Method for building steel ladle pouring working lining

Abstract

The invention relates to a method for building a steel ladle pouring working lining, which comprises 7-9 building circulations, wherein each building circulation comprises three times of gunning maintaining replenishing lining minor repairing and one time of peeling pouring medium repairing. The residual lining pervious courses of the steel ladle working lining ladle wall pouring material and ladle bottom pouring material are not removed, the building mode of gunning maintainment replenishing lining is adopted for the three times of minor repairing; when the residue thickness of the steel ladle working lining ladle wall pouring material is about 90 mm, the residual lining deformation courses of the steel ladle working lining ladle wall pouring material and ladle bottom pouring material are performed with one time of peeling pouring medium reqairing; the circulated building is performed, and synchronous pouring is performed for 7-9 times for the working lining ladle wall pouring material and ladle bottom pouring material. The service life of the steel ladle working lining after three-time minor repairing reaches 190 times, and refractory energy consumption per ton steel for the working lining can be lowered by above 0.60 kg / t compared with the common pouring technology.

Description

Technical field [0001] The invention relates to a repairing method for ladle casting working lining, belonging to the technical field of LF and RH refined ladle working lining repairing in iron and steel metallurgy. Background technique [0002] In recent years, with the development of RH refining technology and the development and production of ultra-low carbon steel, new requirements have been put forward for ladle working linings. The working linings require low carbon content, corrosion resistance, erosion resistance, and high service life. The development of refractory materials for ladle working lining has developed from carbon-free → high-carbon → low-carbon. The work lining slag line adopts magnesia carbon bricks, and the wall and bottom of the ladle are made of corundum-spinel castable. It is a low-carbon ladle working lining widely used at home and abroad. However, the main problems in the production practice of the currently adopted working lining peeling sleeve casti...

AI Technical Summary

Problems solved by technology

However, the main problems in the production practice of the currently used repairing method of working lining peeling and pouring are: (1) when the working lining is peeled and poured, the residual thickness of the cladding castable is generally 100-120mm, and the castable needs to be stripped The infiltrated metamorphic layer is 20-40mm, which is not fully utilized, which increases the consumption of working lining castables; (2) the working lining adopts the repairing working lining of peeling and pouring, which can only be repaired once, and the service life is low, generally 70-80 furnaces (2 times after one minor repair); (3) Due to the heavy local erosion of the working lining, it was forced to adopt the repair method of all peeling and pouring, which increased the consumption of working lining refractories under abnormal conditions

Images