The Thermal Dissociation of Calcium Carbonate.

Johnston, John

doi:10.1021/ja01926a006

Cited by 85 publications

(29 citation statements)

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“…Johnston 17 and Mitchell 18 determined the equilibrium temperature at which calcium carbonate dissociates at atmospheric pressure to be 1171 K. Both the decomposition temperature and reaction time affect the physical properties of the formed calcium oxide. A high burning temperature and long calcination time yield a hard-burned quicklime that has high density and low porosity; whereas a low burning temperature and short burning duration yield soft-burned lime with low density and high porosity (Boynton 19 ).…”

Section: Resultsmentioning

confidence: 99%

Application of Plasma Technology to Fracture Tight Formations

Muftah¹,

Zekri²

2001

Proceedings of SPE Annual Technical Conference and Exhibition

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractTight formations are normally fractured using different fluids under high pressure to improve well permeability and consequently improve productivity. In this paper, a new sophisticated technique is proposed to treat tight formations, especially those containing large deposits of heavy oil. The technique consists of exposing the wellbore to an argon plasma jet to insure instantaneous and efficient heat transfer to the surrounding wellbore rocks.The high temperature associated with the plasma jet changes the basic properties of the rock resulting in a significant increase in its porosity and permeability. In this study the effect of high temperature on the carbonate rock porosity and permeability is investigated. Limestone rocks were subjected to high temperatures ranging from 800 to 1200 °C. At temperatures beyond 600 °C, the carbonate rock decomposes to form calcium oxide and carbon dioxide. TGA analysis of carbonate samples indicated that the rate of decomposition at atmospheric pressure depended mainly on reaction temperature. At low temperatures, the rate of reaction was so slow that only 5% of the carbonate converted to calcium oxide in a period of one hour, while at 1000 °C complete conversion was achieved in five minutes. The changes of the pore structure under different temperatures were also observed using Scanning Electron Microscope (SEM). Porosity & permeability analysis of heated carbonate samples indicated that the porosity and permeability increased by 100% and 4500 % respectively at 1000 °C.

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Section: Resultsmentioning

confidence: 99%

Application of Plasma Technology to Fracture Tight Formations

Muftah¹,

Zekri²

2001

Proceedings of SPE Annual Technical Conference and Exhibition

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“…When combustion is used, acid pretreatments are necessary to remove any carbon -containing minerals, such as carbonates, which will decompose at temperatures above 750 ° C (Johnston 1910 ;Armitage et al 2001 ). The fi rst acid treatment dissolves carbon -containing minerals, such as limestone.…”

Section: Chemical P Retreatmentmentioning

confidence: 99%

Radiocarbon Dating of Rock Paintings: Incorporating Pictographs into the Archaeological Record

Steelman

Rowe

2012

A Companion to Rock Art

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“…The result is that the Co 2 concentration in the kiln will rise from 20-30 % to over 80 %. The effect of raising the partial pressure of Co 2 on the calcination (thermal decomposition) of limestone © Woodhead Publishing Limited, 2010 has been understood for almost a century (Johnston, 1910). The temperature at which the reaction (equation 15.1) proceeds (i.e.…”

Section: Oxygen Combustionmentioning

confidence: 99%