WO 2018/033491 A1

Two-stage calcination process and plant therefor

(22) 11.08.2017

(43) 22.02.2018

(57) Process and plant for the calcination of gypsum in a two-stage process. Provided are a first stage (3) comprising a flash calcination and a second stage for final calcination in a reaction vessel (6). The gypsum is passed from the first stage to the second stage via a transfer conduit (4). According to the invention, the reaction vessel (6) of the second stage is indirectly heated (65), and water vapor is also recirculated in the second stage without supplying external vapor and/or water. The expelled water of crystallization from the second stage provides an autonomous supply of water vapor which, via a circulation system (7), may be fully utilized for supplying the second stage with the required water vapor. Thus, a high water vapor proportion may be maintained in the second calcination stage with no need for a separate vapor generation. Accordingly, little, if any, anhydrite is formed. The invention accordingly combines low (…).

(71) Claudius Peters Projects GmbH, Schanzenstraße 40, 21601 Buxtehude (DE)

x

Related articles:

Issue 2018-9 WO 2018/091062 A1

Process and apparatus for calcination of gypsum

(22) 18.11.2016 (43) 24.05.2018 (57) The invention pertains to a process for modifying gypsum, wherein a continuous feed of raw gypsum is provided; the water content of the raw gypsum is determined in...

more
Issue 2018-11 EP3365298 (A1)

Water-resistant gypsum products and methods

(22) 13.10.2016 (43) 29.08.2018 (57) Summary of the corresponding patent US2017107151 (A1): This invention relates to water-resistant gypsum products manufactured with water-based emulsions comprising...

more
Issue 2018-11 EP3368492 (A1)

Method for producing a cement clinker substitute which is made primarily of calcined clay

(22) 21.10.2016 (43) 05.09.2018 (57) Summary of the corresponding patent WO2017072047 (A1): This invention relates to water-resistant gypsum products manufactured with water-based emulsions comprising...

more
Issue 2020-5-6 AU2018303666 (A1)

Gypsum composition comprising uncooked starch having mid-range viscosity, and methods and products related thereto

(22) 18.07.2018 (43) 20.02.2020 (57) Disclosed is a gypsum board comprising a set gypsum core disposed between two cover sheets, the core formed from a slurry comprising stucco, water, and at least...

more
Issue 2019-12 EP3541765 (A1)

Process and apparatus for calcination of gypsum

(22) 18.11.2016 (43) 25.09.2019 (57) Summary of the corresponding patent WO2018091062 (A1): The invention pertains to a process for modifying gypsum, wherein a continuous feed of raw gypsum is...

more