Press-in material for blast furnace hearth

Abstract

The invention relates to the field of refractory materials for an iron-making blast furnace, in particular to a press-in material as filler for gaps of a blast furnace hearth. The press-in material comprises anthracene oil, SiC powder, graphite powder and an auxiliary binder. A preparation method of the press-in material comprises the following steps: the anthracene oil is added to a mixed material of the SiC powder and the graphite powder, the weight ratio of the anthracene oil to the mixed material is 3:1, and the mixture is heated and distilled; after distillation, samples are taken for component test, and the samples are taken out and cooled after the test result is qualified. The press-in material has good flowing property, the heat conduction coefficient is close to that of a carbon brick material, the press-in material can solidify quickly at a high temperature to block the gaps, so that gas leakage of the blast furnace hearth can be avoided, the thermal conductivity of the blast furnace hearth can be enhanced, and the press-in material has higher practical value.

Description

technical field [0001] The invention relates to the field of refractory materials for ironmaking blast furnaces, in particular to a filling material for cracks in hearths of ironmaking blast furnaces. Background technique [0002] The blast furnace is a large-scale smelting equipment with strong continuity. The normal design of the first-generation furnace has been in service for more than 15 years. void. Moreover, during the normal production process of the blast furnace, due to a series of physical and chemical effects in the furnace, the hearth carbon bricks are eroded to form gaps, forming gas passages. The high-temperature gas escapes through the gap, on the one hand, the gap between the hearth brickwork and the stave and the furnace shell is continuously enlarged, and on the other hand, the filling material between the carbon brick and the stave, and between the stave and the furnace shell is destroyed. As a result, the temperature of the hearth side wall and furnace...

AI Technical Summary

Problems solved by technology

However, the following principles need to be considered in the process of sealing the gaps. First, there are many gaps and they are quite small, and ordinary materials cannot be filled in. Second, in order to achieve the purpose of heat conduction, the thermal conductivity of the material must be equivalent to that of hearth masonry refractory materials. Third, First, the material must solidify quickly at high temperature to achieve the purpose of sealing. Fourth, the material must not contain flammable and explosive substances

Many press-in materials that exist today have various defects and cannot meet the above requirements at the same time