A circulating cooling deslagging method in continuous hot dip of zinc-aluminium alloys

Abstract

The invention relates to a method in the field of metal smelting technology, particularly to a circulating cooling deslagging method in continuous hot dip of zinc-aluminium alloys. The method is characterized by placing a circulating cooling deslagging apparatus in zinc-aluminium liquid in a galvanized zinc pot, wherein the apparatus has an internal temperature lower than the temperature of the zinc-aluminium liquid in the galvanized zinc pot and is provided with a circuitous groove inside and a zinc dross collector at the bottom, with the circuitous groove being open-ended at two ends, provided with a zinc-aluminium liquid driving device at an inlet and embedded with a honeycomb-shaped cooling pipe equipped with an inlet and an outlet; driving the zinc-aluminium liquid to enter the circuitous groove from the inlet of the circuitous groove, pressing molten metal liquid with low temperature and low melting point in the honeycomb-shaped cooling pipe to cool the zinc-aluminium liquid in the circuitous groove when the zinc-aluminium liquid flows through the circuitous groove, reducing the temperature of the zinc-aluminium liquid for the precipitation and growth of the zinc dross from the zinc-aluminium and deposition of the zinc dross in the zinc dross collector at the bottom, and completing the deslagging and purifying of the zinc-aluminium liquid after the zinc-aluminium liquid, from which the zinc dross is precipitated, flows back to the galvanized zinc pot through the outlet of the circuitous groove. The method in the invention can effectively remove the zinc dross in a zinc bath.

Description

technical field [0001] The invention relates to a method in the technical field of metal smelting, in particular to a method for removing slag by circulating cooling in continuous hot-dip galvanized aluminum. Background technique [0002] Hot-dip galvanizing is a more effective and convenient steel anti-corrosion method. Its coating has excellent sacrificial anti-corrosion effect; hot-dip aluminum coating is compact and has a long service life; The characteristics and cathodic protection characteristics of zinc, the performance of the coating is superior to that of a single element coating, and the anti-corrosion performance is several times higher than that of pure zinc coating, so it is widely used. Because galvanized aluminum sheets, such as Galvalume coated steel sheets, have excellent comprehensive properties and Beautiful appearance, there is a tendency to replace aluminum-coated sheets and some galvanized steel sheets with this coated sheet abroad, forming a zinc-alum...

AI Technical Summary

Problems solved by technology

[0003] At present, a serious problem on the hot-dip galvanizing production line is the zinc slag problem. Compared with the zinc pool, the composition of the zinc pool changes greatly, especially when silicon and other elements are added to the zinc-aluminum pool, which will make the phase relationship more complicated; the zinc slag phase in the zinc-aluminum-zinc pool contains Zinc FeAl3 and Fe-Al-Si intermetallic compound, compared with hot-dip pure zinc zinc pool density, zinc-aluminum pool density is smaller, 55% Al-Zn zinc-aluminum pool is about 1/2 of pure zinc plating; therefore, it is easier to form suspended dross and bottom dross in zinc-aluminum pools, and the causes and influencing factors of zinc dross are much more complicated than those in hot-dip pure zinc-zinc pools; Many production lines have zinc dross problems that plague people. For example, Bluescope Steel in Australia has three Galvalume production lines that have serious zinc dross problems. Many domestic Galvalume production lines also have zinc dross problems.

[0004] The main problems of zinc-aluminum products

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