Molten iron slag removing method

Abstract

The invention provides a molten iron slag removing method. The method comprises the following steps of: controlling the distance between the slag surface of molten iron and the jar edge of a molten iron jar to be greater than 300 mm; inclining the molten iron jar in an angle of 5 DEG to 9.5 DEG by utilizing an iron hook, and enabling the distance between the upper end of the slag surface and the jar edge of the molten iron jar to be 50 to 100 mm; removing slags from the surface of the molten iron in the molten iron jar by utilizing a slag remover after the molten iron is desulfured; adding slag accumulating agents to the molten iron according to the proportion of adding 0.3 to 0.5 kg of the slag accumulating agent to every ton of the molten iron; and after slag removing, adding heat preserving agents according to the proportion of adding 0.3 to 1.2 kg of the heat preserving agent to every ton of the molten iron. According to the invention, the slag removing time is shortened greatly, i.e. the slag removing time is shortened from 10 minutes to 8 minutes; and the slags in the molten iron jar are removed to a maximum extent, i.e. the slag removing rate is improved from 71% to 83%, so that the slag removing loss of the molten iron is lowered by 13.2%. Therefore, the internal quality and the surface quality of steel material are improved, and the smelting cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of steelmaking technology, and in particular relates to a fast and efficient method for removing slag from molten iron. Background technique [0002] At present, domestic and foreign molten iron pretreatment slag removal equipment all adopt mechanical transmission or hydraulic pressure driven reciprocating molten iron slag removal equipment. The equipment dips into the molten iron surface to a certain depth through the steel rectangular slag removal plate installed on the cantilever, and performs linear or curved reciprocating motion along the molten iron surface to remove the pretreatment slag or molten iron slag on the molten iron surface in the molten iron tank one by one. pick out. But the problem is: [0003] 1. Due to the shape difference between the rectangular slag removal plate and the circular section of the molten iron tank, it is difficult to remove the scum from the edge of the molten iron tan...

AI Technical Summary

Problems solved by technology

[0003] 1. Due to the shape difference between the rectangular slag removal plate and the circular section of the molten iron tank, it is difficult to remove the scum from the edge of the molten iron tank, resulting in long time-consuming and low efficiency

[0004] 2. Due to the good fluidity of the slag, the slag flows back from both sides of the slag removal plate during the slag removal process, resulting in incomplete slag removal and low slag removal rate. After adding the slag accumulator, the highest slag removal efficiency can only reach 80% %, the result is that it is very easy to increase the cost of desulfurization in the subsequent treatment process

[0005] 3. Due to the long-term reciprocating slag removal, the iron loss of slag removal is large, and the iron loss is generally about 0.5%.