Abstract
In the presence of water ammonia solution the calcium bicarbonate converts into insoluble calcium carbonate. Linearly independent chemical reactions of calcium carbonate formation with application of ammoniac solution were defined by the Gram matrix. As a result of the thermodynamic analysis the probability of calcium ions extraction from water solutions was established. To define thermodynamic constants the program «Calculation of chemical reactions equilibrium on a wide interval of temperatures by an enthalpy method» was applied. Based upon given equilibrium constants and the law of mass action a equilibrium concentration of calcium ions was calculated. Furthermore, experimental data on calcium carbonate removal from standard test solution were obtained. The maximum level of calcium ions extraction in a solid phase was 92.11 %. The difference of equilibrium and operating concentrations defines a moving force of calcium carbonate formation that allows to calculate mass-transfer coefficient. The kinetics of CaCO3 formation in an ammoniac medium was studied. Analysis of kinetics of this process was carried out by means of Kazeeva-Yerofeev's equation with Sakovich's correction and the derived experimental data. The reaction order and activation energy of the chemical reaction were defined. These values show the process takes place in transition field.
| Original language | English |
|---|---|
| Title of host publication | Proceedings - 2012 7th International Forum on Strategic Technology, IFOST 2012 |
| DOIs | |
| Publication status | Published - 2012 |
| Event | 2012 7th International Forum on Strategic Technology, IFOST 2012 - Tomsk, Russian Federation Duration: 18 Sep 2012 → 21 Sep 2012 |
Other
| Other | 2012 7th International Forum on Strategic Technology, IFOST 2012 |
|---|---|
| Country | Russian Federation |
| City | Tomsk |
| Period | 18.9.12 → 21.9.12 |
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Keywords
- calcium bicarbonate
- calcium carbonate
- calcium ions
- water ammonia solution
- water hardness
ASJC Scopus subject areas
- Management of Technology and Innovation
Cite this
The physicochemical bases of calcium carbonate formation in modeling system CaCl2 + NaHCO3 + NH4OH. / Malanova, N. V.; Kosintcev, V. I.; Sechin, A. I.
Proceedings - 2012 7th International Forum on Strategic Technology, IFOST 2012. 2012. 6357496.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - The physicochemical bases of calcium carbonate formation in modeling system CaCl2 + NaHCO3 + NH4OH
AU - Malanova, N. V.
AU - Kosintcev, V. I.
AU - Sechin, A. I.
PY - 2012
Y1 - 2012
N2 - In the presence of water ammonia solution the calcium bicarbonate converts into insoluble calcium carbonate. Linearly independent chemical reactions of calcium carbonate formation with application of ammoniac solution were defined by the Gram matrix. As a result of the thermodynamic analysis the probability of calcium ions extraction from water solutions was established. To define thermodynamic constants the program «Calculation of chemical reactions equilibrium on a wide interval of temperatures by an enthalpy method» was applied. Based upon given equilibrium constants and the law of mass action a equilibrium concentration of calcium ions was calculated. Furthermore, experimental data on calcium carbonate removal from standard test solution were obtained. The maximum level of calcium ions extraction in a solid phase was 92.11 %. The difference of equilibrium and operating concentrations defines a moving force of calcium carbonate formation that allows to calculate mass-transfer coefficient. The kinetics of CaCO3 formation in an ammoniac medium was studied. Analysis of kinetics of this process was carried out by means of Kazeeva-Yerofeev's equation with Sakovich's correction and the derived experimental data. The reaction order and activation energy of the chemical reaction were defined. These values show the process takes place in transition field.
AB - In the presence of water ammonia solution the calcium bicarbonate converts into insoluble calcium carbonate. Linearly independent chemical reactions of calcium carbonate formation with application of ammoniac solution were defined by the Gram matrix. As a result of the thermodynamic analysis the probability of calcium ions extraction from water solutions was established. To define thermodynamic constants the program «Calculation of chemical reactions equilibrium on a wide interval of temperatures by an enthalpy method» was applied. Based upon given equilibrium constants and the law of mass action a equilibrium concentration of calcium ions was calculated. Furthermore, experimental data on calcium carbonate removal from standard test solution were obtained. The maximum level of calcium ions extraction in a solid phase was 92.11 %. The difference of equilibrium and operating concentrations defines a moving force of calcium carbonate formation that allows to calculate mass-transfer coefficient. The kinetics of CaCO3 formation in an ammoniac medium was studied. Analysis of kinetics of this process was carried out by means of Kazeeva-Yerofeev's equation with Sakovich's correction and the derived experimental data. The reaction order and activation energy of the chemical reaction were defined. These values show the process takes place in transition field.
KW - calcium bicarbonate
KW - calcium carbonate
KW - calcium ions
KW - water ammonia solution
KW - water hardness
UR - http://www.scopus.com/inward/record.url?scp=84871833105&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84871833105&partnerID=8YFLogxK
U2 - 10.1109/IFOST.2012.6357496
DO - 10.1109/IFOST.2012.6357496
M3 - Conference contribution
AN - SCOPUS:84871833105
SN - 9781467317702
BT - Proceedings - 2012 7th International Forum on Strategic Technology, IFOST 2012
ER -