Refining device

A refining device comprising:

• a casing having a charging port and a discharge port of a raw material;
• a rotor disposed inside the casing and having
• a rotation shaft,
• a first rotor portion positioned on the charging port side, and
• a second rotor portion positioned on the discharge port side;
• and
• a liner disposed on an inner surface of the casing along an outer periphery of the rotor, wherein
• the first rotor portion has a plurality of first blades radially installed around the rotation shaft,
• the second rotor portion has a plurality of second blades radially installed around the rotation shaft,
• in a state where the rotor is rotating, the raw material charged from the charging port is refined when sequentially passing between the liner and an end portion on an outer peripheral side of each of the plurality of first blades and between the liner and an end portion on an outer peripheral side of each of the plurality of second blades, and the raw material is discharged from the discharge port, and
• D1>D2, where a separation distance between the liner and the end portion on the outer peripheral side of each of the plurality of first blades is D1, and a separation distance between the liner and the end portion on the outer peripheral side of each of the plurality of second blades is D2.