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The phase relationships of the complex multi-component systems in the liquid-phase oxidization and separation process related with the chromate cleaner production are investigated theoretically and experimentally.The phase diagram of main system Fe- Cr_2O_4-KOH-O_2 of oxidization process and the relationship of its standard Gibbs free energy change with temperature are calculated.A se- ries of phase diagrams of the separation process at different temperatures,such as K(Na)OH-K(Na)_2CrO_4-H_2O,KOH-KAlO_2-H_2O, K(Na)OH-K(Na)_2CO_3-H_2O,K(Na)OH-K(Na)HCO_3-H_2O and K(Na)HCO_3-K(Na)_2CrO_4-H_2O have also been calculated.Some ex- periments are carried out to verify the calculated results.Our results showed that the sub-molten salt media are suitable for the oxidization and separation processes;FeCr_2O_4 can be oxidized across a wide range of temperature;K(Na)_2CrO_4 can be separated from K(Na)AlO_2 system at appropriate temperature and proper concentration;the crystallization of carbonate is easier than that of K(Na)_2CrO_4.
The phase relationships of the complex multi-component systems in the liquid-phase oxidization and separation process related with the chromate cleaner production are investigated theoretically and experimentally. The phase diagram of the main system Fe-Cr204-KOH-O_2 of oxidization process and the relationship of its standard Gibbs free energy change with temperature are calculated. A seies of phase diagrams of the separation process at different temperatures, such as K (Na) OH-K (Na) _2CrO_4-H_2O, KOH-KAlO_2-H_2O, K (Na) OH-K (Na) _2CO_3-H_2O, K (Na) OH-K (Na) HCO_3-H_2O and K (Na) HCO_3-K (Na) _2CrO_4-H_2O have also been calculated. The results showed that the sub-molten salt media are suitable for the oxidization and separation processes; FeCr_2O_4 can be oxidized across a wide range of temperatures; K (Na) _2CrO_4 can be separated from K (Na ) AlO 2 system at appropriate temperature and proper concentration; the crystallization of carbonate is easier than that of K (Na) _2CrO_4.