CIESC Journal ›› 2014, Vol. 65 ›› Issue (10): 3747-3752.DOI: 10.3969/j.issn.0438-1157.2014.10.001

Previous Articles     Next Articles

Solubility measurement and correlation in multicomponent systems related to separation process of liquid-phase oxidation of chromite

JIANG Chunli1,2,3, ZHANG Meixi2, TAN Shiyu1, DONG Lichun1,3, ZHANG Hongjing1   

  1. 1 School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China;
    2 Key Laboratory of Low-grade Energy Utilization Technologies & Systems of the Ministry of Education, Chongqing 400044, China;
    3 Chongqing Key Laboratory of Chemical Process for Clean Energy and Resource Utilization, Chongqing 400044, China
  • Received:2014-03-24 Revised:2014-05-29 Online:2014-10-05 Published:2014-10-05
  • Supported by:

    supported by the National Natural Science Foundation of China (20117620, 51272296).

铬盐液相氧化工艺分离过程中多元体系溶解度的测定及关联

江春立1,2,3, 张美羲2, 谭世语1, 董立春1,3, 张红晶1   

  1. 1 重庆大学化学化工学院, 重庆 400044;
    2 低品位能源利用技术及系统教育部重点实验室, 重庆 400044;
    3 洁净能源与资源利用化工过程重庆市重点实验室, 重庆 400044
  • 通讯作者: 张红晶
  • 基金资助:

    国家自然科学基金项目(20117620,51272296)。

Abstract: 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 Na2CrO4 solubility, while the coexistence of NaAlO2 and Na2SiO3 has less effect than the presence of single NaAlO2 and Na2SiO3.

Key words: Na2CrO4, solubility, equilibrium method, Apelblat equation, separation

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。

关键词: 铬酸钠, 溶解度, 平衡法, Apelblat方程, 分离

CLC Number: