Valorization of the steel industry slag and by-products as raw material asset for innovative refractories

Marjaana Karhu, Patrycja Piotrowska, Bob Talling, Jasmin Hum, Aldo R. Boccaccini, Pertti Lintunen

    Research output: Contribution to conferenceConference AbstractScientific

    Abstract

    The European steel industry generated in 2012 about 21.4 million tons of slag of which about 24% was landfilled. Landfilling of the huge amount of materials poses a severe environmental problem in Europe. Utilization of currently landfilled waste is a target of growing interest towards circular economy and closing the loop. Insulating refractory materials are needed in all thermal energy intensive industries for example in the construction of the furnaces, kilns, incinerators, or reactors. The relevant properties of certain slags and industrial by-products to withstand high temperatures make them possible raw material candidates when manufacturing novel refractory materials. In the presented study, exploitation potentiality of ferrochrome slag and other by-product as raw material asset for refractory materials has been studied. The goal was to maximize the use of secondary raw materials in refractory materials with mechanical and chemical resistance up to 1200°C in gaseous atmosphere. Recipes were formulated based on raw material characterization results and theoretical calculations including optimal particle packing calculations. Mortar pieces were prepared according to standard EN 196-1. Mechanical properties of the refractory specimens were evaluated based on their cold crushing strength. In addition, specimens were characterized in terms of physical and thermo-physical properties: density, porosity, thermal conductivity, thermal diffusivity and heat capacity and compared to commercially available refractory material. The cold compressive strengths reaching the values of 70-90 MPa were observed for the mortars heat-treated at 1200°C being comparable level to commercial reference. Thermal conductivity values of the mortars were at the level of 1.8-2.2 W/K m, which indicates good heat insulating capability showing values
    even below that of reference material.
    Original languageEnglish
    Publication statusPublished - 2018
    MoE publication typeNot Eligible
    Event10th International Conference on the Environmental and Technical Implications of Construction with Alternative Materials
    WASCON 2018
    - Tampere Hall, Tampere, Finland
    Duration: 6 Jun 20178 Jun 2017
    Conference number: 10
    https://www.ril.fi/en/events/wascon-2018.html

    Conference

    Conference10th International Conference on the Environmental and Technical Implications of Construction with Alternative Materials
    WASCON 2018
    Abbreviated titleWASCON 2018
    CountryFinland
    CityTampere
    Period6/06/178/06/17
    Internet address

    Keywords

    • Slag valorization, Refractories, Ferrochrome slag

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  • Cite this

    Karhu, M., Piotrowska, P., Talling, B., Hum, J., Boccaccini, A. R., & Lintunen, P. (2018). Valorization of the steel industry slag and by-products as raw material asset for innovative refractories. Abstract from 10th International Conference on the Environmental and Technical Implications of Construction with Alternative Materials
    WASCON 2018, Tampere, Finland.