氟化镍添加剂对铝电解用炭间糊性能的影响

通过添加不同含量的氟化镍(NiF₂)对改质沥青-煤焦油复合粘结剂进行改性, 并采用改性复合粘结剂与电煅无烟煤、沥青焦、熟碎制备铝电解用炭间糊, 研究NiF₂添加量对炭间糊常规性能、膨胀/收缩过程、质量损失过程以及微观结构的影响。结果表明, 随着NiF₂添加量增加, 炭间糊的致密程度和导电性能逐渐提高, 耐压强度和膨胀/收缩率均呈先增大后减小的变化趋势, 挥发分在8.86%~9.53%范围内波动；体积膨胀显著增加, 焦化温度提前, 残炭值提高；NiF₂添加剂的反应产物以复杂混合物形式分布于粘结焦层片结构。当NiF₂添加量为4%时, 炭间糊的综合性能达到最佳。

Effect of NiF2 Additive on Properties of Ramming Paste for Aluminum Electrolysis

A kind of complex binder consisting of the modified pitch and coal tar was modified by adding different amount of NiF₂, which was then used, together with calcined anthracite coal, coal-derived pitch coke and baked scrap, to synthesize ramming pastes for aluminum electrolysis. The effect of NiF₂ addition on the conventional properties, expansion/shrinkage process, mass loss process and microstructure of the ramming paste were investigated. Results indicated that with the increasing of NiF₂ addition, the density and conductivity of ramming paste gradually increased, while both compressive strength and expansion/shrinkage ratio showed an initial rise followed by a downward trend. The volatile matter content fluctuated in the range of 8.86%~9.53%. Furthermore, an increased addition of NiF₂ resulted in a remarkable volume expansion, reduction in the coking temperature and a high carbon residue value. The reaction products of NiF₂ additive was distributed as a complex mixture in the aromatic layer structure of binder coke. With an addition of NiF₂ at 4%, the ramming paste showed optimal comprehensive properties.