| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for production of regenerated particles capable of stably obtaining the regenerated particle which has a low content of hard materials, is easy to slurry, has high whiteness and is excellent in energy efficiency. <P>SOLUTION: The method for production of regenerated particles includes dehydrating and heat-treating a material 10 to be treated. The heat treatment is performed by dividing into: a drying method 60 for drying the material 10 after dehydration; a first heat treatment method 42 for heat-treating the dried material 10; a second heat treatment method 14 for heat-treating the material 10 after the first heat treatment at a temperature exceeding that of the first heat treatment; and a third heat treatment method 32 for heat-treating the material 10 after the second heat treatment at a temperature exceeding that of the second heat treatment. An external heating jacket 43 is provided on the outer surface of a furnace body for the first heat treatment method 42, and hot air is supplied into the external heating jacket 43 to form an external heating furnace. An exhaust gas G7 discharged from the external heating jacket 43 is blown in the furnace body. <P>COPYRIGHT: (C)2012,JPO&INPIT |
