Dissolution of a raw material, fusion of a raw material, or treatment for
enhancing the fluidity of a raw material is completed in a short time by
an agitation mixer 10 comprising a casing 20 in which a flow channel
allowing the passage of fluid is mounted inside, an agitator body 40
mounted inside the casing and connected to a vibration source 46, a
material inlet 12 mounted on the lowermost part of the casing 20 to feed
the raw material into the casing 20, and a steam feeder 30 for injecting
steam into the inside of the casing 20. Agitation chambers 26 divided by
partition plates 24 are formed in the casing 20. A pressure gage 32 for
measuring injection pressure of the steam is attached to the steam feeder
30. An outlet 14 is mounted on the uppermost part of the casing 20 to
eject the raw material after the raw material is treated. Further, one of
the agitation chambers 26 to which the outlet 14 is mounted includes a
filter 50 placed so as to surround the agitator body 40.