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The causes of soft and hard fracture of electrode in calcium carbide furnace

The causes of soft and hard fracture of electrode in calcium carbide furnace

  • 12-30
Analysis on the causes of soft and hard fracture of electrode in calcium carbide furnace

Analysis on the causes of soft and hard fracture of electrode in calcium carbide furnace

 1.Cause analysis of soft break of calcium carbide furnace electrode

The sintering speed of the electrode is lower than the consumption rate. After the unfired electrode is put down, it will cause the electrode to break softly. Failure to evacuate the furnace operator in time may cause burns. The specific reasons for electrode soft break are:

 

1.1 Poor electrode paste quality and excessive volatiles.

 

1.2 The electrode shell iron sheet is too thin or too thick. Too thin to withstand large external forces and rupture, causing the electrode barrel to fold or leak and soft break when pressed down; too thick to cause the iron shell and the electrode core not to be in close contact with each other and the core may cause Soft break.

 

1.3 The electrode iron shell is poorly manufactured or the welding quality is poor, causing cracks, resulting in leakage or soft break.

 

1.4 The electrode is pressed and put too frequently, the interval is too short, or the electrode is too long, causing a soft break.

 

1.5 If the electrode paste is not added in time, the electrode paste position is too high or too low, which will cause the electrode to break.

 

1.6 The electrode paste is too large, careless when adding the paste, resting on the ribs and being overhead, can cause soft break.

 

1.7 The electrode is not sintered well. When the electrode is lowered and after it is lowered, the current cannot be properly controlled, so that the current is too large, and the electrode case is burned and the electrode is softly broken.

 

 

1.8 When the electrode lowering speed is faster than the sintering speed, the pasting segments in the shaping are exposed, or the conductive elements are about to be exposed, the electrode case bears the entire current and generates a lot of heat. When the electrode case is heated above 1200 ° C, the tensile strength is reduced to Can not bear the weight of the electrode, a soft break accident will occur.

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2.Cause analysis of hard break of calcium carbide furnace electrode

When the electrode is broken, if the molten calcium carbide is splashed, the operator has no protective measures and failure to evacuate in time may cause burns. The specific reasons for the hard break of the electrode are:

 

 

2.1 The electrode paste is usually not properly stored, the ash content is too high, more impurities are entrained, the electrode paste contains too little volatile matter, premature sintering or poor adhesion, causing the electrode to hard break.

 

 

 

2.2 Different electrode paste ratios, small binder ratio, uneven mixing, poor electrode strength, and unsuitable binder. After the electrode paste is melted, the thickness of the particles will delaminate, which reduces the electrode strength and can cause the electrode to break.

 

 

 

2.3 There are many power outages, and the power supply is often stopped and opened. In the case of power failure, necessary measures have not been taken, resulting in electrode cracking and sintering.

 

 

 

2.4 There is a lot of dust falling into the electrode shell, especially after a long period of shutdown, a thick layer of ash will accumulate in the electrode iron shell. If it is not cleaned after power transmission, it will cause electrode sintering and delamination, which will cause Electrode hard break.

 

 

 

2.5 The power failure time is long, and the electrode working section is not buried in the charge and severely oxidized, which will also cause the electrode to hard break.

 

 

 

2.6 The electrodes are subject to rapid cooling and rapid heating, resulting in great internal stress differences; for example, the temperature difference between the electrodes inserted inside and outside the material during maintenance; the temperature difference between the inside and outside of the contact element is large; uneven heating during power transmission can cause Hard break.

 

 

 

2.7 The working length of the electrode is too long and the pulling force is too large, which is a burden on the electrode itself. If the operation is careless, it may also cause a hard break.

 

 

 

2.8 The amount of air supplied by the electrode holder tube is too small or stopped, and the amount of cooling water is too small, which causes the electrode paste to melt too much and becomes like water, causing the particulate carbon material to precipitate, affecting the sintering strength of the electrode, and causing the electrode to hard break.

 

 

 

 

2.9 The electrode current density is large, which can cause the electrode to hard break.

 

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