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Continuous and electromagnetic separating method for zinc slag in heat galvanizing liquid

An electromagnetic separation and hot-dip galvanizing technology, which is applied in hot-dip galvanizing process, process efficiency improvement, coating, etc., can solve potential safety hazards, insufficient purification efficiency and effect of zinc pot, inability to purify zinc liquid in zinc pot, etc. problem, to achieve the effect of reducing zinc consumption and zinc slag

Inactive Publication Date: 2009-06-24
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] After searching the literature of the prior art, it was found that the Chinese invention patent with the application number of 200510028882.3 relates to a method of electromagnetic purification of hot-dip galvanizing liquid. The removal of zinc slag is achieved by the exchange of turbulent flow inside the zinc liquid, but most of the zinc liquid in the zinc pot cannot be purified, so it can only work in a local area, and the overall purification efficiency and effect of the zinc pot exist. must be insufficient
In addition, the copper coil of the electromagnetic slag catcher has cooling water in it, and it is immersed in the zinc liquid with a temperature as high as 460°C for a long time, which has a great potential safety hazard

Method used

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  • Continuous and electromagnetic separating method for zinc slag in heat galvanizing liquid
  • Continuous and electromagnetic separating method for zinc slag in heat galvanizing liquid

Examples

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Effect test

Embodiment 1

[0025] In this embodiment, a continuously working zinc liquid pump is used to extract the zinc liquid from the zinc pot, so that the zinc liquid flows into an electromagnetic purification flow tank placed outside the zinc pot. The separation process of zinc dross from zinc liquid is all carried out in the launder. The separation process consists of two parts: primary filtration and secondary filtration. In the primary filtration, a ceramic foam filter is used to remove zinc slag with a particle size greater than 40μm. The alternating magnetic field is applied through the coaxial solenoid coil, the magnetic field frequency is 20kHz, the effective value of the magnetic induction intensity B is 0.03T, the cross-sectional dimension is 10mm×10mm, the length is 200mm square hole ceramic tube, the zinc liquid flow speed is 50mm / s, after purification, zinc dross larger than 20μm can be basically removed. After the zinc liquid flows out of the electromagnetic purification device, it flows...

Embodiment 2

[0027] In this embodiment, a continuously working zinc liquid pump is used to extract the zinc liquid from the zinc pot, so that the zinc liquid flows into an electromagnetic purification flow tank placed outside the zinc pot. The separation process of zinc dross from zinc liquid is all carried out in the launder. The separation process consists of two parts: primary filtration and secondary filtration. In the primary filtration, a ceramic foam filter is used to remove zinc slag with a particle size greater than 40μm. The alternating magnetic field is applied through the coaxial solenoid coil, the frequency of the magnetic field is 20kHz, the effective value of the magnetic induction intensity B is 0.06T, the cross-sectional dimension is 10mm×10mm, the length is 300mm square hole ceramic tube, the zinc liquid flow speed is 40mm / s, after purification, zinc slag larger than 15μm can be basically removed. After the zinc liquid flows out of the electromagnetic purification device, it...

Embodiment 3

[0029] In this embodiment, a continuously working zinc liquid pump is used to extract the zinc liquid from the zinc pot, so that the zinc liquid flows into an electromagnetic purification flow tank placed outside the zinc pot. The separation process of zinc dross from zinc liquid is all carried out in the launder. The separation process consists of two parts: primary filtration and secondary filtration. In the primary filtration, a ceramic foam filter is used to remove zinc slag with a particle size greater than 40μm. The alternating magnetic field is applied through the coaxial solenoid coil, the magnetic field frequency is 20kHz, the effective value of the magnetic induction intensity B is 0.10T, the cross-sectional dimension is 10mm×10mm, the length is 300mm square hole ceramic tube, the zinc liquid flow speed is 35mm / s, after purification, zinc slag larger than 10μm can be basically removed. After the zinc liquid flows out of the electromagnetic purification device, it flows ...

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Abstract

This invention relates to a method for separating Zn dregs in galvanized fluid continuously by electromagnetism including: applying a Zn fluid pump to extract Zn fluid from a Zn boiler to flow into a clarifier launder, in which, dregs are separated in the launder from the fluid in the separation process, the first stage filter uses a foam ceramic filter, and hot galvanized fluid after the first stage filtration flows into a magnetic scummer, which exerts an alternating magnetic field by a coaxial solenoid coil to let Zn fluid in the ceramic tubebe acted by electromagnetic force vertical to the ceramic tube wall, and Zn dregs move along the direction opposite to the magnetic force born by the Zn fluid under the magnetic field to be captured till moving to the wall of the ceramic pipe, the Zn fluid flows from the scummer device t oflow back to a Zn boiler via a pipeline connected with the boiler to finish a continuous clarification process out of the boiler to remove dregs.

Description

Technical field [0001] The invention relates to a method in the technical field of metal smelting, in particular to a method for continuous electromagnetic separation of 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 properties and stamping formability. High surface quality is a quality that hot-dip galvanized steel sheets must have as exterior and interior 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 dross defects are the most important factor that reduces the surface quality of automobile sheets. Zinc dross is the Fe-Al-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/06C22B9/02
CPCY02P10/20
Inventor 孙宝德董安平疏达王俊蔡西川
Owner SHANGHAI JIAOTONG UNIV
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