The physicochemical bases of calcium carbonate formation in modeling system CaCl2 + NaHCO3 + NH4OH

N. V. Malanova, V. I. Kosintcev, A. I. Sechin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 languageEnglish
Title of host publicationProceedings - 2012 7th International Forum on Strategic Technology, IFOST 2012
DOIs
Publication statusPublished - 2012
Event2012 7th International Forum on Strategic Technology, IFOST 2012 - Tomsk, Russian Federation
Duration: 18 Sep 201221 Sep 2012

Other

Other2012 7th International Forum on Strategic Technology, IFOST 2012
CountryRussian Federation
CityTomsk
Period18.9.1221.9.12

Fingerprint

Calcium carbonate
Calcium
Chemical reactions
Ions
Thermodynamics
Kinetics
Equilibrium constants
Water
Enthalpy
Ammonia
Mass transfer
Activation energy
System modeling
Temperature

Keywords

  • calcium bicarbonate
  • calcium carbonate
  • calcium ions
  • water ammonia solution
  • water hardness

ASJC Scopus subject areas

  • Management of Technology and Innovation

Cite this

Malanova, N. V., Kosintcev, V. I., & Sechin, A. I. (2012). The physicochemical bases of calcium carbonate formation in modeling system CaCl2 + NaHCO3 + NH4OH. In Proceedings - 2012 7th International Forum on Strategic Technology, IFOST 2012 [6357496] https://doi.org/10.1109/IFOST.2012.6357496

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 proceedingConference contribution

Malanova, NV, Kosintcev, VI & Sechin, AI 2012, The physicochemical bases of calcium carbonate formation in modeling system CaCl2 + NaHCO3 + NH4OH. in Proceedings - 2012 7th International Forum on Strategic Technology, IFOST 2012., 6357496, 2012 7th International Forum on Strategic Technology, IFOST 2012, Tomsk, Russian Federation, 18.9.12. https://doi.org/10.1109/IFOST.2012.6357496
Malanova NV, Kosintcev VI, Sechin AI. The physicochemical bases of calcium carbonate formation in modeling system CaCl2 + NaHCO3 + NH4OH. In Proceedings - 2012 7th International Forum on Strategic Technology, IFOST 2012. 2012. 6357496 https://doi.org/10.1109/IFOST.2012.6357496
Malanova, N. V. ; Kosintcev, V. I. ; Sechin, A. I. / The physicochemical bases of calcium carbonate formation in modeling system CaCl2 + NaHCO3 + NH4OH. Proceedings - 2012 7th International Forum on Strategic Technology, IFOST 2012. 2012.
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