The ingredients for the production of electrodes are aggregates and binders (see table 3.18 for the analysis of several binders and asphalt), in which the binder is added with
The dosage is 28-30%. The function of the binder is to uniformly cover the surface of the solid particles during the kneading process, so as to make the solid particles
The particles stick together and partially penetrate into the pores of the particles. After heat treatment, the binder is coking into coke, and the solid
The body particles are firmly bonded together. Due to the different types and properties of coke, the infiltration and affinity of binder to coke
The force is different, and the coking situation is different. To greatly improve the quality of graphite electrodes, in addition to improving the physical and chemical properties of bone cuisine and
The process conditions must also improve the performance of the binder, and the focus should be on the softening point, Qi and 13 resin content.
High softening point, high quinoline insolubles, high hydrocarbon ratio, large average molecular weight and high carbon residue can increase the specific gravity of the electrode and reduce the
Low porosity and improved mechanical strength. 13 resin is the main index of asphalt binder which can wet the carbonaceous aggregate,
It is mixed with the dispersed aggregate to form a plastic paste. After baking, the carbon particles are bonded into a rigid whole that can withstand a certain external force,
The graphite electrode has the characteristics of high strength, low resistivity and low coefficient of thermal expansion. These properties of modified asphalt are obviously better
Suitable for medium temperature asphalt. The quality index of Tianjin modified asphalt is better than Changchun Zhenbang modified asphalt, and the production is relatively stable,

In this experiment, all indexes of graphite rod produced with Tianjin modified asphalt are significantly better than those of medium temperature tear green produced by Angang (see table 319).

This is also illustrated by the microstructure of the products (as shown in Fig. 3 ll and Fig. 3 12).