Method of and apparatus for discharging sedimentary solid particles
AssigneeKawasaki Steel Corporation
InventorsMasahiro Yoshioka, Masahiko Ito, Mitsuru Sakuta, Makoto Suzuki, Masaharu Ikeda
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Abstract
The present invention provides a method of and an apparatus for efficiently and economically discharging solid particles, which have sedimented on the bottom of a tank, out from the tank. A liquid is ejected from an ejector installed in the tank to move the sedimented solid particles to a predetermined place from which the sedimented solid particles are discharged out from the tank. Further, a solution which contains sedimentary solid particles is cooled and the solid particles are efficiently separated by a solid-liquid separator.
Claims23
A method for preventing particles from accumulating in a tank, used for pickling or plating metallic materials, which comprises at least one ejector and which can hold sedimentary solid particles on a bottom of the tank and a first solution, the method comprising:
- ejecting a liquid from the at least one ejector into the sedimentary solid particle on the bottom of the tank, so as to move the sedimentary solid particles to a predetermined place from which the sedimentary solid particles can be discharged out of the tank;
- discharging from the tank a second solution containing at least one of the sedimentary solid particles;
- cooling the second solution to a temperature below a temperature of the first solution and below 40 degrees centigrade to precipitate solid particles from of the second solution;
- and
- separating at least one solid particle from the second solution.
A method for preventing particles from accumulating in a tank, which comprises at least one ejector and which can hold sedimentary solid particles on a bottom of the tank and a first solution, the method comprising:
- ejecting a liquid from the at least one ejector into the sedimentary solid particles on the bottom of the tank, so as to move the sedimentary solid particles to a discharging place;
- wherein the liquid is ejected in sequence from a plurality of ejectors installed in the tank, beginning with the ejector which is disposed far from the discharging place;
- the tank has an approximately rectangular horizontal section;
- and
- said method further comprises steps of:
- disposing the plurality of ejectors on both side walls of the tank along a long direction of the tank so that the plurality of ejectors are nearly parallel;
- ejecting a liquid in an operation (I) from at least one of the plurality of ejectors (A) on one side of the tank toward sedimentary solid particles which exist in an effective ejection range of the ejectors (A) so as to move at least a part of said particles to within an effective ejection range of at least one of the plurality of ejectors (B) on another side of the tank;
- and
- ejecting a liquid in an operation (II), immediately after or a predetermined time after the ejection of the liquid in the step (I) has substantially been completed, from at least one of the ejectors (B) on the other side of the tank toward the sedimentary solid particles which have been moved into the effective ejection range of the ejectors (B) by the operation (I) so as to move at least a part of said particles,
- thereby moving the sedimentary solid particles toward the discharging place provided in the tank.
An apparatus for discharging sedimentary solid particles existing on a bottom of a tank, used in processes for pickling or plating metallic materials, which holds a first solution wherein solid particles are present, said apparatus comprising:
- at least one ejector which is installed in the tank and which ejects a liquid to the sedimentary solid particles on the bottom of the tank to move the solid particles to a discharging place;
- a device for discharging the sedimentary solid particles, which have been collected in the discharging place, out from the tank;
- a controller for ejecting the liquid through the ejector at a desired time;
- a solid-liquid separator for separating solid particles from a second solution which has been discharged from the tank;
- and
- a heat exchanger for cooling the second solution below 40 degrees centigrade to precipitate solid particles from said second liquid.
Dependencies are inferred from the claim text.