Hydrometallurgical process for waste materials of the zinc and steel industries

Teppo Riihimäki; Pirkka-Pekka Ollonqvist; Pertti Koukkari

Hydrometallurgical process for waste materials of the zinc and steel industries

Teppo Riihimäki (Inventor)
, Pirkka-Pekka Ollonqvist (Inventor)
, Pertti Koukkari (Inventor)

BA5203 Metals and materials recovery

Research output: Patent › Patent

Abstract

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, and then leaching the acid-treated material, neutralizing the acid of the leach solution, recovering zinc from the neutralized ferrous iron-containing solution, recovering iron from the thus obtained solution, and circulating at least a fraction of the raffinate solution obtained from the iron recovery back to the leaching step.

Patent family as of 17.7.2026
EP4433619 A1, EP4433619 B1, EP4433619 C0, ES3068759 T3, FI130580 B, FI20216173 A, PL4433619 T3, US2025034677 AA, WO23089234 A1

Original language	English
Patent number	EP4433619 B1
IPC	C22B11/00
Priority date	16/11/21
Filing date	15/11/22
Publication status	Published - 15 Apr 2026
MoE publication type	H1 Granted patent

Cite this

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abstract = "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, and then leaching the acid-treated material, neutralizing the acid of the leach solution, recovering zinc from the neutralized ferrous iron-containing solution, recovering iron from the thus obtained solution, and circulating at least a fraction of the raffinate solution obtained from the iron recovery back to the leaching step. Patent family as of 17.7.2026 EP4433619 A1, EP4433619 B1, EP4433619 C0, ES3068759 T3, FI130580 B, FI20216173 A, PL4433619 T3, US2025034677 AA, WO23089234 A1",

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T1 - Hydrometallurgical process for waste materials of the zinc and steel industries

AU - Riihimäki, Teppo

AU - Ollonqvist, Pirkka-Pekka

AU - Koukkari, Pertti

PY - 2026/4/15

Y1 - 2026/4/15

N2 - 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, and then leaching the acid-treated material, neutralizing the acid of the leach solution, recovering zinc from the neutralized ferrous iron-containing solution, recovering iron from the thus obtained solution, and circulating at least a fraction of the raffinate solution obtained from the iron recovery back to the leaching step. Patent family as of 17.7.2026 EP4433619 A1, EP4433619 B1, EP4433619 C0, ES3068759 T3, FI130580 B, FI20216173 A, PL4433619 T3, US2025034677 AA, WO23089234 A1

AB - 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, and then leaching the acid-treated material, neutralizing the acid of the leach solution, recovering zinc from the neutralized ferrous iron-containing solution, recovering iron from the thus obtained solution, and circulating at least a fraction of the raffinate solution obtained from the iron recovery back to the leaching step. Patent family as of 17.7.2026 EP4433619 A1, EP4433619 B1, EP4433619 C0, ES3068759 T3, FI130580 B, FI20216173 A, PL4433619 T3, US2025034677 AA, WO23089234 A1

UR - https://fi.espacenet.com/publicationDetails/biblio?II=0&ND=3&adjacent=true&locale=fi_FI&FT=D&date=20250130&CC=US&NR=2025034677A1&KC=A1

M3 - Patent

M1 - EP4433619 B1

Y2 - 2022/11/15

ER -

Hydrometallurgical process for waste materials of the zinc and steel industries

Abstract

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