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Chlorellestadite in the preheater system of cement kilns as an indicator of HCl formation

Jegou Saint-Jean, Simon LU ; Jons, E; Lundgaard, N and Hansen, Staffan LU (2005) In Cement and Concrete Research 35(3). p.431-437
Abstract
The conditions leading to the formation of water-insoluble chlorellestadite, ideal formula (unit cell content) Ca-10(SiO4)(3)O-2, instead of water-soluble KCl and NaCl in Portland cement kiln systems were investigated by quantitative X-ray phase analysis of plant samples, preparation of pure chlorellestadite, and thermodynamic calculations. The results support the view that water-insoluble chloride is present as chlorellestadite. A reason for its occurrence could be poor contact between the hot kiln gases and lime-containing dust causing formation of gaseous HCl, which then produces chlorellestadite in contact with the hot meal in the preheater unit. The structure model for synthetic chlorellestadite, used in the quantitative X-ray phase... (More)
The conditions leading to the formation of water-insoluble chlorellestadite, ideal formula (unit cell content) Ca-10(SiO4)(3)O-2, instead of water-soluble KCl and NaCl in Portland cement kiln systems were investigated by quantitative X-ray phase analysis of plant samples, preparation of pure chlorellestadite, and thermodynamic calculations. The results support the view that water-insoluble chloride is present as chlorellestadite. A reason for its occurrence could be poor contact between the hot kiln gases and lime-containing dust causing formation of gaseous HCl, which then produces chlorellestadite in contact with the hot meal in the preheater unit. The structure model for synthetic chlorellestadite, used in the quantitative X-ray phase analysis, was refined by the full profile Rietveld method using the powder X-ray diffraction spectrum (CuKalpha 1). Crystal data: hexagonal, space group P6(3)/M, a = 9.6773(3) angstrom, c = 6.8585(1) angstrom, Z = 1. A disordered S/Si distribution was observed. (c) 2004 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
X-ray diffraction, Chloride, Cement manufacture, Modelling
in
Cement and Concrete Research
volume
35
issue
3
pages
431 - 437
publisher
Elsevier
external identifiers
  • wos:000227638100001
  • scopus:13844280460
ISSN
0008-8846
DOI
10.1016/j.cemconres.2004.05.028
language
English
LU publication?
yes
id
874345f7-e2ea-424e-ae13-57e29ea8789f (old id 152218)
date added to LUP
2007-07-13 15:49:34
date last changed
2017-01-01 06:53:31
@article{874345f7-e2ea-424e-ae13-57e29ea8789f,
  abstract     = {The conditions leading to the formation of water-insoluble chlorellestadite, ideal formula (unit cell content) Ca-10(SiO4)(3)O-2, instead of water-soluble KCl and NaCl in Portland cement kiln systems were investigated by quantitative X-ray phase analysis of plant samples, preparation of pure chlorellestadite, and thermodynamic calculations. The results support the view that water-insoluble chloride is present as chlorellestadite. A reason for its occurrence could be poor contact between the hot kiln gases and lime-containing dust causing formation of gaseous HCl, which then produces chlorellestadite in contact with the hot meal in the preheater unit. The structure model for synthetic chlorellestadite, used in the quantitative X-ray phase analysis, was refined by the full profile Rietveld method using the powder X-ray diffraction spectrum (CuKalpha 1). Crystal data: hexagonal, space group P6(3)/M, a = 9.6773(3) angstrom, c = 6.8585(1) angstrom, Z = 1. A disordered S/Si distribution was observed. (c) 2004 Elsevier Ltd. All rights reserved.},
  author       = {Jegou Saint-Jean, Simon and Jons, E and Lundgaard, N and Hansen, Staffan},
  issn         = {0008-8846},
  keyword      = {X-ray diffraction,Chloride,Cement manufacture,Modelling},
  language     = {eng},
  number       = {3},
  pages        = {431--437},
  publisher    = {Elsevier},
  series       = {Cement and Concrete Research},
  title        = {Chlorellestadite in the preheater system of cement kilns as an indicator of HCl formation},
  url          = {http://dx.doi.org/10.1016/j.cemconres.2004.05.028},
  volume       = {35},
  year         = {2005},
}