BAKIR İÇERİĞİ YÜKSEK REFRAKTER BİR ALTIN CEVHERİNİN SİYANÜR LİÇİNE UYGUNLUĞUNUN ARAŞTIRILMASI

Serbest altın içeren cevherlerin giderek tükenmesi nedeniyle refrakter altın cevherlerinden altınüretimi artmaktadır. Siyanür tüketen minerallerin (bakır mineralleri gibi) varlığı ve altının pirit vearsenopirit gibi mineraller içerisinde kapanım halinde bulunması altın cevherlerindeki refrakterliğinyaygın nedenleri arasında yer almaktadır. Bu çalışmada, bakırca zengin bir altın cevherinin(108 g/t Au, %1,60 Cu) siyanür liçine uygunluğu araştırılmıştır. Siyanür liçinde elde edilen düşük(%18,4) altın kazanımı, cevherin yüksek derecede refrakter bir cevher olduğunu göstermektedir.Sülfürik asit ön işlemi ile asitte çözünen bakırın uzaklaştırılması, takip eden siyanür liçindeyüksek altın kazanımlarına ulaşılmasında etkili olmamıştır. Yüksek NaCN konsantrasyonlarında(1-8 g/L) yapılan testlerde, sınırlı altın kazanımları (≤%47,2) elde edilmiştir. Siyanür liçinden önceön işlem olarak uygulanan çok ince öğütme (d80: 8-73 μm) sonrası altın kazanımları %54,1’inaltında kalmıştır. Elde edilen sonuçlar cevherin çift yönlü refrakter bir cevher olduğunu ve siyanürliçi aşamasında kabul edilebilir (>%90) altın kazanımlarına ulaşmak için daha etkili ön işlem(ler)inuygulanmasının gerekli olduğunu göstermiştir.

INVESTIGATION OF THE AMENABILITY OF A COPPER-RICH REFRACTORY GOLD ORE TO CYANIDE LEACHING

The production of gold from refractory gold ores has been increasing due to the exhaustion of free milling gold ores. The presence of cyanicides (e.g., copper minerals) and encapsulation of gold in minerals such as pyrite and arsenopyrite are common reasons for refractoriness of gold ores. In this study, the amenability of a copper-rich gold ore (108 g/t Au, 1.60% Cu) to cyanide leaching was investigated. Direct cyanide leaching of the ore showed that the gold extraction was very low by 18.4% over 24 h., indicating that the ore is highly refractory. Sulphuric acid pretreatment for the removal of acid-soluble copper was found to be not effective to achieve high gold extractions at the subsequent cyanide leaching. Leaching at high NaCN concentrations (1-8 g/L) yielded limited Au extractions of ≤47.2%. Ultra-fine grinding (UFG) (d80: 8-73 μm) as a pretreatment route followed by cyanide leaching also could provide Au recoveries of just below 54.1%. The findings showed that the ore is double-refractory and needs the employment of more effective pretreatment process(es) to achieve acceptable gold extractions (>90%) in subsequent cyanidation stage.

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