US 2020/0123055 A1

Recycling method of dihydrate gypsum from waste gypsum boards

(22) 22.10.2019

(43) 23.04.2020

(57) Gypsum derived from waste gypsum boards is calcined and converted into gypsum granules including hemihydrate and/ or anhydrous type III gypsum. The calcined gypsum granules are dropped into water to prepare a gypsum slurry. Then, dihydrate gypsum particles are crystalized in the slurry. The temperature of the gypsum granules just before being dropped into the water is 90° C or higher.

(71) Tokuyama Corporation, Shunan-shi (JP)

Issue 05/2024 EP 4371941 A1

Manufacturing method of gypsum by using biosulfur and oxidation

(22) 14.10.2022 (43) 22.05.2024 (57) A method for manufacturing gypsum containing a high content of one or more of hemihydrate gypsum, dihydrate gypsum, and anhydrous gypsum using an oxidation...

Issue 4/2023 EP 4 166 502 A1

Method for crystallizing gypsum

(22) 29.10.2021 (43) 19.04.2023 (57) Wasted gypsum boards are crushed and calcined to gypsum granular solid, and the gypsum granular solid is mixed with water to form gypsum slurry. Gypsum particles...

Issue 9/2020 ONESTONE CONSULTING LTD.

Outlook on the gypsum industry

1 Introduction OneStone Consulting Ltd. published a new market report with the title Gypsum Industry Focus 2030 [1]. In this multi-client market study, a breakdown of the global gypsum industry is...

Issue 4/2019 US 2019/0016633 A1

Calcined gypsum treatment device and calcined gypsum treatment method

(22) 31.01.2017 (43) 17.01.2019 (57) A calcined gypsum treatment apparatus has an agitating type of cooler provided with a cooling region for cooling the calcined gypsum, and a moisture supplying...

Issue 6/2022 US 2022/0184848 A1

Pretreatment mixing and stirring device, gypsum slurry manufacturing apparatus, building board manufacturing apparatus, pretreatment calcined gypsum manufacturing method, gypsum slurry manufacturing method, building board manufacturing method

(22) 14.04.2020 (43) 16.06.2022 (57) A pretreatment mixing and stirring device, arranged at a stage prior to a slurry formation mixing and stirring device which forms a gypsum slurry by kneading a...

ZKG 9/2020