改进和控制石墨电极用粘结剂沥青的质量

IMPROVEMENT AND CONTROL OF THE QUALITY OF BINDER PITCH FOR GRAPHITE ELECTRODES

研究了影响沥青结焦率和软化点(SP)的因素,以确定改进和控制其质量的工艺过程。从不同焦油中得到的沥青结焦率与BI含量呈线性关系。沥青是在恒定的操作条件下蒸馏制备的。由热重分析(TGA)测定的沥青结焦率在回流热处理条件下随苯不溶物(BI)含量的增加而增加。软化点随氮含量和BI含量的增加而增加。因此,提高BI含量和降低氮含量可以既不改变软化点而又增加石墨电极用粘结剂沥青的结焦率。

Factors influencing the coke yield and the softening point(SP) of pitches were studied to ascertain procedures for the improvement and control of their quality. The coke yield of pitches from different tar sources is expressed as a linear function of the BI content. Pitches were prepared by distillation under constant operating conditions. The coke yields of pitches, determined by thermogravimetric analysis (TGA). increased with their benzene insoluble (BI) content, which is controlled by reflux heat treatment. Softening point increased with the nitrogen content as well as BI content. Therefore increasing the BI content and decreasing the nitrogen content increases coke yield without any change in the softening point of binder pitches for graphite electrodes.