Acid lining material of medium-frequency induction furnace and furnace building method thereof

Abstract

The invention relates to an acid lining material of a medium-frequency induction furnace and a furnace building method thereof. Components of a furnace body lining material comprise that proportion of quartz sand and boric acid is 100: 0.8-1.3 by mass percentage. The quartz sand comprises 5% to 11% of quartz sand with granularity of 3-5 meshes, 18% to 22% of quartz sand with granularity larger than 5-10 meshes, 20% to 30% of quartz sand with granularity larger than 10-20 meshes, 10% to 20% of quartz sand with granularity larger than 20-40 meshes, 5% to 11% of quartz sand with granularity larger than 40-70 meshes and 25% to 30% of quartz sand with granularity of 270 meshes by weight. Materials of a furnace collar and a furnace nozzle comprise 5% to 20% of quartz sand with granularity of 6-10 meshes, 30% to 50% of quartz sand with granularity larger than 10-20 meshes, 30% to 50% of fire clay and 4% to 7% of water glass. The acid lining material and the furnace building method can prolong effective service life of an acid lining and shorten furnace baking time by improving the lining material and the furnace building process.

Description

technical field [0001] The invention relates to an acid lining material for an intermediate frequency induction furnace and a furnace building method thereof, belonging to the technical field of intermediate frequency induction furnaces. Background technique [0002] Induction furnaces are divided into power frequency induction furnaces and intermediate frequency induction furnaces. From the comprehensive consideration of economy and efficiency, intermediate frequency induction furnaces have been developed rapidly, especially in the application of cast iron, cast steel and non-ferrous alloy smelting. The requirements of the melting process for the induction furnace lining are refractoriness, physical and chemical stability, small thermal expansion coefficient, high high temperature strength, good insulation performance, low thermal conductivity, raw material cost and environmental protection. However, in actual production, due to high temperature, intense cooling and heat, s...

AI Technical Summary

Problems solved by technology

The boric acid accounts for more than 2% of the quartz sand in the above-mentioned lining materials, and a large amount of boric acid will cause the melting temperature of the quartz sand to thicken and sinter the sintered layer, which will reduce the thickness of the lining buffer layer and reduce the service life due to the decrease in the strength of the lining.

Secondly, the coarse sand in the proportion of quartz sand particle size in the existing acidic lining materials is relatively simple, and the quartz sand particle size and its proportion make the lining difficult to form compact, which affects the service life. Therefore, the effective service life of the acidic lining is currently on average in About 200 furnaces

Furthermore, the current oven time is about 12 hours, which wastes a lot of raw materials and electricity, and also increases the cost of furnace construction.

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