Valorisation of Separated Solids from Mine Water Treatment

Tommi Kaartinen, Petteri Kangas, Mona Arnold

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


    This paper describes two concepts for simultaneous recovery of magnesium and removal of sulphate from mine effluent. Treatment of mixed gypsum sludge generated in sulphate removal by lime precipitation containing roughly 2/3 of gypsum and 1/3 of magnesium hydroxide was treated with CO2 to separate Mg from Ca. Another concept utilizes selective precipitation of Mg before any sulphate removal measures to recover as pure magnesium hydroxide as possible. In terms of Mg recovery, the latter concepts seems more promising, but it has impacts on sulphate removal with regards to increased chemical consumption.
    Original languageEnglish
    Title of host publicationProceedings of the 13th international Mine Water Association Congress
    Subtitle of host publicationIMWA 2017
    EditorsChristian Wolkersdorfer, Lotta Sartz, Mika Sillanpää, Antti Häkkinen
    Place of PublicationLappeenranta
    PublisherLappeenranta University of Technology
    ISBN (Print)978-952-335-065-6
    Publication statusPublished - 2017
    MoE publication typeA4 Article in a conference publication
    Event13th International Mine Water Association Congress, IMWA 2017, Mine Water and Circular Economy - Lappeenranta, Finland
    Duration: 25 Jun 201730 Jun 2017


    Conference13th International Mine Water Association Congress, IMWA 2017, Mine Water and Circular Economy
    Abbreviated titleIMWA 2017


    • sulphate removal
    • magnesium
    • valorisation
    • recovery


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