Electrode paste is the only important filling material for self-baking electrodes, and its product quality directly affects the sintering quality and use effect of the electrode. Therefore, the quality of the electrode paste products used in the enclosed calcium carbide furnace has been continuously higher. Because it is not only to achieve the index problem of reducing the consumption of electrode paste, but also to ensure the safe production of calcium carbide furnace. The electrode paste consumption index directly reflects the overall technical level of calcium carbide furnace operation and management, and is one of the important technical indicators that specifically reflects the comprehensive benefits of calcium carbide production. How to strengthen the electrode management of calcium carbide furnace, avoid and put an end to the occurrence of electrode accidents, and reduce the consumption of electrode paste in the enclosed calcium carbide furnace has become another key technical research topic for energy saving, consumption reduction and safe production of large and medium-sized fully enclosed calcium carbide furnaces.
1.1 Product quality of electrode paste
The quality of the electrode paste directly affects the baking quality and consumption indicators of the electrode, and it also affects the safe and stable operation of the furnace.
Ash content is a strictly controlled quality index, because it has a direct impact on the firing speed, electrical conductivity, oxidation resistance, sintering density, and consumption speed of the electrode. Strictly controlling the ash quality index of the electrode paste is particularly critical, while avoiding The lower the ash content, the better the misunderstanding. It is not that the lower the ash content, the better. The ash content is too low, and the firing strength of the electrode is not enough. Too high ash content will easily cause the electrode to hardly break, which will increase the consumption of electrode paste. Reasonably control the product quality of electrode paste to ensure long-term stable operation of calcium carbide furnace.
1.2 Electrode accident
The main reason for the electrode soft and hard broken accidents in the operation and management of the calcium carbide furnace is that some operation details have not been caused enough in the electrode management work. Due to improper operation when adjusting the electrode, electrode accidents are prone to occur during the firing of the electrode, which destroys the thermal balance of the electrode firing , It is quite difficult to re-establish a normal roasting order. In addition, the electrodes that are forcedly baked under high current conditions have higher quality porosity and poor mechanical strength, and their consumption speed will increase. Due to the frequent thermal shutdown due to electrode accidents, the production of calcium carbide is reduced, and the consumption of electrode paste is greatly affected. Electrode accidents are a major factor affecting the high consumption of electrode paste.
1.3 Height of electrode paste column
The height of the electrode paste column refers to the height of the electrode paste from the upper end of the conductive member of the electrode to the range of the electrode paste addition height control line. The ideal paste column height control range of calcium carbide furnace is 3.5 m～4.5 m from the upper end of the conductive element. If the control of the electrode paste column is too low, it is easy to cause over-speed sintering, and the sintered layered tensile strength of the electrode is likely to be attenuated in the electrode shell, which will bury hidden dangers to the electrode hard fracture accident; due to the low control of the electrode paste column, the unit area bears pressure Decrease, the sintered density of the electrode becomes smaller, and the consumption of electrode paste will inevitably increase. Therefore, strictly controlling the height of the electrode paste column, ensuring good firing of the electrode, avoiding and reducing electrode accidents to the greatest extent, is essential for reducing the consumption of electrode paste in a closed calcium carbide furnace.