Patent · US Expired

Method of regenerating ZrF.sub.4 pickling solutions

US4937054A · kind A · utility

1Cited by

2References

26Claims

0Family size

Assignee

Metallgesellschaft AG · DE

Inventors

Wolfgang Fennemann · Karben, DE
Erich Minzl · Alzenau, DE
Horst Seidel · Frankfurt, DE

Key dates

Filing date	Feb 24, 1989
Grant date	Jun 26, 1990
Priority date	—
Expiry date	Feb 24, 2009

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC23G1/36
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

A process is disclosed for the regeneration of pickling solutions which contain ZrF.sub.4 by addition of a Na compound in which a charge of the pickling solution to be regenerated is analyzed and heated. The amount of Na required for the regeneration is determined in each case and is admixed with intense stirring. Then the mixture is cooled, the precipitated NaZrF compounds are separated and a regenerated pickling solution is recovered.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.