Blowing slag-removing equipment for molten iron pretreatment

Abstract

The invention relates to blowing slag-removing equipment for molten iron pretreatment, which is arranged on a platform of a slag-raking machine of a molten iron tank. The blowing slag-removing equipment comprises a guide rail, a rotary bearing, an adjustable bearing, a guide roll, a guide chain wheel, an elevating drive unit, an elevating trolley, a blowing rod and a refractory material section, wherein, the guide rail is arranged slantwise above the molten iron tank; the elevating trolley is arranged on the guide rail; the elevating drive unit drives the elevating trolley to move up and down along the guide rail through the guide chain wheel; the rotary bearing is connected with the upper part of the guide rail, the adjustable bearing is connected with the middle part of the guide rail, and the guide roll is arranged at the lower part of the guide rail; the rotary bearing and the adjustable bearing are fixed on the platform of the slag-raking machine; and the blowing rod is arranged on the elevating trolley and the refractory material section is connected with the lower part of the blowing rod. When the slag-raking machine runs, the blowing rod is inserted in ladle for blowing nitrogen; and during the slag-removing process, the slag quantity is continuously reduced and an exposed surface of molten iron is increasingly enlarged until the slag is almost entirely removed. The blowing slag-removing equipment can shorten the slag-removing time by 2 minutes, lower the iron loss by over 20% and achieve better economic benefit.

Description

technical field [0001] The invention relates to molten iron pretreatment, in particular to an air blowing slag removal device during the molten iron pretreatment. Background technique [0002] At present, most of the hot metal pretreatment in domestic and foreign steelworks adopts the process of desulphurization and dephosphorization after blowing or stirring method and then removing slag. The injection or stirring process determines the level of sulfur and phosphorus in the molten iron at the end of the treatment. The slag removal process is an important means to remove the slag after desulfurization and phosphorus treatment from the molten iron, and is the main factor determining the total amount of sulfur and phosphorus in the furnace. Therefore, it is very necessary to adopt advanced slag removal equipment and technology to control sulfur and reduce production costs in the steelmaking system. In order to improve the slag removal effect, some domestic steel mills adopt t...

AI Technical Summary

Problems solved by technology

In order to improve the slag removal effect, some domestic steel mills adopt the bottom (side) blowing auxiliary slag removal process of the molten iron tank, but there are many problems in the development process, such as serious erosion of the side wall of the molten iron tank, shortened life of the venting brick and the molten iron tank, and iron leakage Accidents and the inconvenience of maintenance and replacement

There are also steel mills that add a slag blowing device to the slag remover body, but the effect of slag removal is not ideal due to insufficient depth of insertion of molten iron, severe environmental heat radiation, etc.

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