According to the quality requirements of products, the selection of raw materials and process conditions, the cathode carbon blocks in China are divided into 3 categories: common cathode carbon block, semi graphite carbon block and graphite carbon block. Ordinary cathode carbon block with 1250 to 1350 degrees Celsius calcined anthracite as the main raw material. Semi graphite carbon block according to the production process is divided into two different.
Which is a kind of high quality high temperature calcined anthracite or graphite fragments more even with all the bits of graphite as aggregate, green products after forming only after calcination (calcination temperature less than 1200 DEG C) is no longer in the graphite furnace heat treatment, the carbon block called semi graphite carbon block.
Another with more easily to the graphite of the coke for aggregate, raw material after baking and then enter the graphite furnace in 1800 to 2000 degrees Celsius temperature for heat treatment, this kind of carbon block called semi graphite (chemical) carbon block. The strength and hardness of the former is higher, and the conductivity of the latter is better. Graphite carbon block, in order to ease the graphite coke as raw material, the temperature of its graphite processing should reach about 2500.
The difference between the semi - graphite carbon block and the graphite carbon block lies in the degree of the ordered arrangement of the products, which is different from the degree of the degree of. The size of the product can be used to indicate the extent of the degree of graphite. The crystal lattice of the graphite carbon block is basically in a state of orderly arrangement, and the resistivity is less than 15 mu m; the degree of the semi graphite carbon block is low or only partially, and the resistivity is 15 to 45 m. In the process, the heat treatment temperature, the heat treatment of the semi graphite carbon block is about 2000 degrees Celsius, and the temperature of the graphite carbon block is 2800 to 2500 degrees Celsius. Common cathode carbon block, the resistivity of 50 ~ 60 mu m. Graphite cathode carbon block China has not been applied.