Baking of self-baking electrodes
In the smelting process, with the consumption and lowering of the electrodes, it is necessary to continuously add electrode paste and continuously extend the electrode barrel from the upper part. In this process, the height of the paste column must be controlled well to fire a good quality sintered electrode.
The self-baking electrode baking process can be roughly divided into the following three stages according to the baking temperature and location:
1. Softening section
2. Volatile section
3. Sintering section
How to judge the quality of electrode sintering
If it is found that the surface of the lowered electrode is grayish white, dark but not red or reddish, it means that the firing is good; if the surface of the lowered electrode is red, it has been overfired; if the surface is black, it means that the firing is insufficient. It can also be judged according to the smoke from the electrode when the electrode is put down. For example, a small amount of white smoke on the electrode when it is put down is normal; smokeless means overburning; thick smoke means underburning. In addition, you can also use the round steel to test the electrode that has just been put down on the lower edge of the copper tile. If it is very hard, it can bounce back to indicate overheating; if it is elastic, it is normal; if it is soft, it indicates underburning.