Rotating furnace smelting method with high steel scrap consumption

Abstract

The invention provides a rotating furnace smelting method with high steel scrap consumption. The rotating furnace smelting method with the high steel scrap consumption is conducted according to the following steps of (a) preparation of a heat-carrying material; (b) material preparation of the steel scrap; (c) rotating furnace smelting; (d) furnace rear operation; and (e) refining furnace operation; wherein the step (c) comprises the following material feeding process of a rotating furnace of firstly adding all waste steel material in the steel scrap and 80 percent of all iron ore, and then adding 50 percent of all the heat-carrying material from an overhead bunker, and adding the allowance of the heat-carrying material after adding molten iron, and adding a slag material and finally addingthe rest 20 percent of the iron ore at the time slot of one second to two thirds of oxygen supplying time of the middle and later periods of smelting. According to the method, the coke usage amount that the heat loss which is low in molten iron consumption and high in steel scrap ratio needs is obtained by determining the steel scrap ratio according to the components of the molten iron and then calculating the heat balance, so that the adding amount of the coke can be accurately determined and it can be realized that the coke is used in consideration of both heat loss supplement and cost consumption; the rotating furnace uses the high proportion of steel scrap, so that more industry steel scrap can be consumed and the production cost of steelmaking can be reduced.

Description

technical field [0001] The invention relates to an iron and steel smelting method, in particular to a converter smelting method with high scrap steel consumption, and belongs to the technical field of iron and steel smelting. Background technique [0002] The main role of scrap steel in the converter smelting process is as a coolant. Because scrap steel has less impurities, when scrap steel is used as a coolant, the amount of slag is less, the splash is small, and the cooling effect is stable, which is convenient for controlling the temperature in the converter molten pool. In addition, the converter uses Scrap steel can also reduce the consumption of furnace materials and reduce production costs. The cost advantage of steel scrap over hot metal is obvious. Therefore, regardless of short-term economic benefits or long-term economic and social benefits, increasing scrap ratio and reducing hot metal consumption are inevitable trends in the development of the iron and steel in...

AI Technical Summary

Problems solved by technology

To reduce the consumption of molten iron in the converter and increase the scrap ratio, the heat loss is relatively large. The converter needs to add heat-carrying materials to supplement the heat loss. To solve this problem, many steel mills currently add silicon alloy or coal powder to supplement the heat loss, but the silicon alloy High prices lead to higher production costs, and the pulverized coal injection equipment is huge and expensive, making it difficult to realize

In addition, there is still no accurate basis for the amount of heat-carrying material added. A small amount is not enough to supplement the heat, and a large amount will increase the production cost.

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