Title:
METHOD FOR TREATING WASTE GYPSUM BOARD AND FLUID TANK TYPE CALCINATION DEVICE USED THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/032235
Kind Code:
A1
Abstract:
The present invention calcines gypsum granular bodies obtained by pulverizing a waste gypsum board and changes same to hemihydrate gypsum and/or anhydrite type III. Gypsum granular bodies are fed into a fluid tank from a feeding port to the fluid tank of a calcination device by a feeding device, and gypsum granular bodies after calcination are discharged from a discharging port from the fluid tank by a discharging device. The amount of gypsum granular bodies inside the fluid tank is kept within a predetermined range by controlling the feeding device and the discharging device. The calcination device can be steadily operated with a small production amount of anhydrite type II.
Inventors:
HIRANAKA SHINGO (JP)
Application Number:
PCT/JP2021/041843
Publication Date:
March 09, 2023
Filing Date:
November 15, 2021
Export Citation:
Assignee:
TOKUYAMA CORP (JP)
International Classes:
B09B3/20; C01F11/46
Domestic Patent References:
| WO2012176688A1 | 2012-12-27 | |||
| WO2012176688A1 | 2012-12-27 |
Foreign References:
| JPS557599A | 1980-01-19 | |||
| JP2006511419A | 2006-04-06 | |||
| US4974334A | 1990-12-04 | |||
| JPH0238347A | 1990-02-07 | |||
| JP2016155725A | 2016-09-01 |
Attorney, Agent or Firm:
SHIOIRI Akira et al. (JP)
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