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›› 2009, Vol. 9 ›› Issue (2): 293-299.

• 过程与工艺 • 上一篇    下一篇

镍包石墨(Ni/C)微颗粒镍镀层的均匀性

陈烨 张登君 张伟刚 张伟刚   

  1. 中国科学院过程工程研究所 中国科学院过程工程研究所 中国科学院过程研究所多相反应开放实验室
  • 收稿日期:2008-10-14 修回日期:2008-12-11 出版日期:2009-04-20 发布日期:2009-04-20
  • 通讯作者: 陈烨

Coating Uniformity of Ni/C Composite Particles

CHEN Ye LIU Wei, DU Ling-zhong ZHANG Wei-gang   

  1. Institute of process Engineering, Chinese Academy of Sciences Institute of process Engineering, Chinese Academy of Sciences Key Lab of Multi-phase Reactions, Institute of Process Engineering. Chinese Academy of Sciences
  • Received:2008-10-14 Revised:2008-12-11 Online:2009-04-20 Published:2009-04-20
  • Contact: CHEN Ye

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摘要： 采用湿式加压氢还原法制备球形Ni/C微颗粒，着重考察了核心颗粒的粒度分散性及氢气传质过程对石墨颗粒表面镍沉积层均匀性的影响. 结果表明，球形石墨颗粒粒径从30 mm增加到60 mm左右，对应的镍镀层厚度从4.5 mm增加至6.0 mm左右，减小核心颗粒的粒度分散性可以减小镀层厚度的差异，提高包覆均匀性；双叶轮搅拌速率在500~1000 r/min范围内有效强化了氢气在体系中的传质，得到的Ni/C颗粒镀覆均匀性明显改善，搅拌效果优于单叶轮.

关键词: Ni/C复合材料, 颗粒包覆, 镀层均匀性

Abstract: The influences of dispersivity of core particles and mass transfer of hydrogen on coating uniformity of spherical Ni/C composite particles in high pressure hydrogen reduction process were studied. The results showed that the thickness of nickel coating varied form 4.5 to 6.0 mm while the diameter of spherical graphite particles from 30 to 60 mm. Decreasing the size distribution of graphite particles could decrease the variation of coating thickness and improve the coating uniformity of Ni/C composite. Agitation with double blades was superior to single blade in the range of 500~1000 r/min stirring speeds. By using double blades, the mass transfer of hydrogen in the reaction system was effectively enhanced and the coating uniformity of obtained Ni/C composite obviously improved.

Key words: Ni/C composite, particle coating, coating uniformity

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