Molybdenum Electrode Plates Must Be Installed Coldly

 

 

 

 

In order to prevent the molybdenum electrode plate from oxidizing during the baking process, the electrode should be wrapped with fiberglass cloth.
The feeding channel is protected by electrodes, and glass liquid is introduced in a short time to completely immerse the electrodes to protect the molybdenum electrode plate from oxidation.

 

The installation structure of the molybdenum electrode plate must be firm to prevent the electrode plate from falling off. Pay attention to being parallel to the bottom of the pool and maintaining good conductivity in the liquid glass.

 

In glass furnaces, molybdenum electrode plates have better performance and efficiency than molybdenum electrode rods. However, due to technical limitations, the connection method of molybdenum electrode plates was relatively simple in the past.

 

Usually, a hole is drilled in the center of the molybdenum plate to generate electricity in a spiral shape, and then the molybdenum plate and silver electrode are fixed and tightened with nuts. This installation method will increase the resistance between the electrode and the lead electrode, and it will easily loosen after being used for a period of time, causing a series of damage. If the electrode is severe, it cannot be processed and replaced.

 

As for the cooling method of electrodes, direct water cooling is often used. Water leaks easily and has a short service life. The reasons why the molybdenum electrode plate is damaged during installation and use may be as follows.

 

The forging pressure ratio of the forged bottom rod is not enough, and the cross-section grains of the molybdenum rod are uneven. In molten glass, the intergranular surface area and the strength of the molybdenum rods decrease as the molybdenum grains grow. Since the molybdenum bottom rod broke under its own gravity, the molybdenum alloy plate sank to the bottom of the pool.

The molybdenum plate is too rough in processing, and the molybdenum bolts and molybdenum nuts are tightened too much during installation, causing damage to the thread root.

In order to prevent the oxidation of sodium silicate Na2SiO3 (sodium silicate Na2SiO3), the corrosion of Mo metal at high temperature is ignored when the electrode is cold loaded.

The electrodes are installed too close to the pool bricks, causing corrosion of the pool bricks. Under the action of electrochemistry, various components in the glass liquid together with zirconium corundum, molybdenum, etc. generate black and brown dirt, contaminating the glass liquid.

Therefore, if we want to extend the service life of the electrode and improve its efficiency, we must improve the performance of the electrode material. By preparing powder metallurgy La2O3-Mo electrode plates, their recrystallization temperature should be above 1200°C, and better mechanical properties are also required.

 

In addition, the molybdenum bottom electrode and molybdenum screw should be prepared by vacuum melting method. Compared with molybdenum electrodes prepared by powder metallurgy methods, this molybdenum electrode has higher high temperature resistance and resistance to erosion by silicate and aluminum silicate solutions.