| Phase relationship of complex multi-component system in chromate cleaner production |
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| 作者单位： | Ge Xinlei~1 Wang Xidong~(1，3**) Zheng Shili~2 Zhang Mei~1 Zhang Yi~2 (1.Department of Physical Chemistry，University of Science and Technology Beijing，Beijing 100083，China; 2.Institute of Process Engineering，Chinese Academy of Sciences，Beijing 100080，China; 3.College of Engineering，Peking University，Beijing 100871，China) |
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| 基金项目： | 国家自然科学基金;国家自然科学基金 |
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| 摘 要： | 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.
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Phase relationship of complex multi-component system in chromate cleaner production |
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| Authors: | Ge Xinlei Wang Xidong Zheng Shili Zhang Mei Zhang Yi |
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| Institution: | 1. Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China; 2. Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China; 3. College of Engineering, Peking University, Beijing 100871, China |
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| Abstract: | 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. |
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| Keywords: | chromite chromate system thermodynamics calculation phase diagram |
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