Composite mortar for building blast furnace stack graphite brick and carborundum brick

Abstract

This invention discloses a composite daub of graphite bricks and SiC bricks for building stacks of furnaces, in which, the daub is composed of SiC, graphite, binder, antioxidation agent and a solidifying agent mixed in proportion, since SiC has high intensity under high temperature, the graphite material has high heat conduction performance and the binder strengthens the adhesive performance and anti-high temperature performance of the daub, the solidifying agent strengthens the plastic and self-modification function of the composite daub under high temperature, the invented daub has the property of high heat-conduction coefficient and hot state high intensity under 800-1400deg.C and can be used in building composite kiln lining composed of graphite bricks and SiC bricks.

Description

technical field [0001] The present invention relates to an unshaped refractory material for blast furnace lining, and more specifically refers to a composite mastic for building graphite bricks and silicon carbide bricks in blast furnace body. The masonry at the junction of graphite bricks and silicon carbide bricks in the composite furnace lining composed of silica bricks. Background technique [0002] The blast furnace is an indispensable large-scale smelting equipment in the metallurgical industry. The lining refractories of the blast furnace body traditionally used for ironmaking mostly use a single aluminum silicate series or silicon carbide brick. People in the industry know that aluminum silicate series and silicon carbide bricks Although the strength is high, the thermal conductivity of the two is poor, especially the thermal conductivity of aluminum silicate bricks is lower, about 2W / m K. This kind of lining brick is used as the working surface of the blast furnace,...

AI Technical Summary

Problems solved by technology

Experiments have shown that when these two kinds of cement are used to build silicon carbide bricks and graphite bricks to form composite furnace linings, they have no strength under high temperature conditions (800°C-1400°C), and even the furnace linings fall off and separate, making them unusable.

[0005] So far, there is no compound cement that can firmly bond two different materials of silicon carbide bricks and graphite bricks into a whole under high temperature conditions, and the compound cement must also meet the requirements of the blast furnace lining in the actual use environment of 800 It should also have high thermal conductivity at -1400°C, can be solidified at room temperature to produce a certain strength, and has high thermal strength, so as to meet the needs of building a blast furnace body with a composite furnace lining composed of silicon carbide bricks and graphite bricks.

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