ZHENGSHAN TECHNOLOGY

Accidents in the soft and hard sections of the electrode paste roasting in the mine thermal furnace mainly include hard electrode breakage and soft electrode breakage. These accidents will seriously affect production efficiency and equipment safety.In order to reduce such accidents, the following measures can be taken：

1. Prevention and treatment of electrode hard breakage

Strictly control the working length of the electrode：
Measure the length of the electrode regularly to ensure that the working length of the electrode is within a reasonable range (such as 1800~2000mm) to avoid being too long or too short.
If the electrode is too long, the pressure-release time can be appropriately extended and the ratio of the phase electrodes can be adjusted.
Strengthen the quality management of electrode paste：
Regularly check the quality of the electrode paste, including ash, oil, particle size and other indicators, to ensure that the electrode paste meets the process requirements.
Choose the appropriate electrode paste formula to improve the strength and resistance of the electrode to cold and heat.
Optimize smelting operations：
During the power transmission to increase the load, the load should be gradually increased according to the maturity of the electrode to avoid the load increasing too quickly and causing the electrode to break hard.
Regularly check whether the clamping force of the electrode contact element is appropriate to ensure that the electrode remains stable during the roasting process.
Do a good job of electrode insulation：
After the power failure and maintenance, the electrode should be kept in a state of thermal insulation as much as possible, and the electrode should be buried with materials to prevent oxidation of the electrode.
After power transmission, the load should not be increased too quickly to avoid cracks in the electrode due to rapid temperature changes.
Deal with electrode hard break accidents in a timely manner：
Once the electrode is hard broken, the power should be cut off immediately, the hard broken head should be pulled out or as low as possible into the charge, and the “dead phase” roasting should be carried out.
Roasting electrodes of a certain length according to the situation, and speeding up the consumption speed of the phase electrode head.

2. Prevention and treatment of soft electrode breakage

Avoid under-burning of electrodes：
During the electrode roasting process, it is necessary to ensure that the electrode is fully sintered to avoid soft breakage caused by under-burning of the electrode.
The sintering speed of the electrode can be controlled by adjusting the height of the electrode paste column and increasing the air volume of the cooling electrode.
Strengthen the inspection and maintenance of electrode holding facilities：
Regularly check whether the electrode holding facility is in good condition to ensure that the electrode will not slide down due to the failure of the holding facility during the roasting process.
If there is a problem with the electrode holding facility, it should be repaired or replaced in time.
Deal with electrode soft break accidents in a timely manner：
Once the electrode is softly broken, the power should be cut off immediately, the electrode cooling fan should be turned on to full air volume, and the electrode cylinder should be checked for damage.
If the electrode head and the electrode shell are not misplaced, the electrode can be seated down, the electrode hard head can be re-inserted into the electrode shell, and the electrode can be calcined after a certain amount of pressure is placed.
If the electrode head is misplaced with the electrode shell and cannot be reset, you should consider pulling out the electrode head, re-welding the bottom of the electrode shell, adding a new electrode paste, and roasting the electrode.

3. Other comprehensive measures

Improve the grade of raw materials：
Choose carbon materials with high carbon content, low ash content, low moisture, low sulfur dioxide, low volatile content and reasonable particle size as electrode raw materials.
Improve the pass rate of ingredients and ensure the quality of materials before entering the furnace.
Strengthen baking operation and maintenance：
Open the furnace on time and block the furnace eye on time to avoid damage to the electrode caused by frequent adjustment of the position of the furnace eye.
Maintain the stable operation of the electric furnace, reduce the working length of the inspection door detection electrode and the frequency of hard shell and ash accumulation on the material surface during operation.
Optimize electric furnace parameters：
Adjust the electrical parameters and geometric parameters of the electric furnace according to the operation of the furnace to ensure the stable and efficient operation of the electric furnace.
Withstand the appropriate flow-pressure ratio for closed-arc production, increase the charge-to-material ratio resistance, and achieve the design operating power.

Reducing accidents in the soft and hard sections of electrode paste roasting in mine thermal furnaces needs to start from many aspects, including strengthening the quality management of electrode paste, optimizing smelting operations, doing a good job in electrode insulation, dealing with electrode accidents in a timely manner, and improving the grade of raw materials and optimizing the parameters of the electric furnace.The implementation of these measures will help to improve the roasting quality and production efficiency of electrodes, and reduce the probability of accidents in the soft and hard sections.