Quality control during electrode baking

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Quality control during electrode baking1-1 Control the three stages of electrode bakingThe three stages of electrode baking determine the final quality of the

Quality control during electrode baking

1-1 Control the three stages of electrode baking

The three stages of electrode baking determine the final quality of the electrode. The first stage is the melting stage from room temperature to 200°C; the second stage is the volatilization stage from 200-600°C; and the third stage is the curing stage at 600-800°C. In order to well control the firing speed of the three stages, especially the two volatilization temperatures of 500°C and 700°C, the secondary current can be intuitively controlled to ensure the normal and effective firing of the electrode.

1-2 Preparation of the electrode working end before opening the furnace

Treat the contact surface between the end of the electrode and the coke layer at the bottom of the furnace. If it is a new electrode, the steel plate at the bottom of the head should be thicker. If it is the hard tip of the electrode from the previous shutdown, the bottom of the electrode must be treated relatively flat, so that the bottom of the electrode depends on the weight of the electrode itself and the coke layer at the bottom of the furnace is evenly and steadily contacted, so as to minimize the electrode’s hands during the baking process. Inhomogeneity and the uneven firing speed of the same electrode in the electrode firing process, so as to avoid that almost all the current flows from the side that first contacts the bottom of the furnace and starts sintering, and forms the main electrode firing area, which will cause the inside of the electrode. Stress, causing electrode accidents.

1-3 Clean up the thinned area

Under normal production conditions, due to emergency power cuts, the crucible in the normal area is relatively large. However, when the furnace is shut down under the power limit, because the electric furnace does not have enough power to maintain the normal crucible area, in this case, when the furnace is shut down to clean the material and then the furnace is turned on, the area in the molten pool must be cleaned up. The purpose is to not be subjected to external force from around the crucible during the firing of the electrode, otherwise, once the electrode is subjected to external force from the crucible during the firing process, the load of the electric furnace will rise to between 16-17MW, and the hard break of the electrode will not be possible. avoid.