The electrode is the key part of the ferroalloy ore furnace, and keeping the electrode in a normal state is of great significance to ferroalloy enterprises. The
The electrode is the key part of the ferroalloy ore furnace, and keeping the electrode in a normal state is of great significance to ferroalloy enterprises. The common occurrence of electrode accidents is the hard paste of the electrode paste, and a large part of the hard electrode break is caused by the partial segregation of the particles during the sintering process of the electrode, which causes the local strength to be low.
The main reasons for the segregation of electrode paste are as follows:
1. Influence of electric furnace operation
1.1 The current density is too large, the electric furnace is often in overload operation, and the resistance heat generated when the current passes through the electrode is large, and the temperature distribution on the electrode cross-section is moved upward.
1.2 The amount of air supply in the electrode holding cylinder is small or stopped, the amount of circulating water in the copper tile is small, the temperature of the outlet water is high, the conductive cordboard is not cooled enough, and the electrode paste melts like water.
1.3 The operation of the electric furnace is abnormal, the open arc operation, the scorch is serious, the radiant heat of the furnace mouth and the gas convection heat increase, and the electrode paste melts too quickly after being added.
2. Effect of electrode paste characteristics
Scientists in the former Soviet Union conducted an in-depth study on the migration process of asphalt. They believe that the coarser the particle size composition, the easier the binder will migrate at the same temperature, and the binder content under the same temperature and the same particle size composition The more, the greater the degree of migration, the lower the asphalt softening point, the greater the degree of migration.
Actual experiments also prove that the above conclusions are correct. The electrode paste softens prematurely. The lower the softening point of the electrode paste, the easier it is to separate large particles. There are two main reasons for the low softening point:
1. The size of the electrode paste particles is too large, and the amount of large particles is too much.
2. Asphalt softening point is too low, volatile content is large
shengmiao
Harm of too high temperature: when molten steel out of cooper mold, the billet shell is thin and easy to break out; The accelerated erosion of refractory can ea
shengmiao
1. The barrier function (mainly completed by the liquid slag layer) isolates the contact between air and molten steel, blocks the secondary oxidation of molten
shengmiao
In continuous casting, low corrosion resistance often occurs, which directly leads to uneven composition and will eventually affect the smelting quality. In or