Continuous annealing and/or galvanizing unit cleaning section alkali liquor recycling method and device

The invention provides a continuous annealing and/or galvanizing unit cleaning section alkali liquor recycling method and device. The device comprises a magnetic filtering unit, an alkali liquor collecting unit, an alkali liquor sedimentation purification unit and an alkali liquor storage unit; the filtering unit is provided with a magnetic filtering component, a spraying component and a scraping component; the collecting unit collects alkali liquor or demineralized water sprayed out of the spraying component; the purification unit receives alkali liquor flown out of a first overflow component; the purification unit comprises two or more stages of sedimentation chambers which are arranged in the flowing direction of alkali liquor; the storage unit is communicated with the last stage of sedimentation chamber of the purification unit; the alkali liquor cleanness degree can be improved, strip steel cleaning, brushing and electrolysis quality can be ensured, the maintaining frequency of rollers of the whole line