GOSSAN YAPILI CEVHERLERDE Au/Ag KAZANIMI ÜZERİNE SİYANÜRLEME PARAMETRELERİNİN ETKİSİ

Bu çalışma da, Niğde Ulukışla Gossan yapılı altın gümüş cevherlerine, alkali ortamda siyanür parametresinin etkinliği incelenmiştir. Cevherin mineral yapısında; demir cevherleri (limonit-götit-lepidokrosit), çinko mineralleri (smitsonit-hidrozinkit-hemimorfit), kurşun mineralleri (serüzit-plumbojarosit) ve gang mineralleri (kil-kuvars-kalsit) bulunmaktadır. Tüm bu minerallerin yanı sıra cevherdeki farklı jarosit formları da Gossan cevheri yapısı ile uyumludur. Cevher mikroskobisi ile altının limotit-götit-lepidokrosit mineralleri ile beraber bulunduğu belirlenmiştir. Direk siyanürleme testlerinde altın ve gümüş düşük verimlerle kazanılmıştır. Bu amaçla, siyanürleme öncesinde sıcak alkali kireç ön işlemi ve ardından da siyanür araştırmaları gerçekleştirilmiştir. Siyanür miktarı tayini 24 saat ve 60°C sıcaklıkta, 0,125-4 g/L NaCN konsantrasyonları arasında, siyanür süre araştırmaları ise, 1,5 g/L NaCN konsantrasyonunda, 60 °C sıcaklıkta, 1-84 saat arasındaki sürelerde gerçekleştirilmiştir. Sonuçta, altının % 64-97 arasına, gümüşün de % 55-76 arasına kadar arttığı belirlenmiştir.

Anahtar Kelimeler:

Gossan, altın/gümüş, jarosit, kireç, siyanür prosesi

THE IMPACT OF THE CYANIDATION PARAMETERS ON Au/Ag RECOVERY IN GOSSAN STRUCTURED ORES

In this study, the activity of cyanide parameter in alkali media was investigated in gold-silver ores of Niğde-Ulukışla-Gossan. Mineral structures of the ore are; iron ore (limonite-goethite-lepidocrocite), zinc minerals (smitsonite-hydrozincite-hemimorphite), lead minerals (cerrussite-plumbojarosite), and gangue minerals (clay-quartz-calcite) are present. In addition to all these minerals, different jarosite forms in the ore are also compatible with Gossan ore structure. It has been determined with the ore microscope that gold together with limonite-goethite-lepidocrocite minerals. In the direct cyanide tests, gold and silver were gained with low yields. For this purpose, hot alkali lime pre-treatment followed by cyanide investigations was carried out before cyanidation. The amount of cyanide was determined at 24-hours and 60°C temperature, between 0.125-4g/L NaCN concentrations, while cyanide time studies were carried out at a concentration of 1.5g/L NaCN at 60°C for 1-84hours. As a result, it has been determined that between 64-97% Au and 55-76% Ag are increased.

Keywords:

Gossan, Gold/Silver, Jarosite, Lime, Cyanide process,

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