Phase equilibrium study in the CaO-K2O-B2O3-H2O system at 25°C

Zsolt Apagyi; Laszlo J. Csetenyi

doi:10.1016/S0008-8846(01)00529-4

Phase equilibrium study in the CaO-K2O-B2O3-H2O system at 25°C

Zsolt Apagyi, Laszlo J. Csetenyi (Lead / Corresponding author)

Civil Engineering

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

The CaO-K₂O-B₂O₃-H₂O system has been investigated at 25°C by extending experimentally data in the literature. By analogy with the corresponding known Na-borates, seven supersaturated mixtures of similar alkali/boron molar ratios were prepared but with potassium substituting for sodium. The mixtures were shaken regularly and attainment of the equilibrium state was monitored by flame emission spectroscopy for potassium. Equilibria were established typically after 1-3 months. The solids in the mixtures were identified by X-ray diffraction technique, and the solutions were analysed using ICP-spectroscopy. Solubility data of KB₅O₈·4H₂O, KB₃O₃(OH)₄·2H₂O, K₂B₄O₅(OH)₄· 2H₂O, KBO₂·1.25H₂O, and K₂CaB₈O₁₄·12H₂O were determined and used to extend the database of the thermodynamic modelling computer code PHREEQC. Phase diagrams of the CaO-K₂O-B₂O₃-H₂O system and its subsystems were constructed for 25°C.

Original language	English
Pages (from-to)	1087-1091
Number of pages	5
Journal	Cement and Concrete Research
Volume	31
Issue number	7
DOIs	https://doi.org/10.1016/S0008-8846(01)00529-4
Publication status	Published - 1 Jul 2001

Keywords

Borate
CaO
KOH
Modelling
Thermodynamic calculations

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title = "Phase equilibrium study in the CaO-K2O-B2O3-H2O system at 25°C",

abstract = "The CaO-K2O-B2O3-H2O system has been investigated at 25°C by extending experimentally data in the literature. By analogy with the corresponding known Na-borates, seven supersaturated mixtures of similar alkali/boron molar ratios were prepared but with potassium substituting for sodium. The mixtures were shaken regularly and attainment of the equilibrium state was monitored by flame emission spectroscopy for potassium. Equilibria were established typically after 1-3 months. The solids in the mixtures were identified by X-ray diffraction technique, and the solutions were analysed using ICP-spectroscopy. Solubility data of KB5O8·4H2O, KB3O3(OH)4·2H2O, K2B4O5(OH)4· 2H2O, KBO2·1.25H2O, and K2CaB8O14·12H2O were determined and used to extend the database of the thermodynamic modelling computer code PHREEQC. Phase diagrams of the CaO-K2O-B2O3-H2O system and its subsystems were constructed for 25°C.",

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author = "Zsolt Apagyi and Csetenyi, {Laszlo J.}",

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AU - Apagyi, Zsolt

AU - Csetenyi, Laszlo J.

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Y1 - 2001/7/1

N2 - The CaO-K2O-B2O3-H2O system has been investigated at 25°C by extending experimentally data in the literature. By analogy with the corresponding known Na-borates, seven supersaturated mixtures of similar alkali/boron molar ratios were prepared but with potassium substituting for sodium. The mixtures were shaken regularly and attainment of the equilibrium state was monitored by flame emission spectroscopy for potassium. Equilibria were established typically after 1-3 months. The solids in the mixtures were identified by X-ray diffraction technique, and the solutions were analysed using ICP-spectroscopy. Solubility data of KB5O8·4H2O, KB3O3(OH)4·2H2O, K2B4O5(OH)4· 2H2O, KBO2·1.25H2O, and K2CaB8O14·12H2O were determined and used to extend the database of the thermodynamic modelling computer code PHREEQC. Phase diagrams of the CaO-K2O-B2O3-H2O system and its subsystems were constructed for 25°C.

AB - The CaO-K2O-B2O3-H2O system has been investigated at 25°C by extending experimentally data in the literature. By analogy with the corresponding known Na-borates, seven supersaturated mixtures of similar alkali/boron molar ratios were prepared but with potassium substituting for sodium. The mixtures were shaken regularly and attainment of the equilibrium state was monitored by flame emission spectroscopy for potassium. Equilibria were established typically after 1-3 months. The solids in the mixtures were identified by X-ray diffraction technique, and the solutions were analysed using ICP-spectroscopy. Solubility data of KB5O8·4H2O, KB3O3(OH)4·2H2O, K2B4O5(OH)4· 2H2O, KBO2·1.25H2O, and K2CaB8O14·12H2O were determined and used to extend the database of the thermodynamic modelling computer code PHREEQC. Phase diagrams of the CaO-K2O-B2O3-H2O system and its subsystems were constructed for 25°C.

KW - Borate

KW - CaO

KW - KOH

KW - Modelling

KW - Thermodynamic calculations

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