Device for dissolving a coagulant

A device for dissolving a coagulant in which the coagulant is gelled by adding water comprising:

• a rotor chamber;
• a coagulant feed section for feeding powdery coagulant to the rotor chamber, the coagulant feed section comprising a hopper having an inlet and outlet and an axis therebetween, a screw feeder provided at the outlet of the hopper, and a coagulant feed passage for connecting the screw extrusion to the rotor chamber;
• a hot air blowoff section provided in the hopper for driving the coagulant in the hopper;
• an air blowoff section provided in the coagulant feed passage for forming an air curtain in the coagulant feed passage, said air curtain formed in a direction traversing the axis of the coagulant feed passage, said air curtain formed to prevent water vapor in the rotor chamber from entering into the screw feeder;
• and
• a hot air blowoff section provided in the coagulant feed passage for diffusing coagulant moving in the coagulant feed passage within the coagulant feed passage;
• a plurality of rotors supported within the rotor chamber along a horizontal plane, each of said rotors rotatable about a respective axis such that a mixture of coagulant and water are directed by said rotors along a dissolving flow direction within said rotor chamber, at least one of said rotors having a hampering plate associated therewith, said hampering plate having protrusions projecting in the flow direction of the mixture;
• means for feeding a mixture of the coagulant and water to the rotor chamber;
• means for keeping a level of the mixture at a midpoint of the rotors, the rotors being adapted to stir the mixture in the vertical direction by the rotation of the rotors;
• and
• a heater around said rotor chamber.