A novel method for the recovery of sodium from alumina-extracted fly ash (AEFA) using concentrated Na2CO3 solution is presented. Sodium was efficiently extracted from AEFA, which was mainly composed of NaCaHSiO4. The factors influencing the process were systematically investigated, and the optimal conditions were determined to be: reaction temperature = 180°C, Na2CO3 concentration = 170 g/L, liquid-to-solid ratio = 10 mL/g, and reaction time = 2 h. Under optimal conditions, a low Na2O content of 1.02 wt% of the products, with Na2O extraction rate of 93.79% was achieved. The results indicated that this process was more effective than the recovery of sodium from AEFA using a dilute NaOH solution. Furthermore, this process avoided the production of a dilute NaOH solution, therefore lowering the energy consumption during the concentration and recycling of sodium, when compared with the NaOH-based route. Therefore, the recovery of sodium from AEFA using concentrated Na2CO3 solution is more suitable for use in industrial applications.
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机译：介绍了一种使用浓浓甲Na 2 CO 3溶液从氧化铝提取的粉煤灰（AEFA）回收钠的新方法。从AEFA有效地提取钠，其主要由NaCaHSiO 4组成。影响该过程的因素被系统地研究，确定了最佳条件是：反应温度= 180℃，Na 2 CO 3浓度= 170g / L，液体与实际比率= 10mL / g，反应时间= 2 H。在最佳条件下，低Na 2 O含量为1.02重量％的产物，达到93.79％的Na 2 O提取率。结果表明，使用稀释的NaOH溶液，该方法比从AEFA的钠的回收更有效。此外，该过程避免了稀释NaOH溶液的产生，因此与NaOH的途径相比，降低钠浓度和再循环期间的能量消耗。因此，使用浓缩Na 2 CO 3溶液从AEFA的钠的回收更适合于工业应用。
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