Carbon composite fireproof material for blast furnace iron runner and preparation method thereof

Abstract

The invention relates to a carbon composite fireproof material for blast furnace iron runner and a preparation method thereof. The material is made of graphite (C), Al, Si, SiC, corundum, magnesite, and vf-SiO2, wherein the weight ratio of the total weight of graphite (C), Al, Si, and SiC to the total weight of corundum, magnesite, and vf-SiO2 is 1:1. The material is prepared by the following steps: adding silica sol accounting for 10% of the total weight of raw materials, blending, forming, carrying out a hardening treatment, grinding, and finally packaging into bags so as to obtain the finished products. The casting material for blast furnace iron runner maintains the characteristics of high temperature strength, scrubbing resistance, and corrosion resistance of common fireproof material and at the same time has a certain degree of toughness like metal materials. During the melt iron discharging process, the material is subjected to cool-heat circulation, can tolerate fierce temperature fluctuation impact, can maintain a stable volume, and is not easy to peel off, so the service life of the iron runner is prolonged.

Description

technical field [0001] The invention relates to the field of castables, in particular to a carbon composite refractory material used in blast furnace iron gutters and a preparation method thereof. Background technique [0002] At present, the ironmaking blast furnace is moving towards 3000M 3 , 4000M 3 , 5000M 3 The development of large-scale scale has become an inevitable trend. A blast furnace with a daily output of 7,500-15,000 tons of iron is normalized. The iron gutter is the throat part. It is both an iron passage and a slag iron separator. The durability of the trench lining refractory material determines whether the blast furnace can be produced smoothly. [0003] Large blast furnace iron gutters generally use Al 2 o 3- SiC-C castable lining is a carbon composite refractory material, "C" comes from pitch, coke, graphite, carbon black, etc. The flake graphite is the best. [0004] Carbon flake graphite is an excellent refractory material. It has high...

AI Technical Summary

Problems solved by technology

[0004] Carbon flake graphite is an excellent refractory material. It has high temperature resistance, stable volume, good thermal conductivity and lubricity, is not infiltrated by acid-base high-temperature slag, and has good chemical stability. It is excellent as a lining material for iron gutters, but the Hydrophobic materials cannot be directly added to the product, because adding water will increase the amount of water added to the castable, resulting in increased porosity, reduced bulk density, and reduced compressive strength

Affects the use effect, and flake graphite also has defects that are easy to oxidize