Joint filler for converter tuyere brick replacing

Abstract

The invention relates the fireproof material, especially the joint filling material used to change revolving furnace tuyere brick. The material comprises 60-80% good magnesia, 20-40% anchoring agent and 0.2-6% addition agent. The invention has good self liquidity. The material is heated, and flows into the gap between tuyere brick and furnace bottom. The material has good intensity, oxidation resistance, and durability.

Description

(1) Technical field [0001] The invention relates to a refractory material, in particular to a joint filler used in the replacement of reblowing gas supply bricks in a steelmaking converter. (2) Background technology [0002] In order to improve the service life of the converter and the utilization rate of the equipment, it is generally required to replace the tuyere bricks within one converter operation. There will be gaps between the tuyere bricks and the bottom of the converter, and hot self-flowing fillers must be used, otherwise steel breakout accidents will easily occur at the gap between the furnace bottom and the tuyere bricks. [0003] The existing converter repair materials are magnesia and magnesia-carbon repair materials, most of which are bonded with asphalt and also bonded with resin. Such as Japanese Patent Laid-Open 5-209213 introduces the repair material used in the tuyere area, which is magnesia 100, and liquid thermosetting phenolic resin 8-20%. The mater...

AI Technical Summary

Problems solved by technology

The material has good self-flowing properties at normal temperature, but the following problems occur: 1) The temperature in the furnace is often above 600°C, and it will be cured before it can be leveled when it is hot repaired

Therefore, the repair material cannot be leveled in a hot state; 2) The storage period of the thermosetting phenolic resin binder is very short, especially after mixing with magnesia, it should be used up quickly, otherwise it will be cured and invalid; 3) The repair material that cures in a short time , the air permeability of thermosetting resin is very poor, it is very easy to burst and peel off

[0004] Traditional converter hot repair materials are mainly made of asphalt magnesia, which is characterized by low price, but black smoke and poor durability when used

It cannot be used to fill the gap between the replacement tuyere brick and the bottom of the converter