A common problem in the production of ferronickel alloy by submerged arc furnace is that the self baking electrode is sintered slowly, and the electrode sintering speed is far lower than the electrode consumption speed, resulting in the working end of the electrode being too short. After tapping, the electrode can not reach the full load power supply even at the lower limit. In order to make the electrode reach the normal consumption speed, various manufacturers have developed different kinds of electrode pastes to improve the sintering speed of the electrode, but they have not fundamentally solved the problem of under burning of the electrode, and also increased the production cost.
Some manufacturers changed the power supply system on the premise that the transformer power was unchanged, and correspondingly increased the secondary voltage. The current intensity was reduced by 20% ~ 40%, and the current density was reduced by 1 ~ 2 A / cm2. This is also the fundamental cause of electrode under burning.