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"Remove slag/dross of zinc from hot dip galvanizing"



Current question:

July 16, 2021

Q. Sir please guide us about ash box. What do we mean by "ash box manual or motorised". Any photo and description of the same would help. Where can we get this ash box? In plant I am facing excessive ash issue.

Vikash goel
President - Kolkata india
^


July 2021

A. Hi Vikash. We have several threads about ash boxes and ash reduction. Please see thread 57810, "Methods of Ash Removal from Galvanizing Bath" where Geoff Crowley and Dr. Cook discuss ash removal equipment, thread 41571, "Converting from Wet Galvanizing to Dry Galvanizing" where Dr. Cook offers estimates of reasonable ash production and how to keep it under control, and thread 47534, "Galvanising - Reduce & Recover Zinc Ash and Dross" where both aspects are discussed at good length. Or search the site for what you are looking for. But, sorry, we don't suggest vendors or sources for ash boxes or other products on this site (why?)

Luck & Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Aloha -- an idea worth spreading
finishing.com - Pine Beach, New Jersey
^




Closely related Q&A's, oldest first:

2005

DEAR SIR

I want to prepare a mixture to remove slag of zinc from hot dip galvanizing in lab.

Suah Saeed Naoom
- Baghdad, Iraq
^


2005

What do you mean by "SLAG OF ZINC." If you mean DROSS then you need a dross scoop. If you mean DRY ASH then you skim it off and put it into a barrel. If you mean WET SKIMS then you skim it off and put it into a barrel. There are some agents when help reduce dry ash and there are manual ash boxes and motorized ash boxes. They reduce dry ash down to 1/2 and 1/4 respectively.

Regards,

Dr. Thomas H. Cook
Galvanizing Consultant - Hot Springs, South Dakota, USA
^


August 4, 2008

Q. I mean to prepare a mixture which can remove the slag in molten zinc to get a pure zinc.

suha saeed naoom [returning]
- baghdad -iraq
^


July 2021

A. "Remove the slag" to where, Suha? It seems that Dr. Cook is telling you that the dross & ash are already separate from the molten zinc and you need to physically remove them. I think we are not understanding where you think a chemical can put them aside from floating to the top or sinking to the bottom.

Luck & Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Aloha -- an idea worth spreading
finishing.com - Pine Beach, New Jersey
^

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