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:
Dec. 30, 2025
Filed:
Jun. 16, 2021
Yara International Asa, Oslo, NO;
Patrycja Kita, Poznan, PL;
Tanja Vojnovic, Skien, NO;
Lene Sund, Porsgrunn, NO;
Katrine Lie Bøyesen, Skien, NO;
Tom Rames Jørgensen, Porsgrunn, NO;
YARA INTERNATIONAL ASA, Oslo, NO;
Abstract
A method comprising a) mixing and dissolving the solid hazardous heavy metal-containing composition with an acid solution; b) precipitating the heavy metal from the hazardous heavy metal acid compositions by; c) precipitating the heavy metal from the hazardous heavy metal acid composition with a heavy metal-precipitation agent; and d) separating out the heavy metal precipitate from the aqueous supernatant, whereby the heavy metal-precipitation agent comprises a diorgano-dithiophosphinic acid or the alkali metal or ammonia salts thereof.