SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2015, Vol. 23 ›› Issue (11): 1768-1773.DOI: 10.1016/j.cjche.2015.10.001

• 分离科学与工程 • 上一篇    下一篇

Synthesis and adsorption property of zeolite FAU/LTA from lithium slag with utilization of mother liquid

Guo Lin, Qiang Zhuang, Qun Cui, Haiyan Wang, Huqing Yao   

  1. College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China
  • 收稿日期:2015-03-23 修回日期:2015-09-28 出版日期:2015-11-28 发布日期:2015-12-18
  • 通讯作者: Qun Cui
  • 基金资助:

    Supported by the National Natural Science Foundation of China (51476074).

Synthesis and adsorption property of zeolite FAU/LTA from lithium slag with utilization of mother liquid

Guo Lin, Qiang Zhuang, Qun Cui, Haiyan Wang, Huqing Yao   

  1. College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China
  • Received:2015-03-23 Revised:2015-09-28 Online:2015-11-28 Published:2015-12-18
  • Contact: Qun Cui
  • Supported by:

    Supported by the National Natural Science Foundation of China (51476074).

摘要: Co-crystalline zeolite FAU/LTA-0 was synthesized by hydrothermal method from lithiumslag. To make themost of excess silicon and alkali sources inmother liquid derived fromFAU/LTA-0, zeolite FAU/LTA-1bwas synthesized in the samemethodwith the use ofmother liquid by adding a certain amount of aluminumsource. Influences of different adding ways of aluminum source and recycling dosages of mother liquid on synthesis of zeolites FAU/ LTA with mother liquid were investigated. The phase, microstructure and thermostability of FAU/LTA-0 and FAU/LTA-1b were characterized by XRD, SEM and TG-DTA. The calcium and magnesium cation exchange capacities (CECs) of the zeolites were determined. The results have shown that co-crystalline zeolite can be synthesized with the use of mother liquid by adding aluminum source after 2 h of reaction. Compared with FAU/LTA-0, the crystal twinning structure of FAU/LTA-1b became weaker, the grain size was smaller, and the thermostability was better. With a lower dosage of mother liquid, the content of P-type impurity in product decreased significantly, and the content of LTA phase increased. The reuse rate of mother liquid can reach 48%. The CECs of FAU/LTA-1b-150 can reach 343 mg CaCO3·g-1 and 180 mg MgCO3·g-1, showing more excellent adsorption capacities than FAU/LTA-0 and commercial zeolite 4A. The full recycling use of mother liquid to synthesize zeolite FAU/LTA which can be applied for detergent not only improves resource utilization but also reduces production cost.

关键词: Lithium slag, FAU/LTA, Co-crystalline zeolite, Mother liquid, Detergent builder

Abstract: Co-crystalline zeolite FAU/LTA-0 was synthesized by hydrothermal method from lithiumslag. To make themost of excess silicon and alkali sources inmother liquid derived fromFAU/LTA-0, zeolite FAU/LTA-1bwas synthesized in the samemethodwith the use ofmother liquid by adding a certain amount of aluminumsource. Influences of different adding ways of aluminum source and recycling dosages of mother liquid on synthesis of zeolites FAU/ LTA with mother liquid were investigated. The phase, microstructure and thermostability of FAU/LTA-0 and FAU/LTA-1b were characterized by XRD, SEM and TG-DTA. The calcium and magnesium cation exchange capacities (CECs) of the zeolites were determined. The results have shown that co-crystalline zeolite can be synthesized with the use of mother liquid by adding aluminum source after 2 h of reaction. Compared with FAU/LTA-0, the crystal twinning structure of FAU/LTA-1b became weaker, the grain size was smaller, and the thermostability was better. With a lower dosage of mother liquid, the content of P-type impurity in product decreased significantly, and the content of LTA phase increased. The reuse rate of mother liquid can reach 48%. The CECs of FAU/LTA-1b-150 can reach 343 mg CaCO3·g-1 and 180 mg MgCO3·g-1, showing more excellent adsorption capacities than FAU/LTA-0 and commercial zeolite 4A. The full recycling use of mother liquid to synthesize zeolite FAU/LTA which can be applied for detergent not only improves resource utilization but also reduces production cost.

Key words: Lithium slag, FAU/LTA, Co-crystalline zeolite, Mother liquid, Detergent builder