Method for removing zinc slag from hot galvanizing liquid

A technology of hot-dip galvanizing and zinc slag, applied in hot-dip plating process, Lorentz force separation, coating and other directions, which can solve the problems of removal efficiency limitation and weak magnetic properties.

Inactive Publication Date: 2006-02-08
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the content of Fe in zinc slag is lower than 12wt.% except surface slag, the magnetic properties are weak at high temperature, so the removal efficiency is greatly limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: Adopting a circular ceramic tube with a pipe diameter of 10 mm and a length of 800 mm, the flow rate of molten zinc is 40 mm / s, and the current density in the ceramic tube is 10 5 A / m 2 At the same time, a stable magnetic field with a magnetic induction intensity of 1T and perpendicular to the current direction is applied through the electromagnet, and the electromagnetic force density is 1×10 in the zinc liquid. 5 N / m 3 , After purification, the zinc slag larger than 20μm can be basically removed.

Embodiment 2

[0016] Embodiment 2: A square-hole ceramic tube with a cross-sectional size of 10mm × 10mm and a length of 500mm is adopted, the flow rate of the zinc liquid is 50mm / s, an alternating magnetic field is applied through a coaxial solenoid coil, the frequency of the magnetic field is 20kHz, and the magnetic induction intensity The effective value is 0.04T, and the maximum electromagnetic force density generated in the zinc liquid is 5×10 5 N / m 3 , After purification, the zinc dross larger than 15 μm can be basically removed, and the removal efficiency of 10 μm zinc dross can reach 70%.

Embodiment 3

[0017] Embodiment 3: Adopt the circular ceramic tube bundle that pipe diameter is 6mm, length is 300mm, and the flow velocity of zinc liquid is 30mm / s, applies traveling wave magnetic field by linear motor, and the moving direction of traveling wave magnetic field is perpendicular to the flowing direction of zinc liquid, gas The magnetic induction intensity in the gap is 0.1T, and the electromagnetic force density generated in the zinc liquid is 1.2×10 5 N / m 3 , the removal efficiency of zinc dross larger than 20μm after purification can reach 90%.

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Abstract

The invention relates to a method for removing zinc slag from hot galvanizing liquid by utilizing the difference of electrical conductivity between zinc slag and zinc liquid, the method comprises exerting electric-magnetic force field through direct or induction modes, building up a pressure gradient in zinc liquid within the ceramic tube, thus bringing directional emigration to the zinc slag with poor conductivity under the action of electromagnetic extrusion pressure exerted by the ambient zinc liquid, as a result, the zinc slag is trapped onto the walls of the ceramic tube.

Description

technical field [0001] The invention relates to a purification method in the technical field of metal smelting, in particular to a method for removing zinc slag in a hot-dip galvanizing solution. Background technique [0002] Hot-dip galvanizing is by far the most common and effective process measure used in steel corrosion protection methods. Hot-dip galvanized steel sheets produced by modern continuous hot-dip galvanizing processes are widely used in light industry, home appliances, construction and automobile industries. Especially in recent years, with the rapid development of the automobile industry, the demand for hot-dip galvanized steel sheets for automobiles continues to increase. In addition to the requirements for corrosion resistance, strength, and deep drawability of automotive sheets, high surface quality is also a basic condition that must be met. Zinc slag in hot-dip galvanizing bath is the most important factor affecting the surface quality of galvanized s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06B03C1/023
Inventor 孙宝德疏达王俊崔健沈建国尹小东
Owner SHANGHAI JIAO TONG UNIV
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