Fast repairing material in use for flush type desulfurized for molten iron

Abstract

A material for fast repairing the submersible desulfurizing tool of molten iron is proportionally prepared from 6 raw materials including super-grade high-Al powder, refractory clay, adhesive, disperser, anti-exploding agent, etc. Its advantages are high heat shock stability, adhesion and resistance to stripping and flush.

Description

technical field [0001] The invention relates to a refractory material for molten iron desulfurization pretreatment submerged hot metal desulfurization equipment, in particular to a quick repair material for a spray gun or agitator used for molten iron injection or stirring desulfurization. Background technique [0002] In order to meet the market's requirements for the quality of iron and steel products, continuously reduce the production cost of iron and steel products, and improve the market competitiveness of iron and steel enterprises, many iron and steel enterprises at home and abroad have carried out desulfurization pretreatment on the molten iron in the steelmaking furnace to optimize the smelting process and reduce production costs. , Even for the production of ordinary carbon steel, the sulfur content of molten iron entering the furnace is required to be less than 0.020%, so as to improve the final quality of steel products. It can be seen that hot metal desulfuriza...

AI Technical Summary

Problems solved by technology

However, these two desulfurization processes require the use of submerged molten iron desulfurization equipment. Due to the violent erosion of molten iron and frequent rapid cooling and rapid heating, the refractory lining of the equipment is eroded and peeled off, which seriously restricts the service life of the desulfurization equipment. The technical and economic indicators of desulfurization, in order to effectively extend the service life of desulfurization equipment, many domestic manufacturers have successively used refractory plastics to repair, such as the Chinese Invention Patent Publication No. CN1161301C discloses a refractory mixture that can be submerged into molten iron to repair the gun lining. The main components are mullite corundum clinker, containing Al 2 o 3 Not less than 70% of high alumina cement, refractory clay, at the same time, add chemical bonding agent as auxiliary bonding agent to improve the repair bonding strength of refractory mixture

However, due to the high temperature shrinkage of the plastic repair material, the repair layer shrinks and cracks and peels off; the hydration reaction of the cement binder under high temperature repair conditions is insufficient, resulting in low bond strength of the repair layer; poor thermal shock stability, resulting in thermal spalling of the repair layer; Expensive and so on