Industrial electric furnace is one of the indispensable smelting equipment in special steel production. At present, the competition in the industry is fierce. It takes about 45 minutes to tap the steel in a conventional converter. If an industrial electric furnace is used, it takes about 70 minutes. Therefore, how to further shorten the electric arc furnace smelting time, reduce the consumption, and greatly reduce the cost is a large number of special steel companies. The inherent need for development. The commonly used techniques for strengthening industrial electric furnace smelting are:

1. Industrial electric furnace hot metal mixing technology

Hot molten iron has a certain amount of physical heat, and contains high carbon, silicon, manganese and other elements with high calorific value. After oxygen blowing and oxidation, it can release a large amount of chemical heat, which makes the scrap steel quickly turn into a red hot state, which is very convenient for oxygen use. Cutting, so you can use molten iron to shorten the smelting time and improve the smelting efficiency.

Adding method: The industrial electric furnace adopts the method of mixing molten iron on the top of the furnace, that is, the first charge is about 50% of the total material weight, then the power is passed through the well for about 8 minutes, the power is cut off and the furnace cover is unscrewed, the lifting equipment will be filled with molten iron The molten iron ladle is hoisted to the top of the furnace top, and the molten iron is poured into the furnace from the top of the furnace by aiming at the electrode penetration hole for about 3 minutes, and then the furnace cover is covered and smelted by electricity.

2, RCB gun blowing technology

RCB spray gun has strong decarburization ability, which is the technical guarantee for hot metal charging. The RCB spray gun is generally installed on the furnace wall of the electric arc furnace. The oxygen jet of the spray gun oxygen lance sprays into the molten pool at supersonic speed and maintains a long cluster form. It has strong penetrating ability, fierce metallurgical reaction will occur, the decarburization speed will be accelerated, and the molten pool can be well stirred. Conducive to the uniformity of molten steel temperature and chemical composition. In order to ensure the utilization rate of RCB gun blowing oxygen, oxygen penetration ability and high decarburization rate, sufficient oxygen pressure must be ensured, but excessive decarburization reaction is violent, which will damage the refractory lining and water-cooled furnace wall. . The general control pressure is 1.2Mpa, and the decarburization rate is 0.06-0.08%C/min.

3, high-efficiency foam slag technology

The foamed slag process is the best choice for high-impedance and ultra-high-power electric arc furnaces. Good foamed slag can expand the metallurgical reaction interface and facilitate the migration of reaction products; at the same time, it can achieve good submerged arc operation with great arc thermal efficiency. improve.

The oxygen sprayed by the RCB gun reacts with the carbon in the molten pool to produce a large amount of CO gas, which can reach the conditions for the formation of foam slag in a short time. As the carbon in the molten pool is oxidized, the carbon content in the molten pool gradually decreases. It is necessary to inject carbon powder into the furnace in time to maintain the foaming of the slag. On the other hand, it can also reduce the iron oxide content in the molten slag and increase the metal The yield rate. As the reaction progresses, the alkalinity of the slag decreases and the foamed slag becomes unstable. At this time, it is necessary to add lime in batches at appropriate times during the smelting process to increase the alkalinity of the slag.