The fundamental research on suspended dross in hot dip Al–Zn galvanising process

Author:

Chu Rensheng1,Wang Zhe1,Sun Ningjie1,Deng Xiaoxuan2,Xu Chengliang34,Guo Zhancheng1

Affiliation:

1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, China

2. Shougang Group Co., Ltd., Research Institute of Technology, Beijing, China

3. Beijing Engineering Research Center of Energy Steel, Beijing, China

4. Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Technology, Beijing, China

Abstract

In this research, supergravity enrichment experiment was conducted to determine compounds in suspended dross and to analyse density of the suspended dross in the hot-dip Al–Zn (ZA) melt. It was found that the suspended dross was composed of Al–Fe–Si–Zn intermetallic compounds (IMCs), mixtures of Fe2Al5Zn0.4 and Alx–Fe3–Siy with various Al and Si contents. The density of suspended dross was small compared with the molten hot-dip ZA liquid. After being quenched in water, the morphology of the suspended dross was confirmed as polygonal granular structures. Thermodynamics was applied to explain why there were various morphological structures of the suspended dross in the solidified hot-dip ZA melt. This research had also demonstrated that it was technically feasible to separate the suspended dross from the molten hot-dip ZA melt in a supergravity field.

Publisher

SAGE Publications

Reference21 articles.

1. Willis DJ, Setargew N. Bottom Dross Formation Mechanisms in Zincalume Coating Line Pots. Seoul: InterZAC, 2002, pp. 1–17.

2. Garcı´a F, Salinas A, Nava E, et al. Characterization of Dross Particles in an Industrial Galvalume Coating Bath. Chicago: Galvatech, 2004, pp. 1–8.

3. Setargew N, Willis DJ, Thompson D. Detection of Dross Intermetallic Particles in 55%Al-Zn Melt Using Lais. Seoul, Korea: InterZAC, 2004, pp. 1–16.

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