Electrode paste plays a crucial role in building carbon electrodes inside electric arc kilns. The unique composition of the electrode paste, which consists primarily of calcined petrol coke (CPC), pitch coke, anthracite electrically calcined and coal tar, along with additional materials, maximizes performance and efficiency in all steel-making processes.
The high carbon content of the paste, derived from calcined petroleum coke and calcined anthracite, ensures that current can pass easily and efficiently through the electrode during the production process and during operation in the submerged arc furnace (EAF). The coal tar pitch binder provides the paste with sufficient mechanical strength to endure the manufacturing process and operating conditions in the EAF.
The paste is able to withstand extreme temperatures generated by the EAF or other carbon electrode applications due to its excellent thermal stabilty. The coal tar pitch binder also facilitates adhesion between the carbon particles and prevents them from disintegrating in the manufacturing process or during use.
Incorporated into the paste are various additives, such as anti-oxidation agents (antioxidants), surfactants (surfactants) and plasticizers. Addition of these additives makes the paste easier to apply to the electrode during production. The phenolic based resin used to make Soderberg's paste is waterproof. It increases durability and reduces the frequency of replacements.
The amount of water in a carbon paste electrode determines its conductivity. In order to increase the viscosity of the carbon paste electrode, manufacturers will add lubricants like petroleum jelly or paraffin. This increases the electrode's flexibility, allowing it to conform more easily to irregular surfaces. Additionally, lubricant helps to reduce friction between the electrode, arc and the lubricant, which, in turn, improves the electrode’s conductivity.
Carbon paste electrodes are more resistant to heat and stress during arc welding due to their superior conductivity. This helps to reduce the risk of burning and other damage on the workpieces. In addition, carbon paste electrodes are easy to fabricate and can be customized for different applications, such as detecting volatile organic compounds (VOCs) or biological species.
The conductivity of a carbon paste can be used to detect VOCs and then analysed by technicians in the lab for quality control. This type electrode is also effective for identifying various toxins, like volatile organic compounds. Electrode Pastes are also easily cleanable and can be wiped with water. This makes them a very reliable and economical way to measure VOCs. The same technology also can be used in a variety other industrial hazards and environmental contaminants.
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