System and a method for dispersing by circulation

A system for dispersing by circulating a slurry or liquid mixture to disperse substances in the mixture, the system comprising:

• a rotating and continuously dispersing device that disperses the mixture;
• a tank that is connected to an outlet of the dispersing device;
• a circulating pump that circulates the mixture;
• and
• a piping that in series connects the dispersing device, the tank, and the circulating pump;
• wherein an outflow of the mixture from the dispersing device is greater than an inflow into the dispersing device so that an amount of the mixture in the dispersing device is maintained at a level where a part for sealing a shaft that is provided inside the dispersing device is not immersed,
• wherein the dispersing device has a pair of rotors,
• wherein the mixture flows through a hollow shaft to a gap between the pair of rotors,
• wherein the mixture is dispersed when it is radially and outwardly discharged from outer circumferences of the rotors through the gap between the pair of rotors, and
• wherein the system further comprises a driving mechanism that drives at least one of the pair of rotors to approach, or retract from, each other.