TY - JOUR
T1 - Phase equilibrium study in the CaO-K2O-B2O3-H2O system at 25°C
AU - Apagyi, Zsolt
AU - Csetenyi, Laszlo J.
PY - 2001/7/1
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
UR - http://www.scopus.com/inward/record.url?scp=0035394422&partnerID=8YFLogxK
U2 - 10.1016/S0008-8846(01)00529-4
DO - 10.1016/S0008-8846(01)00529-4
M3 - Article
AN - SCOPUS:0035394422
VL - 31
SP - 1087
EP - 1091
JO - Cement and Concrete Research
JF - Cement and Concrete Research
SN - 0008-8846
IS - 7
ER -