Effect of Seeding on Metal Ion Recovery from Wastewater by Reactive Crystallization of Metal Carbonates

Y. Shimizu, Izumi Hirasawa

    Research output: Contribution to journalArticle

    7 Citations (Scopus)


    Reactive crystallization for separation and recovery of divalent metal ions from wastewater using a semi-batch crystallizer has been developed. In this process, metal carbonates are produced by reacting metal sulfate solution with sodium carbonate solution. Nickel and copper ions are crystallized under particular initial pH conditions but the product shapes are not regular. Consequently, sphere seeds have been used as nucleus-generating agents and their growth mechanism has been examined. When providing a particular amount of seeds before crystallization, metal substances piled up on the surface of the seeds, maintaining the form sphere, and the production of fines was restricted. The metal removal rate through reactive crystallization was ∼99.9% on average. This operation proved to be suitable for application in industrial wastewater treatment and for recycling of metal materials.

    Original languageEnglish
    Pages (from-to)1588-1592
    Number of pages5
    JournalChemical Engineering and Technology
    Issue number9
    Publication statusPublished - 2012 Sep



    • Crystallization
    • Metal ion recovery
    • Sphere seeds
    • Wastewater treatment

    ASJC Scopus subject areas

    • Chemical Engineering(all)
    • Chemistry(all)
    • Industrial and Manufacturing Engineering

    Cite this