Device and method for reducing water content of acidic gypsum waste residues

The invention discloses a device and a method for reducing the water content of acidic gypsum waste residues, and belongs to the technical field of wastewater treatment. The device comprises a wastewater reaction tank, a cyclone separator, a vacuum suction filter, an inclined tube precipitator and a thick slurry precipitation tank. An outlet of the wastewater reaction tank is connected with an inlet of the cyclone separator, a first outlet of the cyclone separator is connected with a first inlet of the vacuum suction filter, a second outlet of the cyclone separator is connected with a first inlet of the inclined tube precipitator, supernatant is discharged from a first outlet of the inclined tube precipitator, a second outlet of the inclined tube precipitator is connected with an inlet of the thick slurry precipitation tank, an outlet of the thick slurry precipitation tank is connected with a second inlet of the vacuum suction filter, a first outlet of the vacuum suction filter is connected with a second inle