Refractory furnace lining material and ramming method thereof

Abstract

The invention relates to the field of furnace lining materials, and particularly discloses a refractory furnace lining material and a ramming method thereof. The refractory furnace lining material isprepared by mixing the following raw materials in parts by weight: 76-85 parts of high-alumina bauxite, 15-20 parts of quartz sand and 5-10 parts of an adhesive, wherein the adhesive is an ethylene-propylene copolymer. The method comprises the following steps: ramming of a furnace lining: subjecting the refractory furnace lining material to filling and ramming layer by layer, wherein the thicknessof each filling layer is not more than 100 mm; and baking: conducting baking in an empty furnace, baking scrap steel and sintering molten steel so as to obtain the refractory furnace lining, whereinthe temperature of baking in the empty furnace is 100-500 DEG C, the temperature of baking the scrap steel is 500-1100 DEG C, and the temperature of sintering the molten steel is 1620-1780 DEG C. Therefractory furnace lining material has the advantages of high refractoriness and long service life.

Description

technical field [0001] The application relates to the field of furnace lining materials, more specifically, it relates to a refractory furnace lining material and a ramming method thereof. Background technique [0002] The intermediate frequency electric furnace is widely used due to its strong heating capacity, intermittent production, flexible and convenient use, and is developing in the direction of high power and large furnace type. The working lining thickness of intermediate frequency electric furnace is thin, the temperature gradient of the working layer of the lining is large, and it needs to withstand the liquid metal scour caused by electromagnetic stirring and repeated rapid cooling and rapid heating. Therefore, the furnace lining refractory material must have a sufficiently high refractoriness and load softening temperature relative to liquid metal, good thermal stability, no chemical reaction with liquid metal, high temperature mechanical strength and wear resis...

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Problems solved by technology

[0004] When quartz is in use, due to its large thermal expansion coefficient and poor thermal shock resistance, the service life of the furnace lining is not long, and the service life of the furnace is generally only 10-20 furnaces.

Alkaline lining materials will chemically react with the slag layer, resulting in low life of lining materials

Therefore, in recent years, neutral lining refractory materials are the most widely used, but neutral refractory materials mostly use alumina and high-alumina materials as raw materials, and use additives as sintering agents, but the actual refractoriness often does not reach above 1700°C and wear performance Poor, resulting in a short life of the furnace lining, generally around 50 furnaces

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