Effect of Na2S+NaOH pre-identification leaching on oxidized refractory Au-Ag ores

Emine Yoğurtcuoğlu; İbrahim Alp

Makale detayları

Effect of Na2S+NaOH pre-identification leaching on oxidized refractory Au-Ag ores

Yazarlar:

Emine Yoğurtcuoğlu | İbrahim Alp

Yayıncı:

Nigde Omer Halisdemir University

Ana Başlıklar:

Kimyasal-Biyolojik Kazanma Teknikleri ve Cevher Hazırlama

Dergi:

Niğde Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi Vol.13 Issue 2, pp.440-447

Belge Tipi:

Makale

Yayın Tarihi:

4/2024

Belge Dili:

İngilizce

Document ID (Org No.):

2001315334

pISSN:

2564-6605

Anahtar kelimeler:

Özet:

 This study was conducted to investigate the effect of the alkaline sulfide Na2SNaOH pre-identification process on cyanide leaching performance in oxidized refractory gold-silver ores. The ore has intensive oxide, carbonate, and silicate content, and contains AuAg minerals containing electrum, acanthite, and silver-bearing FePbZn Sulphate-ArsenateHydroxide minerals together with Fe, Pb, and Zn minerals. Niğde Ulukışla refractory AuAg ore has 8-9 gT gold and 170-180 gT silver grades. In mineralogical examinations, it was found that these metals were closed in minerals such as iron oxyoxyhydroxide, calcite, and quartz or neighboring these minerals. In the cyanide soluble process after alkali sulfide preliminary procedure at room temperature, metal extraction yields were obtained as 62 for gold and 7 for silver. It is seen that silver is adversely affected by this process compared to the direct cyanidation process. However, after the hot alkali treatment process, metal extractions improved by approximately 25 of gold and 74 of silver. This increase in yield can be considered as converting Ag-oxyhydroxide into soluble Ag forms as a result of the effect of hot alkaline sulfur leaching on the cyanide process. The most important advantage of this decomposition process is to achieve high metal extraction efficiency in lower alkali concentrations.

 This study was conducted to investigate the effect of the alkaline sulfide Na2SNaOH pre-identification process on cyanide leaching performance in oxidized refractory gold-silver ores. The ore has intensive oxide, carbonate, and silicate content, and contains AuAg minerals containing electrum, acanthite, and silver-bearing FePbZn Sulphate-ArsenateHydroxide minerals together with Fe, Pb, and Zn minerals. Niğde Ulukışla refractory AuAg ore has 8-9 gT gold and 170-180 gT silver grades. In mineralogical examinations, it was found that these metals were closed in minerals such as iron oxyoxyhydroxide, calcite, and quartz or neighboring these minerals. In the cyanide soluble process after alkali sulfide preliminary procedure at room temperature, metal extraction yields were obtained as 62 for gold and 7 for silver. It is seen that silver is adversely affected by this process compared to the direct cyanidation process. However, after the hot alkali treatment process, metal extractions improved by approximately 25 of gold and 74 of silver. This increase in yield can be considered as converting Ag-oxyhydroxide into soluble Ag forms as a result of the effect of hot alkaline sulfur leaching on the cyanide process. The most important advantage of this decomposition process is to achieve high metal extraction efficiency in lower alkali concentrations.

 This study was conducted to investigate the effect of the alkaline sulfide Na2SNaOH pre-identification process on cyanide leaching performance in oxidized refractory gold-silver ores. The ore has intensive oxide, carbonate, and silicate content, and contains AuAg minerals containing electrum, acanthite, and silver-bearing FePbZn Sulphate-ArsenateHydroxide minerals together with Fe, Pb, and Zn minerals. Niğde Ulukışla refractory AuAg ore has 8-9 gT gold and 170-180 gT silver grades. In mineralogical examinations, it was found that these metals were closed in minerals such as iron oxyoxyhydroxide, calcite, and quartz or neighboring these minerals. In the cyanide soluble process after alkali sulfide preliminary procedure at room temperature, metal extraction yields were obtained as 62 for gold and 7 for silver. It is seen that silver is adversely affected by this process compared to the direct cyanidation process. However, after the hot alkali treatment process, metal extractions improved by approximately 25 of gold and 74 of silver. This increase in yield can be considered as converting Ag-oxyhydroxide into soluble Ag forms as a result of the effect of hot alkaline sulfur leaching on the cyanide process. The most important advantage of this decomposition process is to achieve high metal extraction efficiency in lower alkali concentrations.

