Graphite electrodes include:

(1) ordinary power graphite electrode

The graphite electrode with current density lower than 17A/ cm 2 is allowed to be used, which is mainly used in ordinary power electric furnaces such as steel making, silicon smelting and yellow phosphorus smelting.

(2) oxidation resistant coated graphite electrode

Graphite electrode coated with a protective layer of antioxidant (graphite electrode antioxidant). Form both conductive and high temperature oxidation resistant protective layer, reduce the electrode consumption in steelmaking (19%~50%), prolong the service life of the electrode (22%~60%), reduce the electrical energy consumption of the electrode. The spread of this technology can bring about the following economic and social effects:

① The unit consumption of graphite electrode is less, and the production cost has a certain reduction. A certain steel works, for example, not the year production level of LF refining furnace 35 root graphite electrode per week, 165 furnace refining processing consumption calculation, using graphite electrode after oxidation technology, can save 373 a year (153 tons) electrode, a year uhp electrode is 16900 yuan per ton, 2.5857 million yuan can be saved.

② The graphite electrode consumes less power, saves the unit steelmaking electricity consumption, saves the production cost, saves energy!

(3) Due to the less frequency of graphite electrode change, less labor and risk factor of the operator, improve the production efficiency.

(4) Graphite electrode is low consumption and low pollution products, in today's energy conservation, emission reduction and environmental protection advocate, has very important social significance.

This technology is still in the stage of research and development in China, and some domestic manufacturers have begun to produce it. In Japan and other developed countries have been more widely used. At present, there is also a special import of this kind of antioxidant protective coating company.

(3) High power graphite electrode

Graphite electrodes with a current density of 18 to 25A/ cm 2 are allowed, mainly used in high-power electric arc furnaces for steelmaking.

(4) ultra-high power graphite electrode

Graphite electrodes with current densities greater than 25A/ cm 2 are allowed. Mainly used in ultra-high power steel - making arc furnace.