Liquid zinc purification device and purification method thereof

Abstract

The invention discloses a zinc liquid purifying device and method. The zinc liquid purifying device comprises a zinc pot, a foam ceramic purifying chamber, a heat preservation chamber, electromagneticpurifying channels and a zinc liquid return pipe. The zinc liquid purifying method comprises the following steps that a zinc liquid pump continuously pumps zinc liquid from the zinc pot to the outside of the zinc pot, and the zinc liquid enters the foam ceramic purifying chamber with a liquid level gauge through a pipeline; the zinc liquid enters the middle heat preservation chamber from a zinc liquid flow outlet in the bottom of the foam ceramic purifying chamber; and the zinc liquid is controlled by a channel gate of the heat preservation chamber to flow to different electromagnetic purifying channels for electromagnetic purifying so as to remove small particle zinc slag, and then the zinc liquid flows back into the zinc pot to realize continuous removal of the zinc slag. The zinc liquid purifying device and method have the beneficial effects that a foam ceramic cylinder is used for filtering big particle zinc slag, the filtering area is greatly increased, and removal rate of the zinc slag is improved; and the enough big middle heat preservation chamber is used for dividing the operations of online changing the foam ceramic cylinder and online changing a flat-shaped electromagnetic purifying mesh ceramic, the operations do not influence each other, and the continuity of removal of the zinc slag is fully ensured.

Description

technical field [0001] The invention relates to the field of hot-dip galvanizing, in particular to a method and a device for purifying zinc slag in a zinc pot. Background technique [0002] Modern iron and steel enterprises generally adopt the continuous hot-dip galvanizing process for the production of home appliance panels, construction panels, and automotive panels. , Gradually develop a variety of coating products with higher corrosion resistance and deep drawing pulverization resistance, such as common alloy coatings such as GA (Galvaneal), GF (Galfan), and GL (Galvalume). However, the technical progress of hot-dip galvanized steel sheets is not limited to the improvement of the corrosion resistance of the coating, such as home appliance panel steel and automotive outer steel, which have put forward high requirements for high surface quality. Although the surface quality of, for example, automotive exterior steel has been greatly improved in recent years, the productio...

AI Technical Summary

Problems solved by technology

Although this patent combines multiple methods such as foam ceramic filtration, electromagnetic purification filtration, and centrifugal filtration to improve the removal efficiency of zinc slag, it is recognized that the porous ceramics that are adsorbed by foam ceramic filtration and electromagnetic purification filter accumulate on the zinc slag. When a certain amount must be replaced, the electromagnetic purification can only be interrupted at this time, and the continuous separation of zinc slag cannot be achieved; at the same time, the patent does not specify the size limit of the electromagnetic filtration and centrifugal drums, especially the circular drum. If the size is too large, the electromagnetic field has an electromagnetic penetration depth, and the electromagnetic field cannot filter the zinc liquid inside the drum, and its zinc dross removal efficiency is greatly reduced

Patents CN201220493024.1, CN201220492716.4, and CN201220488069.X disclose a zinc pot with an electromagnetic induction coil and a basket. Although it can be replaced quickly, it is still not a continuous removal, and there are also large baskets and electromagnetic field penetration. The contradiction of small depth, the removal efficiency of zinc slag is not high

The zinc slag electromagnetic purification method and device disclosed in Chinese patents CN200510028882.3, CN200510028881.9, CN200710038602.6, and CN200920067316.7 also cannot realize continuous removal of zinc slag

Chinese patents CN200710041706.2 and CN200710041702.4 disclose a dual-channel zinc slag electromagnetic purification method and device. Although the continuous purification of zinc slag can be fully realized, the dual-channel system of this patent requires a completely independent electromagnetic system. Otherwise, online switching cannot be realized, which increases the complexity and cost of the system

Bottom slag generally has larger particles and a density greater than that of the zinc liquid, which will continuously deposit on the bottom of the zinc pot and can be cleaned regularly; surface slag has smaller particles and a lower density than the zinc liquid, and floats on the surface of the zinc liquid. The slag is removed in time; the particles and density of the suspended slag are between the surface slag and the bottom slag. In the existing hot-dip galvanizing technology, it cannot be removed online. Therefore, compared with the surface slag and bottom slag, the suspended slag has a greater The effect of surface quality is also significant

Images