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Influence of temperature, particle size and humidity on the gypsum dehydration process. Investigations in a Cahn-thermobalance

Stenström, Stig LU (1992) In Zement-Kalk-Gips 45(9). p.478-482
Abstract
The aim of the present work was to compare natural and chemical gypsums with respect to dehydration rate and to investigate the influence of air temperature, particle size and air humidity. No difference in calcination rate could be observed between natural and FGD-gypsum. However the small samples did not permit tests of setting times or simulation of the mixer behaviour. The calcination rate was shown to decrease by a factor of 2 for particle sizes from 40 mum to 500 mum. However over the range 40-150 mum of interest in commercial units the decrease was only 20%. For FGD-gypsum the calcination rate was independent of the particle size between 40-100 mum. In this work the humidity has been shown to have a large influence on the formation... (More)
The aim of the present work was to compare natural and chemical gypsums with respect to dehydration rate and to investigate the influence of air temperature, particle size and air humidity. No difference in calcination rate could be observed between natural and FGD-gypsum. However the small samples did not permit tests of setting times or simulation of the mixer behaviour. The calcination rate was shown to decrease by a factor of 2 for particle sizes from 40 mum to 500 mum. However over the range 40-150 mum of interest in commercial units the decrease was only 20%. For FGD-gypsum the calcination rate was independent of the particle size between 40-100 mum. In this work the humidity has been shown to have a large influence on the formation of hemihydrate and anhydrite and the fundamental equations proposed by Kelly have been shown to agree well with the experimental data. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Zement-Kalk-Gips
volume
45
issue
9
pages
478 - 482
publisher
Bauverlag GmbH
external identifiers
  • wos:A1992JU38200009
ISSN
0722-4400
language
English
LU publication?
yes
id
de0a3775-6303-4817-8a1a-e67f8df29cc9 (old id 3914122)
date added to LUP
2013-07-01 10:58:11
date last changed
2016-04-16 05:05:43
@article{de0a3775-6303-4817-8a1a-e67f8df29cc9,
  abstract     = {The aim of the present work was to compare natural and chemical gypsums with respect to dehydration rate and to investigate the influence of air temperature, particle size and air humidity. No difference in calcination rate could be observed between natural and FGD-gypsum. However the small samples did not permit tests of setting times or simulation of the mixer behaviour. The calcination rate was shown to decrease by a factor of 2 for particle sizes from 40 mum to 500 mum. However over the range 40-150 mum of interest in commercial units the decrease was only 20%. For FGD-gypsum the calcination rate was independent of the particle size between 40-100 mum. In this work the humidity has been shown to have a large influence on the formation of hemihydrate and anhydrite and the fundamental equations proposed by Kelly have been shown to agree well with the experimental data.},
  author       = {Stenström, Stig},
  issn         = {0722-4400},
  language     = {eng},
  number       = {9},
  pages        = {478--482},
  publisher    = {Bauverlag GmbH},
  series       = {Zement-Kalk-Gips},
  title        = {Influence of temperature, particle size and humidity on the gypsum dehydration process. Investigations in a Cahn-thermobalance},
  volume       = {45},
  year         = {1992},
}