Journals / İTÜ Dergisi Seri D: Mühendislik / 2003 / Cilt: 2 - Sayı: 3
Extraction of metallic values from Küre massive rich copper ore by pressure leaching
- Pages
- 62–72
- DOI
- —
Abstract
Several hydrornetallurgical treatments such as chloride, sulfate, nitrate, and amine based processes are used for leaching of chalcopyrite, sphalerite, and galena concentrates as alternative to pyrometallurgical processes. Sulfate-based hydrometallurgical processes are usually employed as ferric sulfate leaching, oxygen pressure leaching, or bacterial leaching. The aim of this study was to investigate the possibilities of recovering metallic values from Küre massive rich copper ore by pressure leaching. Massive rich copper ore, taken from Küre and containing 7.43 % Cu, 0.044 % Pb, 0.33 % Zn, 0.08 % Co, 0.002 % Ni, l (g/t) Au, 14 (g/t) Ag, was subjected to this experimental study. In the leaching tests, the effects of leaching time, temperature, partial oxygen pressure, solids concentration, initial acid concentration, and silver ion addition as a catalyst on metal leaching recoveries were investigated and optimum leaching conditions were determined. The optimum leaching conditions were found as 160 $circ$C temperature, 0.4 M initial $H_{2}SO_{4}$ concentration, 20 bar partial oxygen pressure, 50 g/l solids concentration, and 120 min leaching time. Approximately 95% of copper, 70% of cobalt and 97% of zinc were extracted under these conditions. It was also shown that silver ions could be added in small quantities for enhancing the leach process. Copper leaching kinetics was also studied and an activation energy for copper dissolution reaction was found as 52, 74 kJ/mol which shows diffusion controlled process.
Özet
Bu çalışmada, Küre masif zengin bakır cevherinin basınç altında liçi çalışılmıştır. Deneylerde süre, sıcaklık, oksijen kısmi basıncı, katı konsantrasyonu, asit konsantrasyonu ve katalizör olarak gümüş iyonları ilavesinin metal çözünme verimleri üzerindeki etkileri araştırılmıştır. Optimum çözündürme koşulları 160 $circ$Csıcaklık, 0.4 M başlangıç $H_{2}SO_{4}$ konsantrasyonu, 20 bar oksijen kismi basıncı, 50 g/l katı konsantrasyonu ve 120 dak. liç süresi olarak belirlenmiştir. Bu koşullarda bakır %95, kobalt %70 ve çinko %97 verimle çözeltiye alınabilmiştir. Ortama az miktarda gümüş iyonları ilavesinin liç prosesini hızlandırıcı etkisi olduğu belirlenmiştir^ Bakır çözünme kinetiği incelenmiş ve çözünme reaksiyonunun aktivasyon enerjisi 52,74 kJ/mol olarak bulunmuştur. Bu değer reaksiyonun difüzyon kontrollü olduğunu göstermektedir.