Dual channel electromagnetic method for separating zinc dross from hot galvanizing zinc fluid

Abstract

This invention discloses a double-channel electromagnetic method for separating zinc residue from hot-plating zinc solution. The method comprises: sucking out zinc solution from a kettle with a pump that can continuously run, introducing into a double-channel electromagnetic purification flow groove outside the kettle, performing primary filtration with a foamed ceramic filter, introducing into an electromagnetic purification apparatus, performing secondary filtration via applying an alternate magnetic field, and returning into the kettle via a pipeline. Both the primary and the secondary filtration processes are performed in the double-channel electromagnetic purification flow groove, in which there are an electromagnetic valve, a primary filter and a secondary filtration electromagnetic purification apparatus inside either channel. During the purification process, more and more zinc residues are attached to the ceramic tube wall, so the ceramic tube should be replaced when accumulated zinc residues reach a certain quantity. The ceramic tube is replaced by: tswitching off the electromagnetic valve at the front end of one channel to cut off the communication of the zinc solution, and meanwhile switching on the electromagnetic valve at the front end of the other channel. The method can continuously purify for 6 h, reduce the content of zinc residues suspending in the zinc solution by more than 90%, and decrease zinc consumption by 12%.

Description

technical field [0001] The invention relates to a method in the technical field of metal smelting, in particular to a double-channel electromagnetic separation method for zinc slag in a hot-dip galvanizing bath. Background technique [0002] Hot-dip galvanized steel sheets are widely used in the automotive industry due to their good corrosion resistance, weldability, coating and stamping properties. High surface quality is a must-have quality for hot-dip galvanized steel sheets as inner and outer panels for automobiles. Although the surface quality of hot-dip galvanized automotive sheets has been greatly improved in recent years, it is still a serious challenge to produce hot-dip galvanized sheets for automobiles without surface defects. [0003] Among the defects that affect the surface quality of hot-dip galvanized automobile sheets, zinc slag defects are the most important factor that reduces the surface quality of automobile sheets. Zinc slag is the Fe-Al-Zn ternary in...

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Problems solved by technology

However, the disadvantage of the method described in this patent is that most of the zinc liquid in the zinc pot cannot participate in the purification, and when the zinc slag absorbed by the wall of the ceramic pipe immersed in the zinc liquid accumulates to a certain amount, the ceramic pipe must be cleaned. Replacement, at this time, the electromagnetic purification can only be interrupted, and the continuous separation of zinc slag in the hot-dip galvanizing solution cannot be achieved, and there are certain deficiencies in the overall purification efficiency and effect of the zinc pot

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