Chloride salt effects on the decomposition of dolomite

Mao Qiang Li, Gary Lynn Messing

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

A great deal of variability in decomposition temperature(s), activation energy and rate of decomposition exists in the literature on the decomposition of dolomite. Although differences may be due to experimental factors such as sample size, grain size, heating rate and atmospheric conditions, it has been found that the presence of small concentrations of alkali or alkaline earth salts in the naturally occurring minerals has a strong effect on their decomposition. From DTA and isothermal studies, it is illustrated that the temperature of decomposition of dolomite is reduced and that the rate of decomposition is enhanced relative to pure dolomite when small amounts of chloride salts such as LiCl, NaCl, MgCl2 and CaCl2 are added. From X-ray analysis, pure dolomite is seen to decompose directly into CaO and MgO, but when chlorides are present it initially decomposes into MgO and CaCO3. The decomposition reaction for both pure dolomite and dolomite containing chlorides follows the contracting-area model 1 - (l - α) 1 2= kt Activation energies for pure and doped dolomites have been evaluated and are similar to those reported in literature.

Original languageEnglish (US)
Pages (from-to)1-8
Number of pages8
JournalThermochimica Acta
Volume68
Issue number1
DOIs
StatePublished - Sep 15 1983

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Chlorides
Salts
chlorides
salts
Decomposition
decomposition
Activation energy
activation energy
Magnesium Chloride
X ray analysis
Alkalies
meteorology
dolomite
Heating rate
Differential thermal analysis
Minerals
alkalies
thermal analysis
grain size
Earth (planet)

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

Cite this

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Chloride salt effects on the decomposition of dolomite. / Li, Mao Qiang; Messing, Gary Lynn.

In: Thermochimica Acta, Vol. 68, No. 1, 15.09.1983, p. 1-8.

Research output: Contribution to journalArticle

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