Thermal-state mending material taking forsterite as raw material for converters and preparation method thereof

Abstract

The invention relates to a thermal-state mending material taking forsterite as a raw material for converters and a preparation method thereof. The technical scheme is as follows: adopting 45-70wt% of sintered magnesia particles, 5-15wt% of graphite and 15-40wt% of forsterite fine powder as raw materials; adding simple substance silicon powder accounting for 1-10wt% of the weight of the raw materials and liquid pitch modified phenolic resin accounting for 15-25wt% of the weight of the raw materials; and stirring for 5 to 30 minutes to obtain the slurry thermal-state mending material taking forsterite as the raw material for converters. While being used, the thermal-state mending material is poured into the converter, the converter is rotated to enable the mending material to flow to the charging position, the tapping position, the bedding face and the furnace bottom of the steelmaking converter which are in need of thermal-state mending and the mending material is sintered by the heat in the converter. The material has the characteristics of abundant raw materials, low production cost, excellent hydration-proof performance, easiness in sintering at a high temperature and convenience in combination with the converter lining and is beneficial for prolonging the service life of materials of the converter lining.

Description

technical field [0001] The invention belongs to the technical field of repairing materials, and in particular relates to a hot repairing material for a converter using forsterite as a raw material 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 refractory materials 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 to ensure the service life of the entire converter lining materials. [0003] At present, the hot on-line repair materials used in steelmaking converters in domestic an...

AI Technical Summary

Problems solved by technology

Asphalt-bonded repair materials are characterized by long sintering time, low compactness, poor strength and short service life during use; at the same time, during the repair process, a large amount of black smoke is emitted due to the solidification of asphalt, which 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 on-line repair materials for converter lining have the problems of high cost, black smoke and long sintering time during hot on-line repair of the repair materials, or the problems of easy hydration and low service life during use.