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Pubdate: 06-17 2021

Roasting and consumption of electrode paste on calcium carbide furnace

Baking and consumption of electrode paste on calcium carbide furnace The self-baking anode has simple manufacturing process, short production cycle and low cost, and is widely used in various furnace types in the calcium carbide industry. As the heart of the calcium carbide furnace, how to manage and operate the three-phase electrode of the calcium carbide furnace is directly related to whether the calcium carbide furnace can enter normal production. It is to increase the operation rate and output of the calcium carbide furnace, reduce various consumption indicators, and reduce various electrode accidents. And equipment accidents and even safety accidents are the key. If the three-phase electrode of the calcium carbide furnace is not strictly managed and operated in accordance with the process and operating procedures of the calcium carbide furnace, the electrode will have one or another accident, which will make the calcium carbide furnace production unable to enter the track of normal production for a long time, and the operation rate of the electric furnace will be low. The product quality is low, various consumption indicators are high, and the furnace conditions cannot be changed to normal at a time, and the situation is erratic, causing a vicious circle. At the same time, if the calcium carbide furnace is not operated in accordance with the process operating procedures, it will be difficult for the production to be normal, and the abnormal furnace conditions will also affect the orderly sintering of the three-phase electrode and cause various electrode accidents. If the three-phase electrode is not strictly managed and operated according to the calcium carbide furnace process operating procedures, serious equipment accidents and safety accidents may even occur, causing a large amount of manpower and material resources to the enterprise, and bringing huge economic losses, such as a major personal safety accident. Must close the door and stop production! In particular, the country’s vigorous adjustment, transformation and upgrading of the structure of high-energy and high-polluting enterprises, the completion and commissioning of a large number of high-tech large-capacity, fully enclosed, combined-controller calcium carbide furnaces, has improved the operation and management of three-phase electrodes. Strictly, such electric furnaces are all closed, and the furnace conditions and electrode sintering conditions cannot be observed with the naked eye. It is completely dependent on instrument monitoring and strict process regulations to judge and analyze the furnace conditions and electrode sintering conditions. Standardized management and operation are even more important!

The main causes of various electrode accidents in the calcium carbide production process are operation problems, equipment problems and electrode paste quality problems. How to scientifically manage and operate the three-phase electrodes of the calcium carbide furnace and reduce electrode accidents should start and study from the following aspects: In the process of production practice, we constantly learn experience, sum up experience, repeatedly research and form theoretical knowledge to guide production, and use production practice to test theories and find out the laws. There are three main heat sources for baking the electrode paste raw materials into carbon electrodes, which are conduction heat, radiant heat and resistance heat. Conductive heat is the conduction heat of the electrode itself. The temperature of the arc generated by the electrode tip can reach about 3500°C. The heat is transferred from the bottom to the top of the electrode itself. When the pressure discharge electrode is produced, the self-baking electrode moves from the bottom to the bottom and gradually conducts. Thermal heating and sintering into electrodes. The farther away from the arc zone, the slower the heat conduction, and the smaller the proportion of heat conduction to the sintering heat of the electrode paste. In addition to the thermal conductivity of the electrode paste after sintering, the factors that affect the conduction heat are also related to the electric energy input from the submerged arc furnace, the flow rate and temperature of the circulating water of the three-phase electrode control system. The radiant heat is the flue gas from the charge surface of the calcium carbide furnace. The flue gas temperature of the closed calcium carbide furnace is about 300~600℃, and the temperature of the open calcium carbide furnace is as high as about 700~800℃. The radiant heat is conducted from the surface of the electrode to the inside, and the electrode is heated and sintered. Radiant heat accounts for a small proportion of the electrode sintering heat in a closed furnace, and a larger portion in an open furnace. This is why the electrode sinters quickly in an open furnace. The higher the material surface temperature, the faster the electrode sinters.

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