Even if each graphite electrode is the most advanced eq […]
Even if each graphite electrode is the most advanced equipment with the optimal control system, the graphite electrode manufacturer still has to operate according to the production conditions and actual conditions. Therefore, people have been working hard to optimize the production efficiency of the graphite electrode. Graphite electrode steelmaking has evolved from a low-cost smelting method that can produce only a small amount of commercial grade steel to a smelting technology capable of producing various grades and quality steels and continuously developing.
Just like every steel mill is different - adapt to specific production conditions, such as transportation conditions and dynamic conditions, each graphite electrode is also different. Operators are designed to meet specific process standards, so they use their own production methods to adapt to local or market conditions. This does not mean that graphite electrode steelmaking has no prospects. Instead, graphite electrode designers have developed a variety of graphite electrodes to perfect graphite electrode steelmaking, many of which have already been installed or operated.
The cost of charge (scrap, DRI, hot metal) may be the biggest factor in the change of graphite electrode steelmaking cost. Therefore, many graphite electrode producers, in addition to obtaining certain product quality, alternately change the charge addition mode for the best production cost. . A feed model for graphite electrode smelting stainless steel was developed, which estimated that raw materials accounted for more than 80% of the production cost. Optimize graphite electrode feed by considering the production methods, influencing factors and constraints required for each furnace, including raw materials, time, and scrap inventory. The model uses each furnace charge as a calculation factor according to the total amount of scrap steel, ferroalloy, residual steel in the furnace and furnace steel (if any), and provides different calculation modes and functions.
EAF process and BOF technology
As soon as the first furnace is filled with molten iron, the top lance immediately begins to blow oxygen to decarburize the molten steel. After the decarburization phase is completed, the oxygen lance is quickly lifted out of the furnace and the electrode is immediately placed. Continuously add DRI cold material while energizing. The second stage is carried out in the first furnace, while the second furnace is in the refining stage, so the position of the electrode is adjusted for use in the second furnace, and the first furnace is finished to refine the steel.