No registration, no passwords; no pop-up ads -- just aloha, fun, & authoritative answers.
As an eBay Partner & Amazon Affiliate we receive compensation for qualifying purchases.
Home /
T.O.C.
FAQs
 
Good
Books
Ref.
Libr.
Advertise
Here
Help
Wanted
Current
Q&A's
Search 🔍
the Site
pub  Where the world gathers for
plating, anodizing, & finishing Q&As since 1989





-----

Regenerating HCl pickling acid in hot dip galvanizing industry




Could someone advise us how to regenerate pickling acid (HCl) in the hot dip galvanizing industry...enhancing probably some product? i.e., Can the rough mixture FeCl2, FeCl3 be used as coagulant? is it possible in drinkable water treatment? What do you think of oxidizing it into iron sulphate which is said to be strongly recommended as fertilizer...

Achraf Bouzgarrou
- Tunisia
1999



Dear Mr Achraf,

Try adding about 5 % of sulfuric acid to the dead HCl bath.

It does revive the pickling activity of spent HCl baths to an extent and the bath life can be prolonged for some more time by dosing sulfuric. Careful not to add too quickly.

Regards

Khozem Vahaanwala
Khozem Vahaanwala
Saify Ind
supporting advertiser
Bengaluru, Karnataka, India
saify logo
1999




(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:

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


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