Production of Ferronickel from Mill-scale via Metallothermic Process

Öz

In this study, the production of ferronickel (Fe-Ni), which is an iron-based alloy, was carried out by aluminothermic methods. Mill scale obtained from continuous casting process was used as starting material. Mill scale is oxidized layers of steel alloys containing iron oxide with +2 and +3 values, it is formed on the surface of slabs and billets during annealing process at integrated iron and steel plants. In the metallothermic experiments, effect of aluminium (Al) powder addition to various ratios of starting oxide powders (mill scale (Fe, Fe2O3, FeO, Fe3O4), NiO) on metal recovery and alloy compositions were investigated. Before the experiments, reduction conditions were simulated via FactSage 6.4 database and convenient stoichiometric ratios were determined. Samples were characterized by chemical analysis (AAS), XRD, XRF and optical microscopy techniques. Highest metal recovery was obtained as 81.24% by using 110% stoichiometric Al containing mixture.

Anahtar Kelimeler

• Mill Scale,ferroalloys,ferronickel,metallothermic reduction

Sürekli Döküm Tufalinden Metalotermik Yöntemle Ferronikel Üretimi

Öz

Bu çalışmada, sürekli döküm işlemlerinden elde edilen tufalden başlayarak ve alüminotermik yöntem kullanarak bir demir bazlı alaşım olan ferronikelin üretimi gerçekleştirilmiştir. Tufaller entegre demir-çelik üretim tesislerinde tavlama işlemi sırasında kütüklerin yüzeyinde oluşan ve +2 ile +3 değerlikli demir oksit içeren oksitlenmiş çelik tabakalarıdır. Metalotermik deneylerde, farklı başlangıç karışım oranlarındaki oksit tozlarına (Tufal (Fe, FeO, Fe203, Fe304), NiO) alüminyum (Al) tozunun ilavesinin metal geri kazanım verimleri ve sonuç ürün alaşım bileşimleri üzerindeki etkileri incelenmiştir. Deneylerden önce indirgeme koşulları FactSage 6.4 veri tabanı üzerinden modellenerek uygun stokiyometrik bileşimler belirlenmiştir. Deneysel çalışmalar neticesinde elde edilen örnekler kimyasal analiz (AAS), XRD, XRF ve optik mikroskopi teknikleri kullanılarak karakterize edilmiştir. Deneyler sonucunda en yüksek metal kazanım verimi %110 stokiyometrik bileşimde Al kullanılan deneyde elde edilmiş ve bu değer %81.24 olmuştur.

Anahtar Kelimeler

• Tufal,ferroalaşımlar,ferronikel,metalotermik redüksiyon

Kaynakça

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