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
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.