Furnace building method of intermediate-frequency induction furnace for copper alloy smelting

Abstract

The invention relates to a furnace building method of an intermediate-frequency induction furnace for copper alloy smelting, which comprises the following steps: firstly, preparing a lining material of a furnace-body outer lining and a fire-door lute, and laying a layer of epoxy plate and placing an induction coil on an asbestos board base; laying a glass fiber fabric on the inner wall of the induction coil and the epoxy plate, so that the glass fiber fabric is formed into a pocket shape; hierarchically adding the lining material of the furnace-body outer lining into the glass fiber fabric pocket, and hierarchically tamping and knotting the obtained product so as to form a furnace bottom; then, placing a graphite crucible on the midmost position of the furnace bottom and compacting the furnace bottom; hierarchically adding the lining material of the furnace-body outer lining into a space between the glass fiber fabric bag and the graphite crucible, and tamping and knotting the lining material so as to obtain the furnace-body outer lining, so that the top surface of the furnace-body outer lining is lower than the top surface of the graphite crucible and the top surface of the induction coil; adhering a fire door to the top surface of the graphite crucible through the fire-door lute, filling the fire-door lute between the fire door and the glass fiber fabric bag, and carrying out tamping and flattened-brushing on the fire-door lute so as to obtain a fire-door outer lining; carrying out sintering on the outer lining by using an oven, so that silica has crystal transformation; and after the whole furnace is hardened, stopping heating so as to complete the furnace building. The method disclosed by the invention has the characteristics of high strength, good furnace-body combined performances and long service life.

Description

technical field [0001] The invention relates to a method for building an intermediate frequency induction furnace for smelting copper alloys, belonging to the technical field of smelting equipment. Background technique [0002] At present, medium-frequency induction furnaces are mostly used for melting copper alloys in small and medium batches. The lining of intermediate frequency induction furnaces for smelting copper alloys can be divided into two types. One is to use quartz sand and binder or magnesia and binder to mix and knot. It is also commonly called acidic and alkaline lining. In the end, several furnaces of steel or iron need to be melted to make the furnace lining sintered firmly, and then the furnace should be washed in some way to avoid pollution caused by impurity elements when the copper alloy is melted in the later stage. There are many impurities in the process. The other is to use graphite crucible as the lining of the furnace body. The furnace body linin...

AI Technical Summary

Problems solved by technology

The proportion of boric acid in the above-mentioned furnace outer lining material to the quartz sand exceeds 2%, and a large amount of boric acid will cause the formation of a thickened sintered layer at the melting temperature of the quartz sand, which will reduce the thickness of the furnace outer lining buffer layer, resulting in a decrease in the strength of the furnace outer lining. resulting in reduced service life

Secondly, because the proportion of quartz sand grain size is single, the grain size of quartz sand and its proportion make the lining density of the furnace body not high, which affects the service life

Furthermore, when the furnace is built, the furnace mouth material does not contain the outer lining material of the furnace. Although the furnace mouth material is also made of quartz sand, refractory mud and water glass, the particle size of the furnace mouth material is 270 mesh quartz sand. to about 40% of the total amount of quartz sand, and the refractory mud in the furnace mouth material does not exceed 50% of the total amount of quartz sand, so that the difference between the lining material of the furnace body and the furnace mouth material is large. The continuous baking process is also adopted. Due to the increased temperature difference between the inside and outside of the furnace mouth, it is difficult to reach the specified temperature during the sintering process. In addition, the top surface of the graphite crucible is basically the same as the top surface of the furnace outer lining, which may easily cause the furnace outer lining and the graphite crucible to be in the furnace. Poor bonding at the mouth, or even cracks, often causes a gap between the graphite crucible and the furnace outer lining to be suspended, reducing the heat conduction and heat dissipation of the inner and outer lining of the furnace, resulting in high energy consumption, reduced smelting efficiency, and even severe cases. The phenomenon of cracking the graphite crucible will affect its service life, and also increase the unsafe factors of operation

However, the continuous power transmission oven takes about 10 hours, which wastes a lot of raw materials and electricity costs, and also increases the cost of furnace construction.

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