Metal finishing Q&As since 1989

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Problem in Zinc Oxide recovery from galvanizing

We are producing Zinc Oxide from the top drosses of galvanising industries containing 2% Al, 2% Fe and 0.5% Pb using a melter & evaporator followed by cyclones & bag house. The molten alloy containing enriched impurities in Zn settles at the bottom which is tapped periodically. After a few tappings it starts freezing at the tap-hole rendering tapping almost impossible leading to a complete plant stoppage. Help is required tofix the problem.

The temp maintained is 1200 °C in the evaporator.

G Balaji
Consultant - India
2004

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Please let me know what kind of melter you are using?
I mean is it gas, oil or electrical fired?

PS Sitaram
- Mombasa, Kenya
2005

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2005

Dear sir.

discussion on zinc oxide 99.05 ceramic grade
manufacturing process and Production Equipments and row materials required pl.let me know for lend area required for the production capacity Per day 1000 kg .please send detailed information as eary as possible.

Thanking you,

Manahar Patel
dhartidhan minerals - Morbi, Gujarat, India

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2006

Dear G Balaji,

This thick freezed material is ternary alloy of Zn-Al-Fe who's melting temp is more than 1300 degrees. The dross should be treated before it is used for making zinc oxide. The problem is 100% cureable but it is not so easy to discuss in this way. I need full details about the process.

Qaiser Majid
Lahore, Pakistan