›› 2009, Vol. 9 ›› Issue (2): 293-299.
• 过程与工艺 • Previous Articles Next Articles
CHEN Ye LIU Wei, DU Ling-zhong ZHANG Wei-gang
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陈烨 张登君 张伟刚 张伟刚
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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
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
CLC Number:
TB333
CHEN Ye LIU Wei; DU Ling-zhong ZHANG Wei-gang. Coating Uniformity of Ni/C Composite Particles[J]. , 2009, 9(2): 293-299.
陈烨 张登君 张伟刚 张伟刚. 镍包石墨(Ni/C)微颗粒镍镀层的均匀性[J]. , 2009, 9(2): 293-299.
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