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"How to reduce galvalume and galvanizing dross generation"

Current question:

May 12, 2021

Q. Galvalume high top dross in main pot. How can I minimize high top dross in Galvalume pot without reducing my speed (which is 200 MPM) and production? My pot capacity is 60 Mt.

Rahul Borade
- Nagpur Maharashtra India
^

none
adv.
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Closely related historical postings, oldest first:

2003

Q. Regarding to the question of dross forming, how to minimize the dross forming? Does the temperature of the zinc bath influence the dross formation? Or should we put some additive element like aluminium to minimize?

Catherine Sim Li Ling
- Kuching, Sarawak, Malaysia
^


2003

A. Temperature has influence on dross forming (the higher the more iron loss), but with normal galvanizing temperatures (around 450 °C) there is hardly any difference. At a temperature 490-520 °C your kettle is in danger (high iron loss. Aluminium makes zinc more fluid, influences the structure of the alloy layer, reduces zinc-ash forming and gives a better color and gloss of galvanized material. Biggest influence on dross forming is carry over of dissolved iron from pickling via rinse and flux. Finally I have to tell you the whole process is too complicated to explain everything via finishing.com. Maybe you need a galvanizing course.

Dolf van den Berg
Dolf van den Berg
- Leusden, The Netherlands
^


August 3, 2009

Q. How to minimize dross formation?

Sami Allen
- Saudi Arabia
^


August 21, 2009

thumbs up sign Hi, Cousin Sami. Mr. Van den Berg has already invested his time answering that exact question. To show thankfulness for his effort and not run the thread in circles, please try your best to express your question in terms of what he has already said -- and to provide details about your own situation rather than continuing in the abstract. Thanks!

Regards,

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
^


2006 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread

Q. Which of the parameters are responsible for dross generation and how to reduce top and bottom dross? Actually I'm doing a thesis on reduction of dross generation. So I want to know the parameter on which the dross generation depends and also how to reduce the dross generation? Please give the response as soon as possible.

Bharat Kumar Lautre
SLIET COLLEGE OF ENGG - PUNJAB, INDIA
^


2006

A. Dear Mr LAUTRE
Please write the Title of your project, & faculty you belong to. In research you have to carry out a lot of literature survey & potentiality of investigation has to be ascertained. Hearing from you I may provide a little clue, and the rest is your dedication.

BEST WISHES,

Dr. Pradeep kumar Maitra
- BHILAI, Chhattisgarh, INDIA
^


affil. link
"Faults in Hot-Dip Galvanizing"
by Dietrich Horstmann
from Abe Books
or
info on Amazon



affil. link
"Handbook of Hot Dip Galvanization"
by Maass & Peissker
from Abe Books
or


-- this entry appended to this thread by editor in lieu of spawning a duplicative thread

Q. How can we reduce the dross generation in galvanizing line having armco iron pot, with aluminium, lead, antimony, tin, iron, & zinc.

Rajib Chatterjee
- Jamshedpur, Jharkhand, India
^


June 2, 2009

A. Hi, Rajib. Besides the excellent info already posted by Dolf van den Berg above, thread 47534, and thread 49295 look like good continuation points. But give us details of your situation; this is not intended to be a one-directional technology transfer , but an opportunity for us to all learn from each other.

Good luck!

Regards,

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
^



March 31, 2016 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread

Q. I want to know what is the best temperature range for galvanizing to reduce dross formation.

ASHWANI SINGH
- BHOPAL, MP, INDIA
^


March 2016

A. Hi Ashwani. We appended your inquiry to a thread where Dolf has offered his opinion that, if you maintain customary temperatures of about 450 °C, small variations have no effect, but high temperatures like 490-520 °C can be a little problem. Please do your best to pose your ongoing questions in terms of the actual details of your own situation so we can all learn from you :-)

Thanks & Regards,

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
^



February 9, 2019

Q. Greetings, I want to know that what should be the acceptable aluminium %age in top dross and my second question is what is the healthy chemistry of dross in galvanizing?

NAUTY DOGRA
steel business - jamshedpur, jharkhand, india
^


February 2019

thumbsdown Posters! If you want to pay for help, please retain one of the consultants advertising on this page. But for the 4th time on this one short page: if you want this free mutual assistance public forum to help you, your postings have to be helpful for others as well!

Please give us your data, tell us your situation, explain your problems, so we can learn together; don't simply post an abstract request for unidirectional technology transfer -- it chases the particpants away :-)

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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