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What is the difference between a self-baking electrode and a graphite electrode in a submerged arc furnace?
Dec 24, 2018

The role of the electrodes is to conduct electricity and convert electrical energy into heat. The electrode is divided into three types according to its use and manufacturing process: carbon electrode, graphite electrode and self-baking electrode. In a submerged arc furnace, a self-baking electrode is mainly used, but in the production of a low-carbon iron alloy product, such as industrial silicon, a graphite electrode is required. So what is the difference between a self-baking electrode and a carbon electrode and a graphite electrode?

First we have to distinguish between the three electrodes.

1. The carbon electrode is made of low-ash anthracite, metallurgical coke, pitch coke and petroleum coke. It is composed of a certain proportion and particle size. When mixed, the binder asphalt and tar are added, and the mixture is uniformly stirred at a suitable temperature. Finally, it is prepared by slowly roasting in a roaster.

2. The graphite electrode is made of petroleum coke and pitch coke as carbon raw materials, and then placed in a graphitized electric resistance furnace with a temperature of 2000~2500 °C, which is obtained by graphitization.

Graphite electrode

3. The self-baking electrode is made of anthracite, coke, asphalt and tar as raw materials, and the electrode paste is prepared at a certain temperature, and then the electrode paste is placed in an electrode shell which has been installed on the electric furnace, and the electric current is passed through during the electric furnace production process. The generated Joule heat and heat transfer in the furnace are self-sintered and coked. Such an electrode can be used continuously, and can be sintered by using a long side and can be fired into a large diameter.

The self-baking electrode has a simple manufacturing process and low cost, and is widely used in the production of ferroalloys. Usually used to produce ferrosilicon, silicon chromium alloy, silicon manganese alloy, high carbon ferromanganese, medium and low carbon ferromanganese, high carbon ferrochrome, medium and low carbon ferrochrome, silicon calcium alloy, tungsten iron and so on. The self-baking electrode tends to carbonize the alloy, and the electrode shell iron is also easy to bring the alloy into the iron, so the production of iron alloys with low carbon content and pure metals, such as micro-carbon ferrochrome, industrial silicon, silicon-aluminum alloy, metal manganese, etc. Prime electrode or graphite electrode.

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