Authors: Dong, A. P.¹; Da, Shu¹; Wang, J.¹; Sun, B. D.¹; Shen, J. G.²; Ren, Y. S.²; Lu, Y. L.²; Yin, X. D.²

Source: Ironmaking & Steelmaking, Volume 36, Number 4, May 2009 , pp. 316-320(5)

Publisher: Maney Publishing

Abstract:

Dross in zinc pots is the most important factor that impairs the surface quality of hot dip galvanising automobile steel sheet. Separation behaviour of zinc dross from galvanising melts of different Al concentrations (0·12, 4·5 and 55·0 wt-% by an alternating magnetic field has been investigated in order to reduce the dross defects on steel sheets. The properties of different zinc drosses were investigated by means of EDAX and the quantitative metallographic method and the conductivities were measured by physics property measurements system. The experimental results show that the zinc dross in different hot dip galvanising melts has different morphologies, compositions and structures, and the average particle size of the dross increases with the Al concentration. In the case of extra iron (above the solubility limit) in the zinc melt, zinc dross quantity also increases with the Al concentration. All of the three types of zinc dross particles >5 ?m can be successfully separated when the magnetic frequency is 17·5 kHz, effective magnetic flux intensity is 0·05 T, imposed time is 15 s and the cross-section of the ceramic square pipe is 5 × 5 mm.

Keywords: ZINC DROSS; ELECTROMAGNETIC SEPARATION; HOT DIP GALVANISING; ALUMINIUM

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/174328108X393812

Affiliations: 1: The State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai 200240, China 2: Research and Development Centre of Baosteel, Shanghai 201900, China

Publication date: 2009-05-01

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