SCI和EI收录∣中国化工学会会刊

Chin.J.Chem.Eng. ›› 2012, Vol. 20 ›› Issue (5): 831-836.

• SEPARATION SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Recovery of Tungsten (Ⅵ) from Aqueous Solutions by Complexation-ultrafiltration Process with the Help of Polyquaternium

ZENG Jianxian, SUN Xiahui, ZHENG Lifeng, HE Qincheng, LI Shu   

  1. College of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
  • Received:2011-03-10 Revised:2011-10-16 Online:2012-11-06 Published:2012-10-28
  • Supported by:
    Supported by the National Natural Science Foundation of China (20976040);Science and Technology Planning Project of Hunan Province of China (2009SK3036)

Recovery of Tungsten (Ⅵ) from Aqueous Solutions by Complexation-ultrafiltration Process with the Help of Polyquaternium

曾坚贤, 孙霞辉, 郑立锋, 贺勤程, 李书   

  1. College of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
  • 通讯作者: ZENG Jianxian,E-mail:zengjianxian@163.com
  • 基金资助:
    Supported by the National Natural Science Foundation of China (20976040);Science and Technology Planning Project of Hunan Province of China (2009SK3036)

Abstract: Polyquaternium-6 (PQ6) as the water-soluble polymer was used for complexing the anion forms of tungsten (Ⅵ) before ultrafiltration. Tungsten (Ⅵ)-PQ6 complex was retained by polysulfone hollow fiber ultrafiltration membrane in the complexation-ultrafiltration process. Effects of various operating parameters such as polymer metal ratio(PMR), pH and chloride ion concentration on permeate flux (J) and tungsten rejection coefficient (R) were investigated. The integration of four experiments including concentration, decomplexation, diafiltration and reuse of regenerated polymer was carried out. In the process of concentration, J declines slowly and R is about 1 at PMR of 3 and pH of 7. Tungsten concentration in the retentate increases linearly with volume concentration factor. Tungsten is concentrated efficiently with the membrane. The concentrated retentate was used further for the decomplexation. It takes about 6 min to reach the decomplexation equilibrium at chloride ion concentration of 50 mg·L-1. The decomplexation percentage of tungsten (Ⅵ)-PQ6 complex reaches 56.1%. In the diafiltration process, tungsten (Ⅵ) can be extracted effectively by using 50 mg·L-1 chloride ion solution, and the purification of the regenerated PQ6 is acceptably satisfactory. The regenerated PQ6 was used to bind tungsten (Ⅵ) at various pH values. The binding capacity of the regenerated PQ6 is close to that of fresh PQ6, and the recovery percentage of binding capacity is higher than 90%.

Key words: tungsten (Ⅵ), polyquaternium-6, complexation, ultrafiltration

摘要: Polyquaternium-6 (PQ6) as the water-soluble polymer was used for complexing the anion forms of tungsten (Ⅵ) before ultrafiltration. Tungsten (Ⅵ)-PQ6 complex was retained by polysulfone hollow fiber ultrafiltration membrane in the complexation-ultrafiltration process. Effects of various operating parameters such as polymer metal ratio(PMR), pH and chloride ion concentration on permeate flux (J) and tungsten rejection coefficient (R) were investigated. The integration of four experiments including concentration, decomplexation, diafiltration and reuse of regenerated polymer was carried out. In the process of concentration, J declines slowly and R is about 1 at PMR of 3 and pH of 7. Tungsten concentration in the retentate increases linearly with volume concentration factor. Tungsten is concentrated efficiently with the membrane. The concentrated retentate was used further for the decomplexation. It takes about 6 min to reach the decomplexation equilibrium at chloride ion concentration of 50 mg·L-1. The decomplexation percentage of tungsten (Ⅵ)-PQ6 complex reaches 56.1%. In the diafiltration process, tungsten (Ⅵ) can be extracted effectively by using 50 mg·L-1 chloride ion solution, and the purification of the regenerated PQ6 is acceptably satisfactory. The regenerated PQ6 was used to bind tungsten (Ⅵ) at various pH values. The binding capacity of the regenerated PQ6 is close to that of fresh PQ6, and the recovery percentage of binding capacity is higher than 90%.

关键词: tungsten (Ⅵ), polyquaternium-6, complexation, ultrafiltration