Method for reducing solvent consumption under slag remaining condition of converter

Abstract

The invention discloses a method for reducing solvent consumption under a slag remaining condition of a converter. The method comprises the following steps of (1) preparing two bins in a converter region before converter operation, wherein one of the bins is used as a raw dolomite bin, and the other bin is used as a limestone bin; (2) confirming the addition amount of the converter according to steel type and molten iron conditions, wherein the addition amount of raw dolomite in every ton of aluminum killed steel is less than or equal to 12kg, the addition amount of limestone in every ton of aluminum killed steel is less than or equal to 10kg, the addition amount of the raw dolomite in every ton of other kinds of silicon killed steel is less than or equal to 10kg, and the addition amount of the limestone in every ton of other kinds of silicon killed steel is less than or equal to 8kg; (3) adding the limestone along with the first batch of active lime at one step before beginning to blow in the smelting process; and adding the raw dolomite at one step when beginning to blow to the deslagging period; (4) sampling no slag specimen in first converter slag remaining operation during converter pouring for sampling once the blowing oxygen of the converter is up to 750S; and (5) keeping the tapping temperature at 1660-1700 DEG C during tapping. By using the method, the waste steel consumption of the converter can be effectively reduced, so that the cost of a converter solvent is reduced.

Description

Technical field [0001] The invention belongs to the technical field of converter steelmaking, and specifically refers to a method for reducing solvent consumption under the condition of slag retention in the converter. Background technique [0002] In order to further reduce costs in steel production, lower cost limestone and raw dolomite can be used to replace active lime and light-burned dolomite respectively. As limestone and raw dolomite, they are characterized by a carbonate structure. Decomposition occurs, and calcium oxide and magnesium oxide are formed after decomposition to form the basis of slag. [0003] The slag retention method of the converter is to add a certain amount of flux during the slag splashing of the previous furnace, and add scrap and iron normally after splashing dry, and finally add the flux according to the 20% reduction of the flux of the furnace without slag. When it reaches 30%, when converter slag is generated, pour the slag once. Slightly careless...

AI Technical Summary

Problems solved by technology

Slightly careless slag operation can easily cause large splashing accidents

However, when the raw dolomite is completely used under the condition of leaving slag, a large amount of heat will be released during decomposition, and the process is relatively intense. If the timing is not grasped properly, the metal material in the converter will be splashed and a large amount of loss will be caused, and the converter will explode in severe cases. cause a major accident

At the same time, when raw dolomite decomposes, it will absorb a large amount of heat, and the cooling effect is far superior to that of ordinary coolants. When the addition of raw dolomite to the converter is not good, it is easy to cause the temperature of the converter to be too low, resulting in quality accidents.