METHOD FOR DETERMINING RATE OF DISSOLUTION OF OXIDE IN OXIDE-HALIDE MELT Russian patent published in 2021 - IPC G01N27/49 

FIELD: chemical industry.

SUBSTANCE: invention makes it possible to determine the rate of dissolution of the oxide in the oxide-halide melt. The essence of the invention is that a portion of oxide is loaded into an oxide-halide melt placed in a crucible that is chemically stable with respect to the components of the melt at the measurement temperature, the time of complete dissolution of the portion of the oxide in the melt is recorded, and the change in the mass or moles of the oxide with respect to the time of complete dissolution of the portion of the oxide in the melt is calculated by the rate of dissolution of the oxide, while the time of complete dissolution of the portion of the oxide in the melt is determined using a working electrode and a counter-electrode, at the same time, before loading the next portion of the oxide into the oxide-halide melt, the working electrode is immersed in the melt under study and anodically polarized under conditions of potentiodynamic polarization at a rate of at least 1 V/s, fixing the limiting current of oxidation of oxygen ions in the melt under study, after which a portion of the oxide is loaded into the oxide-halide melt and after certain intervals under similar conditions, the operation of polarization of the working electrode is repeated, fixing the change in the limiting current of oxidation of oxygen ions on the working electrode, the operation of polarizing the working electrode is repeated until the fixed values of the limiting current are stabilized, while during the complete dissolution of the oxide portion, the time from the loading of the oxide to the moment of stabilization of the limiting current is taken.

EFFECT: simpler determination of the rate of dissolution of the oxide in the oxide-halide melt.

4 cl, 2dwg