What are the reasons for electrode paste leakage? How to solve it?
Electrode leakage paste refers to the molten liquid electrode paste in the electrode flowing out from the damaged electrode barrel. There are two places where paste leakage occurs: one is below the bottom ring (copper tile) and the other is above the bottom ring (copper tile).
(1) Causes of electrode paste leakage
When the electrode consumption rate is higher than the sintering rate, the electrode softening section is pressed below the conductive element (copper tile) If the electrode current exceeds the * current that the motor barrel can withstand, it will lead to flow paste or soft break.
① Poor quality of electrode paste
The volatile content and softening point of the electrode paste are too high, so that the three-phase electrode is under burnt for a long time, which cannot meet the requirements of the production process, and the electrode is pressed and discharged, resulting in paste leakage: the ash content of the electrode paste is too high, resulting in rapid electrode consumption, and the sintering speed of the electrode can not meet the consumption speed, resulting in paste leakage.
② Unreasonable pasting method
Paste is not added according to the process requirements, resulting in too high paste column, slow volatilization of volatiles and under burning of electrodes; The paste column is too high, so that the self weight of the electrode exceeds the clamping force of the electrode clamping system, causing the electrode to slide down and causing the electrode to leak paste.
③ Process operation reason
The electrode is not pressed according to the pressing length and time interval specified in the process operation specification. The one-time electrode is pressed for too long, and the electrode is continuously pressed for several times in a short time, resulting in under burning of the electrode and leakage of paste; The secondary operating current is too low, the secondary voltage is too high, the power factor is high, and the active power is large, resulting in slow sintering and fast consumption of the electrode, resulting in electrode paste leakage; The working end length of the electrode is not controlled according to the process requirements, resulting in the working end is too short, the furnace depth is shallow, the open arc operation of the electrode is strict, the electrode consumption is fast, the sintering is slow, and the paste leakage is caused when the electrode is pressed; When baking the electrode, the current and load are not increased according to the process requirements, resulting in breakdown of the electrode barrel and leakage of paste; The raw and overburned lime exceeding the standard, fixed carbon materials with low carbon content, furnace materials with unqualified particle size, low-quality qualified products and even substandard products are not added according to the indicators required by the process, resulting in rapid electrode consumption and leakage of paste when the electrode is pressed.