Carbon electrode is a carbonaceous conductive material made of electric calcined anthracite, petroleum coke, crushed graphite, coal tar pitch and other main raw materials through batching, molding, roasting and mechanical processing. As a conductive electrode for submerged arc furnace, it can be widely used in industrial silicon, ferroalloy, calcium carbide, yellow phosphorus and other metal or non-metal smelting processes.
Carbon electrode can be divided into two categories according to its application environment: grade s is ordinary carbon electrode, which is suitable for submerged arc furnace for producing metal silicon, yellow phosphorus, ferroalloy, calcium carbide, corundum and other products; Class G is a special carbon electrode, suitable for the production of appeal products in submerged arc furnaces with high current load.
As a conductive electrode for submerged arc furnace, carbon electrode has obvious comparative advantages in reducing cost, energy saving and emission reduction, improving smelting efficiency and safety. At the same time, its physical and chemical indicators can fully meet the requirements of downstream industries, so it has great potential to replace graphite electrode and electrode paste.
Compared with carbon electrode, the price of electrode paste is lower, but its impact on the environment cannot be ignored. For environmental reasons, electrode paste is gradually being eliminated; Although the graphite electrode has good safety performance, it is expensive and difficult to prepare large diameter. Therefore, the use of carbon electrode in large-scale submerged arc furnace is high.
The advantages of carbon electrode in production and application are mainly reflected in the following points:
First, because the production of carbon electrode does not need to go through the graphitization process, its cost is lower than that of graphite electrode. On the one hand, the construction cost of graphitization workshop is high, and the subsequent problems such as capacity increase cost and power supply are involved; On the other hand, graphitization consumes a lot of power. The power consumption per ton of products is 4500kwh, and the cost per kilowatt hour is calculated at 0.6 yuan, which increases by 2700 yuan per ton. Therefore, the carbon electrode does not need graphitization, and its price is lower than that of the graphite electrode.
Secondly, on the submerged arc submerged arc furnace with the same capacity, the diameter of carbon electrode can be larger than that of graphite electrode (it can be produced in China now) Φ 780- Φ 1400mm carbon electrode and graphite electrode can only be used in China Φ 700mm), so that the arc belt in the furnace is widened, the arc line is stable, the hot melting efficiency is ensured, the product output is increased, and the power consumption of the product is reduced.
Thirdly, compared with the electrode paste, the carbon electrode has low resistivity, low electrode self consumption, high bulk density, low ash content, good oxidation resistance and obvious power saving. It can improve the thermal efficiency of the submerged arc furnace, shorten the smelting time and improve the output. And it is easy to produce hollow carbon electrode, which is convenient for ferroalloy enterprises to add various raw materials at any time.
Secondly, the electrode paste is put into the electrode shell that has been installed on the furnace during the use. During the production process, a large amount of asphalt smoke will be emitted, seriously polluting the environment and affecting human health. Energy saving and emission reduction is the general trend, so it is imperative to replace the electrode paste with carbon electrode.
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