A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Chlorellestadite in the preheater system of cement kilns as an indicator of HCl formation
AbstractThe conditions leading to the formation of water-insoluble chlorellestadite, ideal formula (unit cell content) Ca10(SiO4)3(SO4)3Cl2, 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 (CuKα1). Crystal data: hexagonal, space group P63/m, a=9.6773(3) Å, c=6.8585(1) Å, Z=1. A disordered S/Si distribution was observed.
Chlorellestadite in the preheater system of cement kilns as an indicator of HCl formation
AbstractThe conditions leading to the formation of water-insoluble chlorellestadite, ideal formula (unit cell content) Ca10(SiO4)3(SO4)3Cl2, 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 (CuKα1). Crystal data: hexagonal, space group P63/m, a=9.6773(3) Å, c=6.8585(1) Å, Z=1. A disordered S/Si distribution was observed.
Chlorellestadite in the preheater system of cement kilns as an indicator of HCl formation
Saint-Jean, Simon Jegou (author) / Jøns, Ebbe (author) / Lundgaard, Niels (author) / Hansen, Staffan (author)
Cement and Concrete Research ; 35 ; 431-437
2004-05-17
7 pages
Article (Journal)
Electronic Resource
English
Chlorellestadite in the preheater system of cement kilns as an indicator of HCl formation
| Online Contents | 2005
Chlorellestadite in the preheater system of cement kilns as an indicator of HCl formation
| British Library Online Contents | 2005
Alkali problem in suspension preheater kilns
| Engineering Index Backfile | 1962