When is it appropriate to add limestone in converter steelmaking?

Answer:

Open the money to join the 1/3 to 1/2 the amount of lime, and then blow 4 minutes or so to join 1/3 or so, at this time can be added to the part of limestone, according to the small amount of furnace temperature in the middle and late to join. It is best to join with lime to reduce the amount of dolomite.

General smelting has just begun to add 1/3 to the amount of lime 1/2, and then about 4 minutes or so to join the amount of 1/3, which should be at least the amount of the total amount of two 3/4, and then leave a small part in the latter part of the situation to join.

The amount of 1/2~2/3 in the smelting period, favorable conditions for the effective use of the low temperature can go to phosphorus slag; good conditions in the converting process, small batch addition can effectively use lime, adding a certain amount of lime blowing to ensure the alkalinity, to make up for the heating lead back to phosphorus.