The solubility of sodium vanadate and sodium nitrate was investigated in the NaVO 3 -NaNO 3 -H 2 O system at the temperature range 293-323 K, with the method of isothermal saturation of a solution. The obtained results gave a basis for the plot of a fragment of the solubility isotherm for the investigated system. That system is a part of the five-component NH 4 NO 3 -NaVO 3 -NH 4 VO 3 -NaNO 3 -H 2 O system and is necessary for plotting the solubility isotherm in the projection according to Janecke method. Knowledge of the course of that isotherm for the five-component system is necessary for determination of the optimal conditions for utilization of the postfiltration liquor from the soda production from NaNO 3 by the Solvay method with the use of NaVO 3 .
The solubilities of ammonium vanadate and ammonium nitrate in the NH4VO3−NH4NO3−H2O system were investigated at 293, 303, 313, and 323 K by the method of isothermal saturation of solutions. A section of the solubility isotherm for the investigated system was plotted based on the obtained data. Knowledge of that dependence is necessary for developing the new method of using the postfiltration liquor from the soda−chlorine−saltpeter (SCS) method of sodium carbonate production, based on an equilibrium plot for the quaternary system of pairs of the exchange salts NH4NO3−NaVO3−H2O.
The mutual solubility of salts in the ternary system NH4NO3 + NaNO3 + H2O was investigated in the
temperature range 293−323 K by the method of isothermal saturation of solutions. The data obtained were
used for plotting the section of the solubility polytherm for the system investigated. Knowledge of the course
of the solubility polytherm is necessary for developing a new method of utilization of the post-filtration lye
from the soda−chlorine−saltpeter method (SCS) of soda production.
Utilization of the post-filtration lye from the SCS method of soda production
The mutual solubility of salts in the NaVO3-NaNO3-H2O system was investigated at 293 - 323 K temperature range by the method of isothermal saturation of solutions. A fragment of the solubility polytherm for that system was plotted, based on the obtained data. The investigated system is a part of the quaternary NH4NO3-NaVO3-NH4VO3-NaNO3 system, and it is necessary for plotting the solubility isotherm as a planar projection according to Janecke, since it defines one edge of its square. Knowledge of the isotherm for that quaternary system is necessary to determine the optimal utilization conditions for the post-filtration lye, formed during the soda production from NaNO3 by the Solvay method, using NaVO3.
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