No passwords, No popups, No cost, No AI
we earn from your eBay & Amazon purchases

Home /
T.O.C.
Fun
FAQs
Good
Books
Ref.
Libr.
Adver-
tise
Help
Wanted
Current
Q&A's
Site 🔍
Search
curated with aloha by
ted_yosem
Ted Mooney, P.E. RET
- Pine Beach, NJ
finishing.com -- The Home Page of the Finishing Industry


  pub
  The authoritative public forum
  for Metal Finishing since 1989

-----

Galvanising Ash Generation Benchmarking




November 26, 2008

I would like to know which are the best figures for Zn ash generation expressed as grs/ sq. m..
And, which are the best practices to keep these figures the lowest?

Thanks in advance and regards,

Arturo Blanco
- Monterrey, Mexico



November 28, 2008

You should be more specific in your question - or define it better.
Ash production in what type of galvanizing? Continuous strip or jobbing hot dip?
Per square metre of what? zinc surface area? Of steel dipped? Of shop floorspace?

Different types of galvanizing use different methods of measuring ash production.
For example some jobbing hot dip galvanizers measure in kg ash produced per tonne of steel galvanized, some in kg per tonne of zinc consumed.

And the rate of production is very dependent on the type of material being coated, and the fluxing system in use.

geoff_crowley
Geoff Crowley
Crithwood Ltd.
Westfield, Scotland, UK
crithwood logo



Sir:

For a "dry" kettle the usual ash generation is about 0.8% of production for no ash box, 0.4% of production for a manual ash box, and 0.2% of production for a motorized ash box. This would be for a weighted average steel thickness of about 0.17 inches. "MZR" zinc/ash recovery machines usually yield about 0.2% of production for ash.

Causes of excessive ash include: bad flux, sinking skimmers, excessive skimming, too much or too little aluminum in the zinc, poorly pickled steel, excessive oil on the product, etc.

What do you have now for ash production based on galvanized product and what is the weighted average steel thickness?

Regards,

Dr. Thomas H. Cook
Galvanizing Consultant - Hot Springs, South Dakota, USA
December 1, 2008



Dr. Thomas H. Cook
Thank you very much for your kind answer

Geoff:
Thanks for your answer, and I am sorry I didn't specify the product / method: it's hot dipping steel pipe.
Regards,

Arturo Blanco
- Monterrey, NL Mexico
December 6, 2008



Typical ash production for jobbing hot dip galvanizng is about 0.5 to 0.8% expressed as weight of ash divided by weight of steel galvanized.

geoff_crowley
Geoff Crowley
Crithwood Ltd.
Westfield, Scotland, UK
crithwood logo
December 8, 2008


none
adv.
this text gets replaced with bannerText
spacer gets replaced with bannerImages



(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories:

Finishing
Jobshops
Capital
Equipment
Chemicals &
Consumables
Consult'g,
& Software


About/Contact  -  Privacy Policy  -  ©1995-2024 finishing.com, Pine Beach, New Jersey, USA  -  about "affil links"