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 the continuous feed by near infrared spectroscopy (NIR) measurement; the raw gypsum is calcined in a calcination unit at a fire rate to remove water from the raw gypsum and to obtain a continuous feed of calcined gypsum having a water content within a selected range; a water content of the calcined gypsum is determined by near infrared spectroscopy, and the fire rate is adjusted based on the water content of the raw gypsum and of the calcined gypsum. Further, the invention pertains to an apparatus for performing said process.

(71) Knauf Gips KG, Am Bahnhof 7, 97346 Iphofen (DE)

(84) ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)

x

Related articles:

Issue 12/2019 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
Issue 7-8/2020 US 2020/0109086 A1

Method for manufacturing cement

(22) 28.05.2018 (43) 09.04.2020 (57) The present invention pertains to a method for manufacturing cement, wherein the gypsum is first calcined separately before being inter-grinded with the clinker so...

more
Issue 11/2014 GEBR. PFEIFFER SE

Grinding and calcining of gypsum with Pfeiffer grinding plants

When gypsum is calcined in an atmosphere sat­urated with water vapour at an overpressure of several bars, a-hemihydrate is formed (Fig. 1). The outstanding feature of this plaster is a relatively...

more
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...

more
Issue 11/2018 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