Processing of Industrial Metal-Containing Waste Materials

Pertti Koukkari (Inventor), Jussi Rastas (Inventor), Pekka Saikkonen (Inventor), Väinö Hintikka (Inventor)

    Research output: PatentPatent


    The present invention relates to a process for separating metals using a series of precipitations from waste materials of the zinc or steel industry, or both. The method is characterized in carrying out the precipitations using hydroxides or sulfur-containing chemicals selected from sulfates, sulfides, sulfur oxides and sulfites, or both, in order to obtain metal precipitates as well as an aqueous sulfur-containing solution, the latter optionally being recycled in the process, whereafter a final precipitate is carried to a thermal step, for forming.

    Patent family as of 20.12.2021
    EP3555327 A1 20191023 EP20170880716 20171215      
    EP3555327 A4 20200812 EP20170880716 20171215      
    FI128281 B 20200228 FI20160005972 20161215      
    FI20165972 L 20180616 FI20160005972 20161215      
    WO18109283 A1 20180621 WO2017FI50901 20171215

    Link to currentpatent family on right 

    Original languageEnglish
    Patent numberFI128281B
    IPCC22B 19/ 30 A I
    Priority date15/12/16
    Publication statusPublished - 28 Feb 2020
    MoE publication typeH1 Granted patent


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