Abstract:Agde und Schimmel: Beitrage zuf Kenntnis der Variolherutellung 111 I s2; : %&: m*e Der FHissigkeitszustand bildet daher einen merkwllrdigen Obergangszustand zwischen dem kristallisisrten Zustand, in. dem all@ Molektile genau nach einem Raumgitter geordnet liegen, und dem gentigend verdlinnten, gaslormigen Zustand, in dem sie regellos verteilt liegen werden. Der fltissige Zustand ist einerseits wie vor allem J. D. v a n d e r W a a 1 s uns gelehrt hat als ein Gas von groi3er Konzentration zu betrachten;das Gese… Show more
“…Figure 6 shows a magnification around the eutectic point. The eutectic point in this work was predicted at 2.36 mol kg -1 , 266.72 K. This compares well with the eutectic temperature 266.76 K reported by Bruni [24] and the eutectic point 2.30 mol kg -1 , 266.6 K reported by Agde and Schimmel [25]. A good overall fit was achieved with the data measured in this work, despite the rather large experimental uncertainties associated with the method.…”
Section: Enthalpy and Heat Capacitysupporting
confidence: 89%
“…Bruni [24] reported -6.4 °C as the eutectic temperature. Agde and Schimmel [25] observed the eutectic point at 2.30 mol kg -1 and -6.55 °C.…”
Internally consistent set of thermodynamic parameters was derived for the binary ZnSO4-H2O-system using the CALPHAD method. Available data on water activity, EMF measurements, solubility and heat of solution and dilution measurements was reviewed. Additional parameters for the ternary ZnSO4-H2SO4-H2O system were derived based on the available solubility and boiling point data. Solubility of zinc sulfate was predicted successfully under conditions relevant in hydrometallurgical processing of zinc, and even up to 15 mol/kg sulfuric acid solutions. Temperature dependent Pitzer parameters for the binary and ternary systems are reported.
“…Figure 6 shows a magnification around the eutectic point. The eutectic point in this work was predicted at 2.36 mol kg -1 , 266.72 K. This compares well with the eutectic temperature 266.76 K reported by Bruni [24] and the eutectic point 2.30 mol kg -1 , 266.6 K reported by Agde and Schimmel [25]. A good overall fit was achieved with the data measured in this work, despite the rather large experimental uncertainties associated with the method.…”
Section: Enthalpy and Heat Capacitysupporting
confidence: 89%
“…Bruni [24] reported -6.4 °C as the eutectic temperature. Agde and Schimmel [25] observed the eutectic point at 2.30 mol kg -1 and -6.55 °C.…”
Internally consistent set of thermodynamic parameters was derived for the binary ZnSO4-H2O-system using the CALPHAD method. Available data on water activity, EMF measurements, solubility and heat of solution and dilution measurements was reviewed. Additional parameters for the ternary ZnSO4-H2SO4-H2O system were derived based on the available solubility and boiling point data. Solubility of zinc sulfate was predicted successfully under conditions relevant in hydrometallurgical processing of zinc, and even up to 15 mol/kg sulfuric acid solutions. Temperature dependent Pitzer parameters for the binary and ternary systems are reported.
“…The three-phase equilibrium line (ZnSO 4 •7 H 2 O + ice + solution) reported by Agde and Schimmel [5] deviates considerably from the results obtained in this work. The four points they reported for the ternary system lay far from the surface measured and predicted in this work.…”
Section: Resultscontrasting
confidence: 87%
“…pressure has a small and compared to our measurement uncertainty, negligible effect on the freezing point, pressure of 0.1 MPa was assumed. Figure 3 shows the measurement results together with those reported by Agde and Schimmel [5] in the form of a ternary phase diagram. The solid curves at the sides are the binary freezing point curves, calculated with our previous model [1] and the Sippola model [7].…”
Section: Resultsmentioning
confidence: 75%
“…Although freezing point depression in the binary subsystems has been studied [1][2][3][4], previously reported measurements for the ternary system are scarse. Agde and Schimmel [5] studied the three-phase equilibrium ZnSO 4 •7 H 2 O(s) + ice + solution down to 263.15 K. Their results, however, differ greatly from the results of our thermodynamic model [1], which partly motivated this short study.…”
Auf Grund der Löslichkeitsdaten für die ternären schwefelsauren Systeme der Sulfate des Zn, Mg, Be, Fe, Co, Ni, Mn, Cu wird geprüft, ob und inwieweit solche nonvariante Punkte nachweisbar sind.
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