Electrical conductivity of ramming paste
Electrical conductivity of ramming paste
As a part of cathode lining, the electric conductivity of ramming paste directly affects the energy consumption of aluminum electrolysis and the life of electrolytic cell. Most adhesives containing carbon pastes are electrical insulators in the liquid st
As a part of cathode lining, the electric conductivity of ramming paste directly affects the energy consumption of aluminum electrolysis and the life of electrolytic cell. Most adhesives containing carbon pastes are electrical insulators in the liquid state, and the conductivity of a paste containing liquid adhesives will depend on the contact between particles in the material. With the increase of temperature, the carbonization of binder and the resistivity of paste decreased significantly.
The resistivity is related not only to the properties of the material itself, but also to the density of the paste. Generally decreases with the increase of density of raw, mainly due to the increased compression of paste, makes the raw density increases, the contact area between particles increase, but to a certain degree, resistivity, instead of being too big change increases slightly, this may be due to over ramming particles in the material are crushed by binder produced no wetting of the surface of the new particle, during roasting, they almost Unable to bond to the rest of the paste, cracks or delamination occur, thus disrupting the path of the current.
According to the actual production situation, the peripheral paste is usually not required to conduct electricity in order to reduce the bypass current, facilitate the formation of leg and furnace side, and improve the current efficiency. The bottom carbon block connection paste must conduct electricity, especially the steel rod paste should have as high conductivity as possible, which is conducive to the uniform distribution of current at the bottom of the tank, reduce local current peak, thereby reducing local accelerated corrosion, and prolong the life of the tank.
It should be noted that the resistivity of the joint filling paste should generally be a little higher than that of the matching charcoal block, because sodium erosion and electrochemical corrosion decrease as the current density decreases, thus protecting the ramming joint from erosion.
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