator; the separated liquid which contains substantially no sludge is circulated as the pickling solution and the separated sludge is discharged out of the pickling system.
The method proposed in the foregoing is good as a method for discharging sludge out of the pickling system; a basic idea thereof is to prevent sludge from sedimenting in a tank by ejecting a liquid through an ejector. This method, however, inevitably involves a large pump for frequently ejecting the solution through the ejector and accordingly consumes a relatively large amount of electricity.
It is an object of the present invention to provide a method for efficiently and economically discharging solid particles, which have sedimented on the bottom of a tank, out of the tank.
It is another object of the present invention to provide a method for efficiently and economically discharging sludge out of a pickling tank and a circulating tank used as auxiliary equipment for metallic steel plates such as stainless steel plates.
It is a further object of the present invention to provide a method for efficiently separating sludge, which is generated from pickling a metallic material in a pickling tank, from a pickling solution.
It is yet another object of the present invention to provide an apparatus which can be employed for the foregoing methods.
DISCLOSURE OF THE INVENTION
1) The present invention relates to a discharging method of sedimentary solid particles, whereby sedimentary solid particles lying on the bottom of a tank which contains a solution wherein solid particles are present are moved to a predetermined location by ejecting a liquid to the sedimentary solid particles from at least one ejector which is installed in the tank, and t
REFERENCES:
patent: 4426233 (1984-01-01), Manabe et al.
patent: 4642138 (1987-02-01), Koyase et al.
patent: 4913819 (1990-04-01), Patterson
Ikeda Masaharu
Ito Masahiko
Sakuta Mitsuru
Suzuki Makoto
Yoshioka Masahiro
Hruskoci Peter A.
Kawasaki Steel Corporation
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