Use of high-standard airtight electrode paste on nickel-iron electric furnaces
A nickel-iron electric furnace is an electric furnace that uses the resistance heating properties of nickel-iron alloy materials for heating.Electric current generates heat through the nickel-iron alloy material, thereby heating the object.In the operation process of nickel-iron electric furnaces, electrodes play a vital role. It not only needs to have good electrical conductivity, but also to maintain sufficient oxidation resistance and mechanical strength at high temperatures.As an important part of the electrode, the high-standard airtight electrode paste is particularly important in the use of nickel-iron electric furnaces.
1. Overview of high-standard airtight electrode paste
Electrode paste, also known as self-baking electrode, is a conductive material used in electric furnace equipment such as ferroalloy furnaces and calcium carbide furnaces.The high-standard airtight electrode paste has the characteristics of low ash content, low resistivity, strong thermal conductivity, oxidation resistance and corrosion resistance.This kind of electrode paste can withstand high temperatures, while having a small coefficient of thermal expansion and a small porosity, which makes the electrode in the heated state oxidize slowly.In addition, the high-standard closed electrode paste has high mechanical strength and is not easy to break due to the influence of mechanical and electrical loads.
2. Application of high-standard airtight electrode paste in nickel-iron electric furnace
In a nickel-iron electric furnace, the electrode paste is roasting through the heat in the mine heat furnace. Matching the consumption speed of the electrode with the roasting speed is the key to the use of the electrode paste.Due to the development of mine heating furnace technology, it has gradually developed in the direction of large-scale and airtight, and the heat obtained by the electrode during the roasting process has been greatly reduced, which requires improving the sintering performance of the electrode paste to make up for this deficiency.The high-standard airtight electrode paste exhibits excellent performance in the sintering process. When the sintering temperature is below 300℃, the electrode paste is in a plastic state and the mechanical strength is low; at 300-800℃, the volatile parts of the coal asphalt have been discharged, and the remaining coal asphalt has been carbonized to form a network, and the mechanical strength is significantly improved.
3. Advantages of using high-standard airtight electrode paste
Improve electrical conductivity: High-standard closed electrode paste has a low resistivity, which can effectively reduce the loss of electrical energy and improve the electrical conductivity of nickel-iron electric furnaces.
Enhanced oxidation resistance: The carbon electrode can withstand arc temperatures up to 3500℃ and only oxidizes slowly.The high-standard airtight electrode paste is made of high-quality carbon material to ensure the oxidation resistance of the electrode at high temperatures.
Improve mechanical strength: High-standard sealed electrode paste has high mechanical strength, can resist the influence of mechanical and electrical loads, and reduce the risk of electrode breaking.
Optimize the quality of electrode roasting: The height of the appropriate electrode paste column is conducive to improving the quality of electrode roasting and reducing consumption.By optimizing the particle size ratio of the high-standard airtight electrode paste, the occurrence of electrode paste suspension failure and spraying phenomenon is reduced.
4. Precautions for the use of high-standard airtight electrode paste
Control of the height of the electrode paste column: The height of the electrode paste column has an important influence on the quality of the electrode roasting.If the electrode paste is too high, the thickness of the particles in the electrode paste is prone to stratification, or the electrode cylinder is swollen due to the pressure of the paste column is too high; if the electrode paste column is too low, it is difficult to obtain a dense electrode due to the pressure of the paste column is too small and the filling is poor.
The selection and ratio of raw materials: The selection of raw materials for high-standard airtight electrode pastes has an important impact on the quality of electrode pastes.High-quality raw materials such as electro-calcined anthracite coal, calcined petroleum coke, and modified coal asphalt should be used to improve the electrical conductivity and mechanical strength of the electrode paste.
Electrode lifting and sealing: The lifting speed and sealing method of the electrode are also important factors affecting the service life of the electrode.The lifting speed of the electrode should be reasonably controlled to avoid excessive current fluctuations; at the same time, an effective sealing method should be used to prevent cold air from leaking into the furnace and affecting the roasting quality of the electrode.
