Hydration-resistant hot-state mending material for steelmaking converter and preparation method thereof

Abstract

The invention particularly relates to a hydration-resistant hot-state mending material for a steelmaking converter and a preparation method thereof. The technical scheme of the preparation method is that 40 to 70wt% of sintered magnesia particles or fused magnesia particles, 5 to 20wt% of flake graphite and 15 to 40wt% of forsterite fine powder are taken as raw materials, elementary silicon powder occupying 1 to 10wt% of the raw materials and liquid phenolic resin occupying15 to 30wt% of the raw materials are added to the raw materials and stirred with the raw materials for 5 to 30 minutes, and then the hot-state mending material for the hydration-resistant steelmaking converter is manufactured; and the hot-state mending material is mud-shaped. When in use, the mending material is poured into the converter, and the converter is shaken to enable the mending material to flow to positions of a material loading part, a part discharging part, a large surface part and a converter bottom, which need to be mended in a hot state, and be sintered by relying on heat in the converter. The hot-state mending material has the characteristics of rich raw material, environmental friendliness, short sintering time, good hydration-resistant performance, high high-temperature strength, erosion resistance and long service life.

Description

technical field [0001] The invention belongs to the technical field of repairing materials, and in particular relates to a hot-state repairing material for a hydration-resistant steelmaking converter and a preparation method thereof. Background technique [0002] In the past two decades, carbon-containing refractory materials have been widely used in high-performance refractory materials due to their excellent performance, especially in the steelmaking converter lining materials in the iron and steel metallurgical process, making the converter lining materials The life span is greatly improved. In the process of using carbon-containing refractories as converter lining materials, it is necessary to carry out hot on-line repairs on the parts of the furnace lining materials that are severely eroded locally, so as to maintain the service life of the entire converter lining materials. [0003] At present, the hot on-line repair materials used in steelmaking converters at home an...

AI Technical Summary

Problems solved by technology

Asphalt-bonded repair materials are characterized by long sintering time, low density, poor strength and short service life during use; at the same time, during the repair process, a large amount of black smoke due to the solidification of asphalt also affects the health of operators and pollutes the environment

Inorganic salt combined with magnesium repair material, although the sintering time is short and does not emit black smoke, but the high temperature strength of this type of repair material is low, it is not resistant to steel slag erosion, and the service life is not long

In addition, there are sintered or fused magnesia fine powders in the hot repair materials for various types of converter linings. Long-term transportation and storage at the converter site will be affected by the fine powder of magnesia in the repair materials due to MgO+H 2 O=Mg(OH) 2 It will lead to hydration and reduce the performance and life of the repair material. In severe cases, it will cause the slag and residual molten steel inside the converter to splash and cause equipment failure or human safety.

[0004] In short, the existing hot repair materials for steelmaking converters have the problems of low service life and easy hydration, or the problems of black smoke and short sintering time during hot on-line repair