The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 18, 1982
Filed:
Feb. 26, 1981
Applicant:
Inventors:
Wolfgang Fennemann, Karben, DE;
Jurgen Haldorn, Oberursel, DE;
Assignee:
Metallgesellschaft Aktiengesellschaft, Frankfurt am Main, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C23G / ;
U.S. Cl.
CPC ...
134 13 ; 210712 ; 210737 ; 423 72 ;
Abstract
A process for regenerating a spent HF-HNO.sub.3 pickle which contains ZrF.sub.4, which comprises heating said spent pickle to above 40.degree. C., adding dissolved NaOH to said so-heated pickle, thereafter cooling said so-treated pickle to a temperature below 20.degree. C. whereby to precipitate Na.sub.2 ZrF.sub.6 and removing said Na.sub.2 ZrF.sub.6 from said so-cooled pickle whereby to regenerate the same.