Thermal repair material for carbon-free refined ladle base brick and preparation method thereof

Abstract

The present invention discloses a carbon-free refined steel ladle base brick thermal-state repair material and a preparation method thereof. The repair material comprises 50-75 wt% of bauxite aggregate or corundum aggregate, 10-30 wt% of corundum fine powder, 4-10 wt% of magnesia fine powder, 4-10 wt% of spinel fine powder, 0.5-4 wt% of SiO2 micro-powder, 1-5 wt% of alpha-Al2O3 micro-powder, and 1-5 wt% of a binder. According to the production method, the repair material is adopted as a raw material, a water reducing agent accounting for 0.1-0.2 wt% of the repair material and a sintering agent accounting for 1-2 wt% of the repair material are added, the obtained mixture is placed into a stirrer, and complete and uniform stirring is performed to obtain the carbon-free refined steel ladle base brick thermal-state repair material. According to the present invention, the defects of the traditional base brick repair material are overcome; the preparation method is simple and easy to perform; the dry construction can be achieved, and the water can be added on the site to form the self-flowing material so as to construct; the construction is simple, safe and environment-friendly, and the quick base brick repair can be achieved; and the material has characteristics of low cost, excellent use performance, and flexible construction method.

Description

technical field [0001] The invention relates to a hot-state repair material for carbon-free refined ladle base bricks and a preparation method thereof. Background technique [0002] In the iron and steel metallurgy industry, the ladle was originally just a transmission device on the molten steel continuous casting operation line. In recent years, with the development of out-of-furnace refining and continuous casting technology, the use of ladles for secondary refining has become the mainstream process in major steel mills. The air-permeable bricks at the bottom of the ladle and the supporting bricks are the key components to achieve the purpose of secondary refining. [0003] After the molten steel enters the ladle, the molten steel is stirred by blowing argon gas into the molten steel through the use of breathable bricks, so as to quickly realize the homogenization of the temperature and chemical composition of the molten steel in the metallurgical process, remove the inclu...

AI Technical Summary

Problems solved by technology

[0005] Chinese patent application "Replenishment method of ladle breathable brick" (CN101985672 A) introduces the technology of repairing breathable brick under high temperature, which adds a certain amount of sintered materials such as fiber and clay on the basis of the original breathable brick material, but it does not involve Block repair

[0006] The Chinese patent "A Hot Repair Method for Ladle Ventilation Bricks" (CN101844224B) introduces a method of repairing the depressions with a repairing material in the case of depressions in the ventilation bricks. It can be used for refining ladles and non-refining ladles, but for repair There are differences in the requirements of material indicators, and it does not involve the repair of seat bricks

[0008] However, the development of ventilation brick and seat brick repair technology is still not perfect so far. There is a lot of room for research and development in both repair technology and repair materials. The main problems at present are poor sintering performance and low bonding strength of repair materials. , construction quality is difficult to guarantee, etc.