Effect of particle size distribution of electrode paste on electrode life of mine heat furnace
The specific influence of the particle size distribution of the electrode paste on the electrode life of the mine heat furnace is a multi-dimensional and complex process, which involves the sintering characteristics of the electrode paste, the electrical conductivity, and the stability of the electrode in operation.
Electrode aging and burning
During the sintering process of electrode pastes with uneven particle size distribution, due to large differences in particle size, incomplete sintering or excessive partial sintering may result.This uneven sintering state easily forms holes or pores inside the electrode.These holes and pores not only reduce the mechanical strength of the electrode, but also make the electrode more prone to stress concentration under the dual action of high temperature and current.Over time, these stress concentration points will gradually expand, eventually leading to the aging and burning of the electrode.Especially in the high-temperature and high-load operating environment of mineral heat furnaces, electrodes made of electrode pastes with uneven particle size distribution are more prone to the above problems, which seriously shortens the service life of the electrodes.
Resistance and energy consumption
The particle size distribution has a direct impact on the electrical conductivity of the electrode.When the particle size distribution of the electrode paste is uneven, the particle arrangement inside the electrode may not be tight enough, causing the current to encounter more obstacles when passing through, thereby increasing the resistance of the electrode.The increase in resistance means that at the same current, the electrode needs to consume more electrical energy to overcome these obstacles.This not only increases the operating cost of the mine heat furnace, but also accelerates the aging process of the electrode during long-term high-energy operation.Because the current generates more heat when it passes through the high-resistance electrode, these heat will further exacerbate the wear and corrosion of the electrode, thereby shortening the service life of the electrode.
Electrode stability
In contrast, electrode pastes with uniform particle size distribution can form a more stable electrode structure during sintering.This stable electrode structure not only has higher mechanical strength, but also has good oxidation resistance.During the operation of the mine heating furnace, the stable electrode structure can reduce the vibration and fracture of the electrode.Because when the electrode is subjected to high temperature and current, the uniform particle size distribution makes the stress distribution inside the electrode more uniform, thereby avoiding the appearance of stress concentration points.This uniform stress distribution helps to improve the fatigue resistance of the electrode, so that the electrode can maintain stable performance during long-term operation, thereby extending the service life of the electrode.
In summary, the influence of particle size distribution on the life of the electrode of the mine heat furnace is multifaceted, which involves a number of key factors such as the sintering characteristics, electrical conductivity and operating stability of the electrode.Therefore, in the production and preparation process of electrode paste, the particle size distribution should be strictly controlled to ensure that the electrode has excellent performance and long service life.
