At present, the domestic hot-dip galvanizing alloy process is very simple, zinc smelter to produce zinc alloy, only need to add an intermediate frequency coreless induction furnace to prepare the master alloy, the original high-power induction furnace for the melting of zinc sheet transformation, A hole is set in the center of the furnace top and a set of stirring device is added. After metering into the intermediate alloy, mixing and casting can be performed.
This production model is characterized by a simple process, the use of the existing ingot melting furnace is easy to transform, widely used for the zinc smelter, but the process has several deficiencies:
According to the heating characteristics of the cored induction furnace, it is necessary to start the melt furnace to work. That is, the minimum height of the molten metal in the furnace must ensure that the sensing groove of the inductor can be submerged. Therefore, each time a good zinc alloy is prepared, only about 1/3 of the molten zinc can be cast (ie, the remaining metal surface is guaranteed to be above the melting height), then zinc flakes must be added to melt, and the next furnace batch melted. When alloy preparation, stirring, and furnace analysis are performed, heating or insulation can only be stopped, the continuous melting advantage of the high-power induction furnace cannot be realized, and the operation of the agitator to lift the suspension is troublesome.
Because the diameter of the stirring blade is limited by the hole diameter on the top (influence of thermal efficiency), the influence of the small range of stirring on the rectangular furnace is limited, so the insufficient stirring and the iron increasing effect of the blade, the homogeneity of the composition and Both iron and iron content requirements have a negative impact.