CAJ | 학술논문

应用Bromley方程，结合草酸钠溶解热力学理论及其在水溶液、氢氧化钠溶液中的溶解度数据，得出草酸钠的Bromley参数为?0.045，并以此为基础建立铝酸钠溶液中草酸钠的溶解度计算模型。应用该模型计算纯铝酸钠溶液体系中草酸钠的溶解度，结果与文献数据吻合较好。在此基础上，模拟计算了拜耳法氧化铝生产过程中草酸钠平衡浓度的变化规律。结果表明：碱浓度越高、温度越低、苛性比越高，铝酸钠溶液中草酸钠平衡浓度越低；铝酸钠溶液体系中，碳酸钠、硫酸钠对草酸钠溶解度的影响很小。这些结果可以解释草酸钠在生产氧化铝过程中的积累和析出规律，有助于生产过程铝酸钠溶液中草酸钠含量的控制。
응용Bromley방정，결합초산납용해열역학이론급기재수용액、경양화납용액중적용해도수거，득출초산납적Bromley삼수위?0.045，병이차위기출건립려산납용액중초산납적용해도계산모형。응용해모형계산순려산납용액체계중초산납적용해도，결과여문헌수거문합교호。재차기출상，모의계산료배이법양화려생산과정중초산납평형농도적변화규률。결과표명：감농도월고、온도월저、가성비월고，려산납용액중초산납평형농도월저；려산납용액체계중，탄산납、류산납대초산납용해도적영향흔소。저사결과가이해석초산납재생산양화려과정중적적루화석출규률，유조우생산과정려산납용액중초산납함량적공제。
The calculation model of sodium oxalate’s solubility in sodium aluminate solution was established by Bromley equation with the solubility values of sodium oxalate in the aqueous and sodium hydroxide solution, and Bromley parameter of sodium oxalate calculated by this model is?0.045. Using this calculation model, the solubility values of sodium oxalate in sodium aluminate solution were calculated and a high degree of agreement can be reached compared with the data in literatures. On this basis, the equilibrium concentration values of sodium oxalate in Bayer liquors were calculated. The results show that, the higher the alkali concentration and caustic ratio are or the lower the temperature is, the lower the equilibrium concentration of sodium oxalate is. The concentration of sodium carbonate or sodium sulfate has little effect on the solubility of sodium oxalate. These results can explain the law of the accumulation and precipitation of sodium oxalate in alumina production process, and contribute to controlling the concentration of sodium oxalate in the process.