US Patent Issued to Teknologian tutkimuskeskus VTT on Nov. 3 for "Hydrometallurgical process for waste materials of the zinc and steel industries" (Finnish Inventors)

ALEXANDRIA, Va., Nov. 3 -- United States Patent no. 12,781,306, issued on Nov. 3, was assigned to Teknologian tutkimuskeskus VTT Oy (Espoo, Finland).

"Hydrometallurgical process for waste materials of the zinc and steel industries" was invented by Teppo Riihimaki (Espoo, Finland), Pirkka-Pekka Ollonqvist (Espoo, Finland), Pertti Koukkari (Espoo, Finland) and Jussi Rastas (Espoo, Finland).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a process for recovering zinc and iron products from zinc-containing waste materials obtained from the zinc or steel industry, or both, by first treating the waste material(s) with strong acid, to convert any zinc ferrites into leachable compounds...