Ferronickel slag produced in New Caledonia: characterisation and carbonation in seawater Online publication date: Thu, 14-Jul-2022
by Jordan Prévot; Arnaud Serres; Peggy Gunkel-Grillon; René Sabot; Marc Jeannin
International Journal of Mining and Mineral Engineering (IJMME), Vol. 13, No. 1, 2022
Abstract: Ferronickel slags (FNS) have been studied for a potential use of this industrial waste in seawater through mineral carbonation. Leaching tests have been performed using seawater and EDTA, a strong chelating agent. In both cases, only small concentrations (in the range of µg/g) of released heavy metals are measured by inductively coupled plasma, demonstrating the non-hazardousness of FNS. The carbonation process of FNS was then observed by immersing them in artificial and natural seawater tanks for respectively four and seven months. FNS surface and cross-section samples have then been observed by scanning electron microscopy and chemical analysis. After seven months, a 5 cm thick sturdy conglomerate, composed of FNS stuck by a 25 µm thick calcium carbonate layer, is obtained. A mechanism of this natural carbonation process is proposed in the light of CO2 sequestration.
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