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Calcination kinetics of limestone and the microstructure of nascent CaO

Zhong, Q and Bjerle, Ingemar LU (1993) In Thermochimica Acta 223. p.109-120
Abstract
The calcination kinetics of limestone was investigated by TGA at 600-1000-degrees-C and from 1 mbar to 1 atm. The temperature, total pressure, CO2 partial pressure and particle size affect the calcination rate. Above 90% of calcination efficiency can be reached in less than 2.5 s at 1000-degrees-C and 1 mbar. Under the conditions of eliminating all diffusion resistances, the instantaneous rate of calcination is proportional to the surface area of undecomposed CaCO3, and this process can be described by a shinking core model. The microstructure of nascent CaO that was prepared in an entrained-flow reactor at 1 atm, was studied using the BET method. The BET surface area of the calcines increases with increasing residence time and temperature... (More)
The calcination kinetics of limestone was investigated by TGA at 600-1000-degrees-C and from 1 mbar to 1 atm. The temperature, total pressure, CO2 partial pressure and particle size affect the calcination rate. Above 90% of calcination efficiency can be reached in less than 2.5 s at 1000-degrees-C and 1 mbar. Under the conditions of eliminating all diffusion resistances, the instantaneous rate of calcination is proportional to the surface area of undecomposed CaCO3, and this process can be described by a shinking core model. The microstructure of nascent CaO that was prepared in an entrained-flow reactor at 1 atm, was studied using the BET method. The BET surface area of the calcines increases with increasing residence time and temperature in less than 2 s and below 1000-degrees-C. The largest BET surface area and cumulative pore volume of 2 s nascent CaO are obtained at 1000-degrees-C and 700-degrees-C, respectively. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Thermochimica Acta
volume
223
pages
109 - 120
publisher
Elsevier
external identifiers
  • wos:A1993LX75900013
  • scopus:24044503329
ISSN
0040-6031
DOI
10.1016/0040-6031(93)80125-T
language
English
LU publication?
yes
id
266d9f49-7b3b-4e21-be05-f77de5d8adb0 (old id 3916736)
date added to LUP
2013-07-03 08:59:25
date last changed
2017-10-01 04:37:16
@article{266d9f49-7b3b-4e21-be05-f77de5d8adb0,
  abstract     = {The calcination kinetics of limestone was investigated by TGA at 600-1000-degrees-C and from 1 mbar to 1 atm. The temperature, total pressure, CO2 partial pressure and particle size affect the calcination rate. Above 90% of calcination efficiency can be reached in less than 2.5 s at 1000-degrees-C and 1 mbar. Under the conditions of eliminating all diffusion resistances, the instantaneous rate of calcination is proportional to the surface area of undecomposed CaCO3, and this process can be described by a shinking core model. The microstructure of nascent CaO that was prepared in an entrained-flow reactor at 1 atm, was studied using the BET method. The BET surface area of the calcines increases with increasing residence time and temperature in less than 2 s and below 1000-degrees-C. The largest BET surface area and cumulative pore volume of 2 s nascent CaO are obtained at 1000-degrees-C and 700-degrees-C, respectively.},
  author       = {Zhong, Q and Bjerle, Ingemar},
  issn         = {0040-6031},
  language     = {eng},
  pages        = {109--120},
  publisher    = {Elsevier},
  series       = {Thermochimica Acta},
  title        = {Calcination kinetics of limestone and the microstructure of nascent CaO},
  url          = {http://dx.doi.org/10.1016/0040-6031(93)80125-T},
  volume       = {223},
  year         = {1993},
}