Effect of Different Crucible Usage on Copper Losses to Slag

Öz

Copper losses to the slag in the smelting stage are one of the major problems in copper production factories. In this study, flash furnace slag and flash furnace matte provided by Eti Copper Co. (EBI) were melted at 1250oC for 2 hours under the nitrogen atmosphere in alumina crucibles with different proportions (0%, 2%, 4% and 6%) of colemanite (2CaO·3B2O3·5H2O) addition. The amount of the copper losses to slag in alumina crucibles was observed and also compared with the values obtained from the same experimental conditions by using silica crucible. In addition, liquidus temperature and viscosity of the resultant slags were calculated and the first precipitates were revealed by using FactSage model program. According to the results, the level of copper losses to the slag was significantly reduced by the addition of colemanite for both types of the crucible.

Anahtar Kelimeler

• Copper loss,Slag,Alumina crucible,Silica crucible,FactSage

Cürufa Olan Bakır Kayıplarında Farklı Kroze Kullanımının Etkisi

Öz

Bakır işletmelerinde ergitme aşamasında cürufa olan bakır kayıpları sektördeki önemli problemlerden biridir. Bu çalışmada, Eti Bakır İşletmelerinden (EBİ) temin edilen flaş fırın cürufu ve flaş fırın matı eşit miktarlarda alınarak farklı oranlarda kolemanit (2CaO·3B2O3·5H2O) ilavesi (%0, %2, %4 ve %6) ile karıştırılıp alumina (Al2O3) krozelerde 1250oC’de ve azot atmosferi altında 2 saat boyunca ergitme deneylerine tabi tutulmuştur. Böylece, alümina kroze (AK) kullanılan deneylerde cürufa olan bakır kaybı oranları gözlemlenmiş ve aynı deneysel koşullarda silika kroze (SK) kullanılarak yapılmış deneylerden elde edilen değerler ile karşılaştırılmıştır. Ayrıca, FactSage programı yardımıyla deneyler sonucunda oluşan cüruflara ait viskozite ile sıvılaşma sıcaklığı değerleri hesaplanmış ve ilk katılaşan faz ortaya çıkarılmıştır. Deneysel bulgular kolemanit ilavesinin flaş fırın cürufuna kaybedilen bakır miktarının her iki tip kroze kullanılması durumda da önemli oranda azaltılabildiğini göstermiştir.

Anahtar Kelimeler

• Bakır kaybı,Cüruf,Alumina kroze,Silika kroze,FactSage

Kaynakça

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