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:
Feb. 22, 2022
Filed:
Dec. 18, 2020
Applicant:
Crisolteq Ltd, Harjavalta, FI;
Inventors:
Assignee:
CrisolteQ Ltd, Harjavalta, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01G 53/00 (2006.01); C01G 53/10 (2006.01); C01F 5/40 (2006.01); C22B 7/00 (2006.01); C22B 3/00 (2006.01);
U.S. Cl.
CPC ...
C01G 53/10 (2013.01); C01F 5/40 (2013.01); C01G 53/003 (2013.01); C22B 7/006 (2013.01); C22B 23/04 (2013.01);
Abstract
A novel process for treating pickling acid residue and recovering sulfates and nickel therefrom has been developed. By lowering the pH of a magnesium compound slurry to 4-5.5 with sulfuric acid containing pickling acid residue in the presence of ammonium sulfate, both magnesium sulfate and nickel sulfate are solubilized. Magnesium sulfate and nickel sulfate solution is separated from the solids by filtration and an iron hydroxide and chromium hydroxide residue is obtained as a precipitate. Magnesium sulfate and nickel sulfate are then separated from the solution.