煅后焦真密度对生坯电极体积密度的影响

THE INFLUENCE OF THE REAL DENSITY OF CALCINED COKE ON THE BULK DENSITY OF GREEN ELECTRODES

针状焦的真密度强烈地影响着石墨电极的体积密度:真密度高的焦炭往往产生低密度的电极。为阐明这一现象研究了这两个性质之间的关系。当将生焦煅烧至高温时,便产生包含较大微孔体积的高真密度针状焦。虽然焦炭中的微孔只在小的程度上影响体积密度,但这些微孔会引起焦粒沿着针状的纹理破裂,从而增强了焦粒的形状上各向异性(椭圆度)。焦粒的椭圆度影响着焦粒的堆积并影响生坯的体积密度。

The real density of needle coke strongly influences the bulk density of graphite electrodes: a coke of high real density tends to yield low density rods. The relation between these two properties was investigated to elucidate this phenomenon. When calcined at high temperatures, green coke yields needle coke of high real density containing greater volume of micropores, Although the micropores in the coke affect the bulk density only to a small extent, they may cause the coke particles to break along the needle-like grains and thus enhance the shape anisotropy (ellipticity) of the coke particles. The ellipticity of the coke grains influences their packing, which in turn influences the bulk density of the green rods.