Hot Galvanized Technology in China
At present the domestic hot galvanized alloy technology is very simple, zinc smelting plant to produce zinc alloy, just add a medium-frequency coreless induction furnace preparation of the intermediate alloy, the original for melting zinc pieces of high-power induction furnace for transformation, in the The center of the furnace to open a hole, add a stirring device, after metering with the middle alloy, mixing, casting can be.
This production mode is characterized by a simple process, the use of existing ingot melting furnace for easy transformation, widely used for the zinc smelter, but the process has several deficiencies:
According to the heating characteristics of a core induction furnace, to have a melt furnace to work. Ie, the minimum height of the metal surface of the furnace must be ensured by immersing the sensing grooves of the inductor. Therefore, each time with a good zinc alloy, can only cast 1/3 or so (that is, the remaining metal surface to ensure that above the level in the Kai melting), you must add zinc melting, re-preparation of the next furnace intermittent melting. When the alloy preparation, mixing and furnace analysis, can only stop heating or insulation, high-power induction furnace continuous melting advantage to play out, the mixer hanging out into the operation of trouble.
As the diameter of the stirring blades is limited by the diameter of the opening (which affects the thermal efficiency), the effect of the small range of stirring on the rectangular hearth is limited, so the agitation is not sufficient and the iron effect of the blade, the uniformity of composition and And the iron content of the requirements have a negative impact.
Need to replace the alloy species, the large-capacity core induction furnace washing furnace is a time-consuming work, change the alloying elements, the furnace needs a long time to complete the continuous operation.
On the electrical and furnace age have an impact when the release of alloy liquid to join a large number of zinc, the lowest temperature, the need for high-power heating; with the intermediate alloy, the temperature needs to rise to the highest in terms of energy consumption and metal burns are not conducive to control.
