摘要
采用平衡分析法，测定了常压下铬铁矿液相氧化生产铬盐工艺分离过程涉及的 NaOH-H2O-Na2CrO4、NaOH-H2O-NaAlO2、NaOH-H2O-Na2SiO3三元体系，NaOH-H2O-Na2CrO4-Na2SiO3、NaOH-H2O-Na2CrO4-NaAlO2、NaOH-H2O-Na2SiO3-NaAlO2四元体系及 NaOH-H2O-Na2CrO4-Na2SiO3-NaAlO2五元体系中 Na2CrO4、NaAlO2、Na2SiO3的溶解度，并使用Apelblat方程对实验数据进行了回归。实验的温度范围为353.15～403.15 K，除测量Na2CrO4在NaOH-H2O-Na2CrO4三元体系中的溶解度时NaOH的浓度从100 g·L^-1改变到800 g·L^-1，其他体系中都固定NaOH浓度为500 g·L^-1。研究结果表明铝酸钠、硅酸钠无论单独存在还是同时存在均会降低铬酸钠的溶解度，其中铝酸钠对铬酸钠的溶解度影响最大，而硅铝共存反而对铬酸钠溶解度影响最小。
The solubility of Na2CrO4, NaAlO2 and Na2SiO3 in the multicomponent systems related to the manufacture of chromium compounds by liquid-phase oxidation of chromite was measured by using the equilibrium analysis method at the atmospheric pressure and temperature ranging from 353.15 K to 403.15 K, which include ternary systems NaOH-H2O-Na2CrO4, NaOH-H2O-NaAlO2 and NaOH-Na2SiO3-H2O, quaternary systems NaOH-H2O- Na2CrO4-Na2SiO3, NaOH-H2O-Na2CrO4-NaAlO2 and NaOH-NaAlO2-Na2SiO3-H2O, and quinary systems NaOH-H2O-Na2CrO4-Na2SiO3-NaAlO2. Except the Na2CrO4 solubility in ternary system NaOH-H2O-Na2CrO4, in which NaOH concentration varied from 100 g·L^-1 to 800 g·L^-1, the NaOH concentration was constant at 500 g·L^-1. The experimental data were correlated by the Antonie equation,λ-h equation, and Apelblat equation, demonstrating that the Apelblat equation can well predict the solubility of the systems. The results show that the presence of NaAlO2 and Na2SiO3 decreases Na2CrO4solubility, while the coexistence of NaAlO2 and Na2SiO3 has less effect than the presence of single NaAlO2 and Na2SiO3.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2014年第10期3747-3752,共6页
CIESC Journal
基金
国家自然科学基金项目(20117620
51272296)~~
