研究铁酸钠的合成及其脱除铝酸钠溶液中S2−的反应。热力学分析表明通过焙烧Fe2O3和Na2CO3的混合物合成铁酸钠的最低温度为810 K。结果表明：在1173 K焙烧60 min可以完全形成铁酸钠，且升高温度和减小Na2CO3粒径有利于加速铁酸钠的形成。铁酸钠可高效脱除铝酸钠溶液中的S2−，在铁硫摩尔比为1：1~1.5：1，温度为373 K，反应时间为60 min的条件下，脱硫率约为70%。脱硫过程是通过Fe(OH 与 S2−在铝酸钠溶液中反应)−4生成NaFeS2·2H2O沉淀实现的，脱硫效率取决于铁酸钠溶解生成的Fe(OH 。)−4%The synthesis of sodium ferrite and its desulfurization performance in S2−-bearing sodium aluminate solutions were investigated. The thermodynamic analysis shows that the lowest temperature is about 810 K for synthesizing sodium ferrite by roasting the mixture of ferric oxide and sodium carbonate. The results indicate that the formation process of sodium ferrite can be completed at 1173 K for 60 min, meanwhile raising temperature and reducing Na2CO3 particle size are beneficial to accelerating the formation of sodium ferrite. Sodium ferrite is an efficient desulfurizer to remove the S2− in aluminate solution, and the desulfurization rate can reach approximately 70% at 373 K for 60 min with the molar ratio of iron to sulfur of 1:1−1.5:1. Furthermore, the desulfurization is achieved by NaFeS2·2H2O precipitation through the reaction of Fe(OH and S2− in aluminate solution, and the )−4 desulfurization efficiency relies on the Fe(OH)−4 generated by dissolving sodium ferrite.
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