 Bu çalışma, oksitli refrakter altın-gümüş cevherlerinde alkali sülfür ön tanımlama işleminin siyanür liç performansına etkisini araştırmak amacıyla yapılmıştır. Yoğun oksit, karbonat ve silikat içeriğine sahip olan cevherde Fe, Pb ve Zn minerallerinin yanı sıra elektrum, akantit ve gümüş içeren FePbZn Sülfat-ArsenatHidroksit minerallerini içeren AuAg mineralleri de bulunmaktadır. Niğde Ulukışla refrakter AuAg cevheri 8-9gt altın ve 170-180gt gümüş tenörlerine sahiptir. Mineralojik incelemelerde, bu metallerin demir oksioksi hidroksit, kalsit, kuvars gibi minerallerin içerisinde kapanım halinde bulunduğu ya da bu minerallerle komşu olduğu tespit edilmiştir. Oda sıcaklığında gerçekleştirilen alkali sülfür ön işlemi sonrası siyanür çözündürme prosesinde metal kazanım verimleri altın için 62 ve gümüş için 7 olarak elde edilmiştir. Direkt siyanürleme işlemi ile kıyaslandığında gümüşün bu işlemden olumsuz etkilendiği görülmektedir. Bununla beraber, sıcak alkali işlem prosesinden sonra, metal ekstraksiyonlarında yaklaşık olarak 25 oranında altında ve 74 oranında gümüşte iyileşme meydana gelmiştir. Bu verim artışı sıcak alkali sülfür liçinin siyanür prosesine etkisi sonucu Ag-Oksihidroksitleri çözünebilir Ag formlarına dönüştürmesi şeklinde değerlendirilebilir. Bu bozundurma prosesinin en önemli avantajı ise daha düşük alkali konsantrasyonunda yüksek metal kazanım verimlerinin ulaşılabilmesidir.

Makale detayları

Effect of Na2S+NaOH pre-identification leaching on oxidized refractory Au-Ag ores

Yazarlar:

Emine Yoğurtcuoğlu | İbrahim Alp

Yayıncı:

Nigde Omer Halisdemir University

Ana Başlıklar:

Kimyasal-Biyolojik Kazanma Teknikleri ve Cevher Hazırlama

Dergi:

Niğde Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi Vol.13 Issue 2, pp.440-447

Belge Tipi:

Makale

Yayın Tarihi:

4/2024

Belge Dili:

İngilizce

Document ID (Org No.):

2001315334

pISSN:

2564-6605

Na2S

NaOH

Gold

Silver

Refractory oreNa2S

NaOH

Altın

Gümüş

Refrakter cevher

Sayı

Makale detayları

Yazarlar: Emine Yoğurtcuoğlu | İbrahim Alp

Yayıncı: Nigde Omer Halisdemir University

Ana Başlıklar: Kimyasal-Biyolojik Kazanma Teknikleri ve Cevher Hazırlama

Dergi: Niğde Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi Vol.13 Issue 2, pp.440-447

Belge Tipi: Makale

Yayın Tarihi: 4/2024

Belge Dili: İngilizce

Document ID (Org No.): 2001315334

pISSN: 2564-6605

Sayı

Yazarlar:

Emine Yoğurtcuoğlu | İbrahim Alp

Yayıncı:

Nigde Omer Halisdemir University

Ana Başlıklar:

Kimyasal-Biyolojik Kazanma Teknikleri ve Cevher Hazırlama

Dergi:

Niğde Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi Vol.13 Issue 2, pp.440-447

Belge Tipi:

Makale

Yayın Tarihi:

4/2024

Belge Dili:

İngilizce

Document ID (Org No.):

2001315334

pISSN:

2564-6605