Crack grouting material for blast furnace body and preparation method thereof

Abstract

The invention relates to a crack grouting material for a blast furnace body and a preparation method thereof, which belong to the field of fire-proof materials, and particularly relates to a fire-proof material for grouting and repairing the cracks of the blast furnace body. The grouting material mainly comprises two parts, namely a major material and a bonding agent, wherein the major material comprises the following raw materials in percentage by mass: 65 to 68 percent of silicon carbide (SiC), 25 to 28 percent of quartz, 4 to 7 percent of aluminum oxide (Al2O3) and about 1 percent of graphite; the grain diameter of the SiC is less than 1,000 mu m; the grain diameter of the quartz is less than 300 mu m; the grain diameter of the Al2O3 is less than 120 mu m; the grain diameter of the graphite is less than 120 mu m; the bonding agent is added in an amount which is 50 to 55 percent based on the mass of the major material; polyethylene glycol accounts for 43.5 to 46.5 percent of the bonding agent; and polyvinylpyrrolidone accounts for 6.5 to 8.5 percent of the bonding agent. The preparation method comprises the following steps of: weighing the raw materials of the major material respectively and dry mixing; weighing the components of the binding agent respectively and adding the binding agent; and mixing uniformly. The grouting material has high-temperature resistance, corrosionresistance, smaller thermal expansion coefficient, bigger thermal conduction coefficient and high heat stability, has fluidity at the temperature of between the room temperature and 180 DEG C, can efficiently grout the cracks of the blast furnace body, and is competent in grouting and repairing operation of various cracks of the blast furnace body and the working conditions of the blast furnace body.

Description

technical field [0001] The invention belongs to the field of refractory materials, and in particular relates to a refractory material for iron-making blast furnace furnace body grouting and repairing and a preparation method thereof. Background technique [0002] In 2009, my country's crude steel output reached 567.8 million tons, accounting for almost half of the world's total output. As the world's largest steel country, the steel industry occupies a pivotal position in my country's national economy. At present, there are more than 1,200 ironmaking blast furnaces in my country, and there are more than 200 blast furnaces with a volume greater than 1,000 cubic meters. [0003] Generally, after the hot start of a newly-built blast furnace, various materials in the furnace body will "creep" to varying degrees, resulting in local cracks in the furnace body material, which often leads to gas leakage on the face of the taphole and around the tuyere; the iron hole is often subject...

AI Technical Summary

Problems solved by technology

[0008] At present, using silicon carbide, quartz, alumina and graphite as the main raw materials, polyvinylpyrrolidone and polyethylene glycol are used as binders to prepare blast furnace body grout and its preparation method, which is still in the domestic industry. blank

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