No passwords, no registration, no paywalls, no popups, no AI

As an Amazon Associate & eBay Partner we earn from affil links

finishing.com -- The Home Page of the Finishing Industry

Search our quarter-million Q&As

Home of the finishing HOTLINE 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
Saify Ind

Bengaluru, Karnataka, India

1999

Sorry! Finishing.com is temporarily Read-Only.
Ted Mooney is retiring but I have several offers to take it over.
We're working hard to make sure we find it the best new home.

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: