| 摘要 |
PURPOSE:To enable the recovery and reuse of a deposited salt and to reduce the waste water treating capacity by providing a washing vessel using a solvent not disolving the salt in the rear stage of a plating bath, spraying the solvent onto the surface of a band steel, and separating the salt from the solvent after washing by gravity. CONSTITUTION:A solvent such as benzene and toluene stored in a solvent tank 36, not dissolving the salt, and having the b.p. lower than the temp. of the band steel 22 immediately after plating is sprayed from a nozzle 35 onto the band steel 2 entering the solvent washing vessel 34 from the plating bath 26. The sprayed solvent is vaporized on the surface of the band steel 22, the salt deposited on the surface of the band steel 22 is washed and removed by the expansion of the vapor, and the solvent flows down along with the salt into a separator 37. The vaporized solvent is cooled and condensed, and the condensate is returned to the tank 36. The salt and the solvent are separated by gravity in the separator 37, the salt is returned to the plating bath 26, and the solvent is returned to the tank 36.
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