SCI和EI收录∣中国化工学会会刊

›› 2015, Vol. 23 ›› Issue (3): 578-582.DOI: 10.1016/j.cjche.2014.11.017

• 能源、资源与环境技术 • 上一篇    下一篇

Dechlorination of pentachlorophenol by grinding at low rotation speed in short time

Zhi Xu1, Xiaoyu Zhang2, Qingzhi Fei1   

  1. 1 Department of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China;
    2 Institute of Environmental Engineering, Dalian Jiaotong University, Dalian 116028, China
  • 收稿日期:2013-06-20 修回日期:2014-02-12 出版日期:2015-03-28 发布日期:2015-04-03
  • 通讯作者: Qingzhi Fei

Dechlorination of pentachlorophenol by grinding at low rotation speed in short time

Zhi Xu1, Xiaoyu Zhang2, Qingzhi Fei1   

  1. 1 Department of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China;
    2 Institute of Environmental Engineering, Dalian Jiaotong University, Dalian 116028, China
  • Received:2013-06-20 Revised:2014-02-12 Online:2015-03-28 Published:2015-04-03

摘要: In order to apply grindingmethod for degradation of pentachlorophenol (PCP) to an industrial scale, the proportion of differentmaterials [CaO, SiO2 and CO(NH2)2] and the size of grinding balls were examined. For saving energy and increasing dechlorination efficiency, the rotation speed and grinding time were maintained at relatively low values. At a mass ratio of grinding balls to materials (40:1), PCP was added into a big steel jar (300 ml) with othermaterials to grind at 300 r·min-1 for 5 h. The results indicated thatwhen PCPwasmixedwith CaOand SiO2 in a molar ratio of 1:60:60, the best dechlorination of 58.4% was achieved. CO(NH2)2 could not be used as hydrogen donor in the dehalogenation bymechanochemical reaction, since it restrained the dechlorination process. The size of grinding balls has significant effect on the reaction. The experimentwith 5mmsteel balls indicates that the weight is too light to provide appropriate energy for the reaction, while steel balls of 10 and 15 mm could give better dechlorination reaction. It indicates that dechlorination depends on the mass of balls and fill rate.

关键词: Dechlorination, Pentachlorophenol, Rotation speed, Grinding time

Abstract: In order to apply grindingmethod for degradation of pentachlorophenol (PCP) to an industrial scale, the proportion of differentmaterials [CaO, SiO2 and CO(NH2)2] and the size of grinding balls were examined. For saving energy and increasing dechlorination efficiency, the rotation speed and grinding time were maintained at relatively low values. At a mass ratio of grinding balls to materials (40:1), PCP was added into a big steel jar (300 ml) with othermaterials to grind at 300 r·min-1 for 5 h. The results indicated thatwhen PCPwasmixedwith CaOand SiO2 in a molar ratio of 1:60:60, the best dechlorination of 58.4% was achieved. CO(NH2)2 could not be used as hydrogen donor in the dehalogenation bymechanochemical reaction, since it restrained the dechlorination process. The size of grinding balls has significant effect on the reaction. The experimentwith 5mmsteel balls indicates that the weight is too light to provide appropriate energy for the reaction, while steel balls of 10 and 15 mm could give better dechlorination reaction. It indicates that dechlorination depends on the mass of balls and fill rate.

Key words: Dechlorination, Pentachlorophenol, Rotation speed, Grinding time