PRESSURE OXIDATION OF A COPPER-RICH PYRITIC GOLD CONCENTRATE

Year 2021, Volume: 60 Issue: 4, 197 - 207, 21.12.2021

Saleban Mohamed Muse , Ersin Yener Yazıcı , Oktay Celep , Hacı Deveci

https://doi.org/10.30797/madencilik.932319

Abstract

In this study, the pressure oxidation of a refractory copper-rich (0.3% Cu) pyritic gold concentrate (62 g/t Au, 110 g/t Ag, %19,3 pyritic S2-) prior to cyanide leaching was investigated. The effect of parameters i.e., temperature (180-220 °C), oxygen pressure (pO2=5-10 bar), retention time (0.5-2 h) and acid concentration (20-50 g/L H2SO4) was examined on the removal of copper, pyritic sulphur oxidation and extraction of gold in the subsequent cyanide leaching. The increased levels of the parameters improved the gold extraction. The highest gold extraction (97.4%) in cyanide leaching was achieved by the pre-treatment of the concentrate i.e., acid washing (50 g/L H2SO4) followed by pressure oxidation under the conditions of 50 g/L H2SO4, 220 °C, 10 bar and 1 h. The findings demonstrated that high gold recoveries in cyanide leaching can be achieved after pressure oxidation of the concentrate.

Keywords

Gold, Copper, Pyrite, Pressure oxidation, Cyanide leaching

BAKIR İÇERİĞİ YÜKSEK PİRİTİK BİR ALTIN KONSANTRESİNİN BASINÇ OKSİDASYONU

Abstract

Bu çalışmada, refrakter özellikte bakır içeriği yüksek (%0,3 Cu) bir piritik altın konsantresinin (62 g/t Au, 110 g/t Ag, %19,3 piritik S2-) siyanür liçi öncesi basınç oksidasyonu araştırılmıştır. Sıcaklık (180-220 °C), oksijen basıncı (pO2=5-10 bar), süre (0,5-2 saat) ve asit konsantrasyonu (20-50 g/L H2SO4) parametrelerinin bakırın uzaklaştırılması, piritin oksidasyonu ve takip eden siyanür liçinde altın kazanımına etkileri incelenmiştir. Bu parametrelerin seviyeleri arttıkça altın kazanımları yükselmiştir. Siyanür liçinde en yüksek altın kazanımına (%97,4) ön asit yıkama (50 g/L H2SO4) sonrası 50 g/L H2SO4, 220 °C, 10 bar ve 1 saat koşullarında gerçekleştirilen basınç oksidasyonu işlemi ile ulaşılmıştır. Elde edilen sonuçlar, refrakter altın konsantresinin basınç oksidasyonu sonrasında siyanür liçinde yüksek altın kazanımlarına ulaşılabileceğini göstermiştir.

Keywords

Altın, Bakır, Pirit, Basınç oksidasyonu, Siyanür liçi

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