Submerged Arc Furnace Graphite Electrode VS Self-baking Electrode VS Carbon Electrode
The submerged arc furnace graphite electrode is mainly used to produce ferroalloy, pure silicon, yellow phosphorus, matte and calcium carbide, etc. Its characteristic is that the lower part of the conductive electrode is buried in the charge, so in addition to the heat generated by the arc between the electric plate and the charge, the current Heat is also generated by the resistance of the charge as it passes through. Each ton of silicon needs to consume about 150kg of graphite electrodes, and each ton of yellow phosphorus needs to consume about 40kg of graphite electrodes.
The difference between self-baking electrodes, carbon electrodes, and graphite electrodes for submerged arc furnaces.
The role of the electrodes is to conduct electricity and convert electrical energy into heat. Electrodes are divided into carbon electrodes, graphite electrodes, and self-baking electrodes according to their uses and production processes. In submerged arc furnaces, self-baking electrodes are mainly used because of their low cost, but when producing ferroalloy products with lower carbon content, such as industrial silicon, graphite electrodes are required. The differences between self-baking electrodes, carbon electrodes, and graphite electrodes are as follows:
- The carbon electrode is made of low-ash anthracite, metallurgical coke, pitch coke, and petroleum coke as raw materials, and is composed of a certain proportion and particle size. When mixing, add binder pitch and tar, and stir evenly at a suitable temperature. , and then slowly roasted in a roaster.
- The submerged arc furnace graphite electrode is made of carbon electrode with petroleum coke and pitch coke as raw materials, and then placed in a graphitized resistance furnace with a temperature of 2000~2500 ℃, and the graphite electrode is obtained by graphitization.
- The self-baking electrode uses anthracite, coke, pitch, and tar as raw materials to make electrode paste at a certain temperature, and then put the electrode paste into the electrode shell that has been installed on the electric furnace. During the production process of the electric furnace, when the electric current passes through The Joule heat is generated and the heat transfer in the furnace is self-sintering and coking. This kind of electrode can be used continuously, and it can be sintered and formed at the same time as long as it is used, and it can be fired into a self-baking electrode with a large diameter.
The self-baking electrode has a simple manufacturing process and low cost and is widely used in the production of ferroalloys. It is usually used to produce ferrosilicon, silicon-chromium alloy, silicon-manganese alloy, high carbon ferromanganese, medium and low carbon ferromanganese, high carbon ferrochromium, medium and low carbon ferrochromium, silicon calcium alloy, ferrotungsten, etc. Self-baking electrodes are easy to carbonize the alloy, and the iron sheet of the electrode shell also easy to brings iron into the alloy, so the production of iron alloys and pure metals with very low carbon content, such as micro-carbon ferrochromium, industrial silicon, silicon-aluminum alloy, metal manganese, etc., use carbon electrode or submerged arc furnace graphite electrode.