Effect of Different Crucible Usage on Copper Losses to Slag

Yıl 2017, Cilt: 32 Sayı: 2, 125 - 136, 15.06.2017

Aydın Rüşen

https://doi.org/10.21605/cukurovaummfd.358395

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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