Roasting of Tanlin Carbon Electrode Paste in Calcium Carbide Furnaces
Roasting Principle The roasting of Tanlin Carbon electrode paste in a calcium carbide furnace is a complex physico-chemical process. Once loaded into the electrode cylinder, the binder in the paste undergoes decomposition, polymerization, and carbonization reactions in the high-temperature furnace. These reactions bond solid particles like anthracite and metallurgical coke together, transforming the paste into a solid electrode with high strength and good conductivity. Temperature is crucial, as different ranges trigger different reactions that determine the electrode’s final performance.
Roasting Stages
Low-temperature Stage (Room Temperature – About 300℃) The main task is to remove moisture and low-boiling-point volatiles. The heating rate should be slow. Rapid heating can cause water to evaporate quickly, creating pores in the electrode and affecting its quality. If moisture isn’t removed properly, the electrode may burst in the high-temperature stage.
Medium-temperature Stage (About 300℃ – 800℃) The binder decomposes and polymerizes, releasing a lot of volatile substances. Strictly controlling the heating rate is essential. A sudden release of volatiles can increase internal pressure, leading to electrode expansion or cracking. This stage is critical for the electrode’s performance, and Tanlin Carbon provides operation guidance to ensure a smooth transition.
High-temperature Stage (About 800℃ – 1200℃ and Above) The binder continues to carbonize, enhancing the electrode’s strength and conductivity. Maintaining an appropriate high-temperature holding time is necessary for full carbonization and optimal performance. Tanlin Carbon’s electrode paste shows good stability and consistency in high-temperature roasting, adapting to different furnace environments.
Factors Affecting Roasting
Electrode Paste Quality Tanlin Carbon electrode paste stands out for its high quality. It uses carefully selected binders and solid particles with uniform size distribution. This ensures a smooth roasting process and high-performance electrodes. Compared to lower-quality pastes, Tanlin Carbon’s product has strict quality control from raw material selection to production, guaranteeing consistent quality.
Furnace Condition Stability The uniformity and stability of the furnace temperature field are vital for roasting. Frequent temperature fluctuations can disrupt the process, causing local over-roasting or under-roasting, which affects the electrode’s quality and lifespan. Tanlin Carbon’s technical team helps customers optimize furnace conditions to ensure stable roasting.
Electrode Working Length Proper control of the electrode working length is important. If it’s too long, the lower part may be too cold for full roasting. If it’s too short, the electrode will consume quickly, increasing costs and affecting production continuity. Tanlin Carbon offers professional guidance on setting the right working length for optimal results.
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