WO 2021/120705 A1

Method for preparing α-hemihydrate gypsum

(22) 07.09.2020

(43) 24.06.2021

(57) Disclosed is a method for preparing α-hemihydrate gypsum, the method involving using citric acid as a crystal transformation agent to prepare dihydrate gypsum, and then subjecting the dihydrate gypsum to crystal transformation under the excitation effect of an α-hemihydrate gypsum seed to prepare α50 grade α -hemihydrate gypsum meeting the standard specification of JC/T 2038-2010.

(71) Jiangsu Efful Science and Technology Co., Ltd, Jiangsu 211178 (CN)

x

Related articles:

Issue 2017-5 WO 2017/045519 A1

Method for producing wet-process phosphoric acid and ­byproducing alpha-hemihydrate gypsum and high-purity and high-whiteness alpha-hemihydrate gypsum

(22) 26.08.2016 (43) 23.03.2017 (57) Provided is a method for producing wet-process phosphoric acid and by-producing alpha-hemihydrate gypsum and high-purity and high-whiteness alpha-hemihydrate...

more
Issue 2020-9 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...

more
Issue 2021-6 WO 2021/001781 A1

Clinker

(22) 02.07.2020 (43) 07.01.2021 (57) The present invention relates to clinker, in particular cement clinker. The invention provides a method of preparing clinker and extends to clinker prepared in...

more
Issue 2019-1-2 US 2018/0305257 A1

Gypsum set accelerator and method of preparing same

(22) 12.03.2018 (43) 25.10.2018 (57) A modified gypsum set accelerator and a method of preparing the same is provided, which includes dry loose finely ground particles of a mixture of ground dry...

more
Issue 2016-7-8 WO 2016/073393 A1

Microwave heating for gypsum manufacturing processes

(22) 03.11.2015 (43) 12.05.2016 (57) Methods of making calcium sulfate whiskers are provided. In one aspect, a method includes autoclaving a slurry of calcium sulfate hemihydrate and water to form...

more