Composite purification device for continuously removing zinc slag in heat zinc coating liquid

Abstract

A combined purification apparatus is provided for continuously removing zinc dross from molten zinc in hot dip galvanization, which belongs to the field of metal smelting technique. The apparatus comprises a molten zinc delivery device, a first-step filter, and a second-step electromagnetic deslagging device. The molten zinc delivery device comprises a molten zinc pump and a molten zinc flow channel. The first-step filter is a ceramic foam filter. A zinc pumping pipe of the molten zinc pump is immersed into a zinc pot. The ceramic foam filter is arranged inside the molten zinc flow channel. The second-step electromagnetic deslagging device is arranged in the middle inside the molten zinc flow channel, and comprises an induction coil, a porous ceramic pipe, a heat-insulating jacket, and a fire-resisting shell, wherein the porous ceramic pipe is arranged inside the induction coil; the heat-insulating jacket is used to isolate the induction coil from the porous ceramic pipe; the induction coil, heat-insulating jacket and porous ceramic pipe are all arranged inside the fire-resisting shell. The invention can efficiently remove zinc dross from molten zinc in hot dip galvanization at the early formation stage, and helps to reduce the zinc slag defect of steel work piece in hot dip galvanization and improve the surface quality.

Description

technical field [0001] The invention relates to a device in the technical field of metal smelting, in particular to a composite purification device for continuously removing zinc dross in a hot-dip galvanizing bath. Background technique [0002] Corrosion is an important way of material loss, and the loss of steel materials due to corrosion reaches tens of millions of tons every year. Steel materials used in bridges, construction, construction machinery, shipbuilding and other fields have special requirements for corrosion resistance. Hot-dip galvanizing can effectively improve the corrosion resistance of steel, so it is widely used in electric power, transportation, automobile, construction, chemical and other industries. Hot-dip galvanized steel requires high surface quality, otherwise it will directly affect the performance and service life of subsequent processing workpieces. [0003] The zinc slag produced during the hot-dip plating of the steel plate in the zinc pot ...

AI Technical Summary

Problems solved by technology

Slagging is not only helpless to the harmful bottom slag and suspended slag, but also entrains a large amount of pure zinc, resulting in waste of resources and increasing the cost of hot-dip galvanizing

[0005] After searching the literature of the prior art, it was found that the Chinese invention patent with the application number of 200510028881.9 relates to an electromagnetic purification device for hot-dip galvanizing liquid. The exchange effect of the flow makes the zinc liquid continuously flow through the porous ceramic tube in the device. In the process, the zinc slag is deposited on the wall of the ceramic tube under the action of the electromagnetic field to realize the continuous removal of the zinc slag, but the disadvantage is that the zinc slag cannot be removed. Most of the zinc liquid in the pot participates in the purification, so it can only work in a local area, and there are certain deficiencies in the overall purification efficiency and effect of the zinc pot

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