Making method of main channel castable of blast furnace

Abstract

The invention discloses a making method of a main channel castable of a blast furnace. The making method comprises the following steps: firstly, mixing a corundum aggregate and heated powdery asphalt according to a mass ratio of 1:4 to prepare an asphalt covered corundum aggregate; and secondly, mixing the asphalt covered corundum aggregate with corundum powder, metal aluminum powder and anti-explosion fibers together, wherein all components in parts by mass are as follows: 50-60 parts of asphalt covered corundum aggregate, 20-30 parts of corundum powder, 0.02-3 parts of metal aluminum powder, 0.0003-0.05 part of anti-explosion fibers and 1-3 parts of sodium tripolyphosphate. The making method has the beneficial effects that because the asphalt covering the corundum aggregate is heated to be carbonized and shrunk, microcracks are formed around the corundum aggregate, an action of partial heat stress is counteracted so that the situation that an internal structure of the main channel castable is damaged due to expansion caused by heat and contraction caused by cold can be avoided, carbon residue obtained after the asphalt is carbonized is uniformly dispersed in the castable to play a role in resisting slag, thus the slag resisting performance of the castable is integrally improved, the antistrip performance of the castable is enhanced, and the once iron passing amount is increased.

Description

【Technical field】 [0001] The invention relates to the field of refractory material manufacturing, in particular to a method for manufacturing blast furnace main ditch castables. 【Background technique】 [0002] my country is a big steel producing country in the world and consumes a lot of refractory materials. The general requirements for refractory materials for domestic large and medium-sized blast furnace tapping channels are: high temperature resistance, corrosion resistance, erosion resistance, penetration resistance, and high thermal conductivity. Because SiC materials are not easily infiltrated by slag and have high thermal conductivity, they are often used to improve the resistance of castables to blast furnace slag erosion and spalling. The refractory materials for large and medium-sized blast furnace tapping channels are mainly Al 2 o 3 - SiC castables are generally composed of refractory aggregates, powders, binders, admixtures, water or other liquid materials, a...

AI Technical Summary

Problems solved by technology

Because SiC materials are not easily wetted by slag and have high thermal conductivity, they are often used to improve the resistance of castables to blast furnace slag erosion and spalling. The refractory materials for large and medium-sized blast furnace tapping channels are mainly Al 2 o 3 -SiC castables are generally composed of refractory aggregates, powders, binders, admixtures, water or other liquid materials. They can be formed by vibratory casting, self-flowing casting, etc. at the site of use, and can also be made into prefabricated parts. At present, in the castables commonly used in China, the content of SiC is about 15% to 25%. However, in recent years, with the popularization of blast furnace intensified smelting, the problem of the decline in the spalling resistance of iron trench castables due to SiC oxidation is more prominent.

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