Recent studies on the decomposition of the dolomite group by thermal analysis

Ôtsuka, Ryohei

doi:10.1016/0040-6031(86)87051-4

Cited by 81 publications

(41 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Depending on the experimental conditions, the thermal decomposition can proceed in one endothermic step in air, nitrogen atmosphere, or at CO 2 pressure of less than 150 mm Hg according to equation (the dolomite has a loss of mass of 47.73 %) [2,3,5,11,16,[19][20][21]25]:…”

Section: Introductionmentioning

confidence: 99%

Thermal behavior of natural dolomite

Olszak-Humienik

Jabłoński

2014

J Therm Anal Calorim

128

View full text Add to dashboard Cite

The thermodynamic analysis of the thermal decomposition reaction of carbonates showed that the temperatures of thermal stability of dolomite and magnesium carbonate are very similar. Kinetics of isothermal and non-isothermal decompositions of natural dolomite in air atmosphere were investigated. Under the examined conditions, dolomite decomposed in a one-stage process. The final solid products of dolomite's decomposition were calcium and magnesium oxides. The average value of isoconversional apparent activation energy of non-isothermal decomposition was 205.60 kJ mol -1 . The kinetics of decomposition can be described by the power-law model P2/3 with ln(A) = 20.98 for the extent of reaction a \ 0.77 and by two-dimensional diffusion model D2 with ln(A) = 21.12 for a [ 0.77.

show abstract

Section: Introductionmentioning

confidence: 99%

Thermal behavior of natural dolomite

Olszak-Humienik

Jabłoński

2014

J Therm Anal Calorim

128

View full text Add to dashboard Cite

show abstract

“…After treatment at 800ºC, the solid product consists of the two main components: calcite (calcium carbonate) and magnesium oxide. The precise mechanism for the reaction is still uncertain (Otsuka 1986). However, the composition of the new † First presented at the 5th Ukrainian-Polish Symposium on Theoretical and Experimental Studies of Interfacial Phenomena and their Technological Applications, Odessa, Ukraine, 4-9 September 2000.…”

Section: Introductionmentioning

confidence: 99%

Physicochemical Study of ‘Dolomitic’ Sorbents Prepared under Different Thermal Conditions. Part III. The Influence of Carbon Dioxide Content over a Heated Sample

Stefaniak

Biliński

Dobrowolski

et al. 2001

Adsorption Science & Technology

View full text Add to dashboard Cite

ABSTRACT:The physicochemical properties of 'dolomitic' sorbents formed through the partial decomposition of dolomite have been discussed in two papers published previously dealing with the influence of temperature and the time of heating. When carried out at 800ºC, the newly formed solid consisted of spongelike calcite and finely powdered magnesium oxide which was resistant mechanically and exhibited considerably greater porosity than the raw material. Long-term heating led to a decrease in the porosity and to the partial elimination of pores. The corresponding 'dolomitic' sorbents prepared in an inert atmosphere showed even greater porosity and a different internal structure when compared to those formed in the presence of carbon dioxide. However, no changes were observed as far as the chemical composition was concerned.

show abstract

“…Many ferroan dolomites have also been studied using DTA (Beck, 1950;Kulp et al, 1951;Stadler, 1964;Smykatz-Kloss, 1964;Todor, 1976;Iwafuchi et al, 1983;Otsuka, 1986). Essentially three endotherms, each accompanied by a weight loss, and an exotherm succeeding the first endotherm were reported in air.…”

Section: Introductionmentioning

confidence: 99%

“…The lower-temperature peak is believed to be associated with breakdown of the dolomite structure/magnesium carbonate component and the higher-temperature peak with remaining calcium carbonate. The mechanism of decomposition has been investigated extensively (Haul et al, 1951;Kulp et al, 1951;Haul and Heystek, 1952;Haul and Wilsdorf, 1952;Bandi and Krapf, 1976) and the subject has been reviewed by Otsuka (1986).…”

Section: Introductionmentioning

confidence: 99%

Differential Scanning Calorimetry of Minerals of the Dolomite-Ferroan-Dolomite-Ankerite Series in Flowing Carbon Dioxide

Dubrawski¹

1988

Mineral. mag.

View full text Add to dashboard Cite

The dolomite-ferroan-dolomite-ankerite series of carbonate minerals has been investigated in flowing carbon dioxide using high-temperature DSC. Decomposition products were analysed by X-ray diffraction. The minerals studied included dolomite containing no iron, and members substituted by iron in the molar ratio range of 0.082 to 0.49. Complete resolution of the three main endothermic features was observed and enthalpy values AH, determined from each. The individual and total enthalpy values showed a linear dependence upon the Fe and Mg content of the members across the series. A decrease in the enthalpy of decomposition occurs with increasing Fe content. The effect of Fe substitution was readily observed and the estimated limit of detection is less than 1% FeO. Accuracy of the measurements was limited by the purity of the minerals themselves.

show abstract

Recent studies on the decomposition of the dolomite group by thermal analysis

Cited by 81 publications

References 18 publications

Thermal behavior of natural dolomite

Thermal behavior of natural dolomite

Physicochemical Study of ‘Dolomitic’ Sorbents Prepared under Different Thermal Conditions. Part III. The Influence of Carbon Dioxide Content over a Heated Sample

Differential Scanning Calorimetry of Minerals of the Dolomite-Ferroan-Dolomite-Ankerite Series in Flowing Carbon Dioxide

Contact Info

Product

Resources

About