Status of hot dip galvanizing process
Release date：2018-06-28 author： click：
At present, the domestic hot-dip galvanizing alloy process is very simple. The zinc smelting plant needs to produce zinc alloy. It only needs to add an intermediate frequency coreless induction furnace to prepare the intermediate alloy, and transform the high-power induction electric furnace originally used for melting zinc sheets. A hole is formed in the center of the furnace roof, a set of stirring device is added, and the intermediate alloy is metered, stirred and mixed, and cast.
This production mode is characterized by simple process, easy modification by existing ingot melting furnace, and widely used in zinc smelting plants, but the process has several shortcomings:
According to the heating characteristics of the core induction furnace, it is necessary to have a melting furnace to work. That is, the minimum height of the molten metal surface in the furnace must ensure that the sensing grooves of the sensing body can be immersed. Therefore, each time a furnace of zinc alloy is prepared, only about 1/3 of the casting (that is, the remaining metal level is guaranteed to be above the melting height) must be added to the zinc sheet to melt and re-form the batch to melt. When alloy preparation, agitation and pre-furnace analysis are carried out, heating or heat preservation can only be stopped, and the continuous melting advantage of the high-power induction furnace cannot be exerted, and the lifting and hoisting operation of the agitator is troublesome.
Since the diameter of the agitating blade is restricted by the opening diameter on the top (affecting the thermal effect), the effect of a small range of agitation on the rectangular grate is limited, so the agitation is insufficient and the iron-increasing effect of the blade, the uniformity of the composition and Both the iron content requirements have a negative impact.
When it is necessary to replace the alloy type, it is a time-consuming and laborious task to wash the large-capacity cored induction furnace. When the alloying elements are changed, the furnace needs a long time continuous operation to complete.
It has an influence on the electrical appliance and the age of the furnace. When the alloy liquid is added to a large amount of zinc flakes, the temperature is the lowest, and high-power heating is required. When the intermediate alloy is blended, the temperature needs to rise to the highest, which is disadvantageous in terms of energy consumption and metal burning loss. control.