Understanding of soft breakage for electrode at SAF Furnace 1

 A large-scale production accident in the production of calcium carbide when the electrode is softly broken, but it can be avoided if preventive measures are in place. In production, when the electrode is softly broken, it will cause great danger and injury to equipment, production, and especially personal safety.

1. The phenomenon of electrode soft-breaking. When the leakage of paste in the production causes soft-breaking, the ammeter on the operation interface of the central control room suddenly rises or the current drops instantly after a sudden rise. The voltage of the electrode to the furnace bottom drops to "0". At the same time, the electrode tube on the fourth floor emits a large amount of black smoke or yellow smoke from the inside of the shield, and the temperature of the furnace gas outlet suddenly rises, and the pressure in the furnace increases suddenly. In severe cases, the electrode paste in the electrode tube will flow out, and the furnace gas will flow from the electrode tube. Spilled and exposed to oxygen will explode, causing injury and damage to personnel and equipment.


2. Reasons for the soft breakage of the electrode The reasons for soft breakage of the electrode can be roughly divided into the following points:

l  1. The quality of the electrode paste is unqualified, the ash content is high, the volatile matter is too large, and the softening point is high. When the ash content is high, the electrode is easy to delaminate, causing the local current to withstand weakly, so that the current pierces the electrode cylinder and causes leakage. If it is not found in time, the electrode will not be sintered easily, causing the electrode to become soft. After the electrode is pressed and discharged, the current is too large to pierce the electrode barrel; when the softening point is high, the electrode paste will soften too slowly, and the electrode will be soft. .

l  2. Whether the particle size of the electrode paste is appropriate will also cause the electrode to leak and cause soft disconnection. If the particle size of the electrode paste is too large or too small, the irregular addition will cause the shed paste or overhead, which will cause the electrode to stratify. After the electrode is pressed and discharged, the current will pierce the electrode cylinder, which will also cause the electrode paste to leak and cause soft disconnection.

l  3. The welding quality of the electrode barrel is unqualified. When the welding quality of the electrode barrel is poor, add electrode paste, and the electrode paste will flow out from the weld after being heated and softened, causing continuous electric stab fire. In severe cases, the electrode barrel will puncture and break directly.

l  4. The firing speed of the electrode is lower than the pressure and release speed, so that the electrode under pressure is not fired properly, and the current is too large to withstand the range of the electrode. The electrode cylinder is pierced to cause the liquid electrode paste that is not sintered to flow out to form a leaking paste, resulting in softness. Off. 5. When the water content of the raw material is too large, it will cause collapse, and the flame will burn the insulating device and the sealing device on the electrode, forming a continuous electric stab fire, piercing the electrode cylinder and flowing out of the liquid electrode paste, causing soft breakage. At the same time, when the flame emerges, the tar in the carbon material will be taken out and adsorbed on the contact element, and after the temperature is reduced, it will condense into a block, which will also form a thorn fire and puncture the electrode tube, causing the electrode tube to leak and softly break.



Contact info:

Email: carbongraphiteproduct@gmail.com

whatsapp: +8614738833543


Henan Rongxin Carbon Group

　　Rongxing Group is China’s leading supplier dedicated to providing its customers with the quick quotes, superior quality products, competitive prices and fastest possible deliveries of carbon metallurgical materials and solutions.

　　Its main products are graphite electrode，electrode paste, calcined petroleum coke, and refractory. The range of product line covers carbon materials, graphite materials, refractory and water treatment materials. The annual production capacity of graphite electrode, electrode paste, calcined coke and refractory reaches 50,000 tons, 200,000 tons, 250,000 tons and 20,000 tons respectively. The company’s corporate headquarters is currently located in the Zhengzhou.

　　As an experienced supplier, we now offer everything from RP, HP to UHP graphite electrode and trapezodial, oval, cylinder electrode paste in the world. Our products meet and exceed the challenges of thousands of applications, and continue to be innovated.


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