Refractory and heat-insulation material for blast furnace air supply system and preparation method of refractory and heat-insulation material

Abstract

The invention relates to a refractory and heat-insulation material for a blast furnace air supply system and a preparation method of the refractory and heat-insulation material. The refractory and heat-insulation material is prepared from the following raw materials: AL2O3, SIO2, floating beads, alumina hollow balls, white mud, silica powder, sodium tripolyphosphate, alpha-alumina micro powder, andalusite, sillimanite, kyanite and potassium feldspar. According to the refractory and heat-insulation material for the blast furnace air supply system and the preparation method of the refractory and heat-insulation material, provided by the invention, andalusite, sillimanite, kyanite and potassium feldspar are added to the refractory and heat-insulation material according to a certain proportion, therefore the linear change rate of the refractory and heat-insulation material is increased to be a positive value, slight volume expansion of the refractory and heat-insulation material under the working temperature of 1250-1350 DEG C can be realized, the disadvantage of cracking of the refractory and heat-insulation material caused by volume shrinkage under the condition of a high temperature can be basically eliminated, the fire-resistant and heat-insulation effect is obvious, the service life of throat parts can be improved by nearly one time, and the field downtime ratio is reduced by nearly 35%.

Description

technical field [0001] The invention relates to a refractory material and a preparation method thereof, in particular to a refractory and heat insulating material used in a blast furnace air supply system and a preparation method thereof. Background technique [0002] In blast furnace ironmaking equipment in the metallurgical industry, refractory and heat insulating materials are generally used in related components with a working temperature above 600 °C. The air supply system of the ironmaking blast furnace is installed around the blast furnace, which sends the hot air heated by the hot blast furnace at 1250-1350°C into the blast furnace. The fire-resistant and heat-insulating material layer inside the part works for a long time under the harsh conditions of high temperature, high pressure and high flow rate, and is limited by its own structure. There are problems such as poor heat insulation performance, easy cracks, and falling off. These problems lead to defects such a...

AI Technical Summary

Problems solved by technology

The air supply system of the ironmaking blast furnace is installed around the blast furnace, which sends the hot air heated by the hot blast furnace at 1250-1350°C into the blast furnace. The fire-resistant and heat-insulating material layer inside the part works for a long time under the harsh conditions of high temperature, high pressure and high flow rate, and is limited by its own structure. There are problems such as poor heat insulation performance, easy cracks, and falling off. These problems lead to defects such as high temperature on the outer wall of the air supply system, air leakage, and short service life. These defects have seriously restricted the continuous operation of the ironmaking blast furnace system for a long time. Shutdown rate of iron blast furnace remains high

The reason lies in the characteristics of ordinary refractory insulation materials --- the linear change rate of refractory insulation materials is negative, and the volume shrinks when working at a high temperature of 1250-1350 ° C. Cracks are prone to occur, and once cracks occur, they will continue to develop, eventually causing damage and shedding of the refractory insulation material