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  • Küçük Resim Yok
    Öğe
    Investigation of the cyanide leaching optimization for ultrafine grinding gold-silver ore
    (TAYLOR & FRANCIS INC, 2016) Birol, Onur; Ucurum, Metin
    In recent years, the ultrafine grinding (UFG) process has become increasingly important for the recovery of precious metals (especially for Au and Ag) from raw ores. It is well known that cyanide leaching of gold-silver ore has been an accepted process in the world. In the current study, UFG was proposed as a pretreatment method prior to cyanide leaching of a gold-silver ore. First, the ore was crushed and ground by jaw, cone crusher, and ring mill, respectively. Particle size of ground product was 75 mu m based d(80). Second, the fine product was subjected to the grinding process by vertical wet stirred ball mill, and the final ultrafine product was used as leach feed material. The leach feed material had about d(80)=20 mu m and d(50)=6.02 mu m particle size. Some important leaching parameters were optimized by using the ultrafine powder in the study. The final leach experiments demonstrated that the recoveries of Au and Ag were 91.92% and 82.15% under optimum leaching conditions such as 150kg/t quicklime dosage, 25% pulp density, 85 degrees C leach temperature, 500g/t cyanide concentration, and 90h leaching time.
  • Küçük Resim
    Öğe
    Mekanik aktivasyon esaslı öğütmenin altın zenginleştirme verimine etkisinin araştırılması
    (Niğde Üniversitesi / Fen Bilimleri Enstitüsü, 2015) Birol, Onur; Uçurum, Metin
    This thesis includes the study about gold ore obtained from Bolkardag (Ulukışla, Niğde) underground mine. Firstly, XRF, XRD and Thin-Section studies were performed on representative sample. Then, the ore was crushed and ground by jaw, cone crushers and ring mill, respectively. Particle size of the product was 75 µm based d80. Again, the product was subjected to grinding process by vertical wet stirred ball mill and final ground product was used as leach feed material. The leach feed material has about d80= 20 µm and d50=6.02 µm particle size. Leaching study was performed by using quicklime quantity, solid ratio, temperature, cyanide concentration and leaching time parameters. The final experiments show that the recovery of Au and Ag was 91.92% and 82.15% under optimum leach conditions.