Electrode paste crushing strength is a useful measure for the physical properties of Carbon & Graphite Electrode. This is an important material used in Electric Arc Furnaces. It conducts current from transformers to metallurgical reaction zones. The continuous self-baking electrode, also known by the name of a Soderberg, is at the heart of many ore reduction furnaces around the world.
The electrode paste must meet very high standards of quality to achieve the high performance demanded by electric/submerged furnaces. This is why it is subjected to strict production controls. The five key properties of the electrode paste that are of crucial importance for its quality and performance are electrical resistance, bulk density, ash content, porosity and crushing strength.
Carbon electrode paste can be made by mixing Calcined Petroleum coke (CPC) with Electrically Calcined Anthracite (ECA), impregnated in selective coal tar, and then forming electrodes. These electrodes are then fed directly into the smelting kilns as self-baking electrodes. Carbon electrodes are supplied as cylinders or briquettes of different sizes depending on the size of the furnace.
In order to manufacture the electrode, the CPC and ECA are crushed and screened into different fractions and then mixed according to the specific formulation of the electrode paste with a Sigma type mixer and preheated at 1800C to a temperature above its melting point. A certain amount of liquid coal pitch is added to the paste according to its viscosity specification.
The electrode paste is then kneaded into a cylinder or briquette. Both are cooled to temperatures below boiling point. The smelting begins when the electrode is fed into the electrode columns of the electric/submerged-arc furnace as a cylinder, or briquette.
As the electrode moves downward, the thermal expansion in the briquette causes the briquettes to soften. The briquette is baked until it becomes a solid, continuous carbon electrode. This conducts the current of the transformer into the metallurgical response zone of electric/submerged arc furnace.
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