Smelting method capable of reducing steel and iron material consumption of electric furnace steelmaking

Abstract

The invention discloses a smelting method capable of reducing steel and iron material consumption of electric furnace steelmaking. The smelting method comprises the following specific steps: in the furnace burden construction, controlling the ratio of scrap steel to be 15% to 27%, and the ratio of molten iron to be 73% to 85%; transporting the scrap steel by a travelling crane, and adding the scrap steel into a furnace from the top of the furnace once; after the scrap steel is added completely, adding 5kg / t lime into the furnace through an overhead bunker; adding the molten iron into the furnace twice, wherein the molten iron added for the first time accounts for 75% or above of the total amount of the molten iron and is added at the rate of 20-30t / min, and the molten iron added for the second time accounts for 25% or lower of the total amount of the molten iron and is added at the rate of 2-5t / min; and after the first package of molten iron is added completely, starting oxygen blowingoperation, and at the same time, adding the lime into the furnace for slagging, wherein the slag basicity during the entire smelting process is 2.5 + / - 0.5. The smelting method can solve the problemsof splashing in the smelting process and high total iron content of slag under the condition of hot-charging molten iron ratio of 73%-85%, thereby achieving the purpose of reducing the consumption ofsteel and iron materials.

Description

technical field

[0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a smelting method for reducing consumption of steel materials in electric furnace steelmaking. Background technique

[0002] As the main raw material for electric furnace smelting, molten iron can provide carbon source, heat and reduce the content of residual elements, which can greatly reduce the power consumption in the smelting process, realize the reduction of smelting cost and the improvement of billet quality. However, when the electric furnace is smelted with a high molten iron ratio, the molten pool reacts violently, and the molten steel is easy to overflow the furnace door; in addition, the content of iron oxide in the slag is high, the iron loss of slag flow is large, and the consumption of steel materials is high. When the existing electric furnace adopts high iron-water ratio to organize production, the smelting process adopts the operation mode of...