Gibbs free energy of formation of kaolinite from solubility measurement in basic solution between 60 and 170 °C

Details Gibbs free energy of formation of kaolinite from solubility measurement in basic solution between 60 and 170 °C Gibbs free energy of formation of kaolinite from solubility measurement in basic solution between 60 and 170 °C

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996gecoa..60..553d&link_type=abstract

Geochimica et Cosmochimica Acta, Volume 60, Issue 4, p. 553-564.

Other

Scientific paper

The solubility of a natural hydrothermal kaolinite was measured in buffered alkaline solutions at temperatures ranging from 60 to 170 °C. At temperatures below 110 °C equilibrium was obtained from undersaturation, while above 110 °C two different steady states were obtained, one from undersaturation and another from supersaturation. Raman spectroscopy studies of the solid phases recovered at the end of each run, demonstrated that the “undersaturated” experiments attained equilibrium with respect to kaolinite, while the “supersaturated” experiments attained equilibrium with an illite-like mineral. Regression of kaolinite solubility products yields a Gibbs free energy of formation of kaolinite (Al2Si2O5(OH)4) at 25 °C of -907.68 ± 0.2 kcal/mol. This value is more negative than most literature values, but similar to that generated from calorimetric data by Barany and Kelley (1961). Furthermore, calculated thermodynamic parameters generated from kaolinite solubility obtained in this study are in close agreement with those deduced from boehmite-kaolinite equilibrium data at temperatures higher than 200 °C.

Affiliated with

Also associated with

No associations

Rating

Gibbs free energy of formation of kaolinite from solubility measurement in basic solution between 60 and 170 °C does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Gibbs free energy of formation of kaolinite from solubility measurement in basic solution between 60 and 170 °C, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gibbs free energy of formation of kaolinite from solubility measurement in basic solution between 60 and 170 °C will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1155675