Hirtopanu and Udubasai reported in 2014 the southeastern part of Romania, near Galaţi, there is the largest slag waste dump in the country as a result of the metallurgics plant (now ArcelorMittal Galați) activity during the last decades. In order to asses the eventually re-use of the waste dump material, a detailed mineralogical study was carried out. Some 100 slag samples have been investigated and revealed a quite uniform composition. Their mineralgy is quite complex, from the point of view of mineral classes and comprises native elements, oxides, sulfides, phosphates and silicates.
The main component is melilite, twinned and zoned, having with fine inclusions of native iron and oldhamite. Fayalite is rather frequent and zoned. Wüstite inclusions occur within the anorthite glass. Skeletal grains of merwinite have been observed, as well as perovskite associated with melilite. Hercynite and whitlockite occur as accessory components. The potential use of the slag material could be as construction material, but also as a potential source of some rare elements.
Keywords: slag, melilite, fayalite, calcium disilicate, native iron, wüstite, magnetite, troilite, oldhamite.
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