Title:
METHOD FOR CRYSTALLIZING GYPSUM
Document Type and Number:
WIPO Patent Application WO/2023/032232
Kind Code:
A1
Abstract:
In the present invention, gypsum granules obtained by crashing and then calcining a waste gypsum board are mixed with water to prepare a gypsum slurry, and gypsum particles are precipitated from the gypsum slurry in a crystallization tank. Heated steam is blown into the gypsum slurry at a height down to the upper 1/5 of the crystallization tank from the liquid surface of the gypsum slurry to heat the gypsum slurry and eliminate foam on the liquid surface of the gypsum slurry.
Inventors:
HIRANAKA SHINGO (JP)
Application Number:
PCT/JP2021/040096
Publication Date:
March 09, 2023
Filing Date:
October 29, 2021
Export Citation:
Assignee:
TOKUYAMA CORP (JP)
International Classes:
C01F11/46; B09B3/40; B09B5/00; C04B11/26
Domestic Patent References:
| WO2014141926A1 | 2014-09-18 | |||
| WO2012176688A1 | 2012-12-27 |
Foreign References:
| JP2020114790A | 2020-07-30 | |||
| JP2020065965A | 2020-04-30 | |||
| JPS5043096A | 1975-04-18 | |||
| JP2015051920A | 2015-03-19 | |||
| JP2014088312A | 2014-05-15 | |||
| JP2008081329A | 2008-04-10 |
Other References:
See also references of EP 4166502A4
Attorney, Agent or Firm:
SHIOIRI Akira et al. (JP)
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