The principle of carbon electrodes for furnaces mainly includes its manufacturing process, conductive properties, and usage scenarios.
Manufacturing process
Carbon electrodes are made of low-ash anthracite, metallurgical coke, asphalt coke, and petroleum coke, and are composed in a certain proportion and particle size. Binders asphalt and tar are added during mixing, and then pressed into shape after being stirred evenly at an appropriate temperature, and finally slowly baked in a roasting furnace to obtain.
Conductive properties
Carbon electrodes have good conductivity and low resistivity, which can reduce the loss of electric energy and short-circuit voltage drop, increase the effective voltage, and thus increase the molten pool power.
In addition, carbon electrodes have sufficient mechanical strength and low thermal expansion coefficient at high temperatures, can remain stable when the temperature changes, and are not easy to deform.
Usage scenarios
Carbon electrodes are widely used in the submerged arc furnace industry, mainly for ferroalloy smelting. For example, self-baking electrodes are widely used in the production of ferrosilicon, silicon-chromium alloy, manganese-silicon alloy, high-carbon ferromanganese, high-carbon ferrochrome, medium-low carbon ferromanganese, medium-low carbon ferrochrome, silicon-calcium alloy, tungsten iron, etc. However, self-baking electrodes easily increase the carbon content of alloys. Therefore, when producing iron alloys and pure metals with very low carbon content, such as micro-carbon ferrochrome, industrial silicon, silicon-aluminum alloy, and metallic manganese, carbon electrodes or graphite electrodes should be used.