Aşırı öğütülmüş kalkopirit konsantresinden bakırın nitrik asit ve dikromat ortamında seçimli kazanımı

Year 2024, Volume: 15 Issue: 3, 653 - 661, 30.09.2024

Zeynel Abidin Sarı , M. Deniz Turan

https://doi.org/10.24012/dumf.1494580

Abstract

Kalkopiritin liçi, kompakt altıgen kristal yapısından dolayı çoğunlukla zordur. Kalkopiritten metal ekstraksiyonunu geliştirmenin yöntemlerinden biri de aşırı öğütmeyle mekanik aktivasyon işleminin uygulanmasıdır. Bu çalışmada, aşırı öğütmeye tabii tutulmuş kalkopirit konsantresinin nitrik asit (HNO3) ve potasyum dikromat (K2Cr2O7) varlığında selektif liç işlemi incelenmiştir. Bunun için öncelikle kalkopirit konsantresi paslanmaz çelik hazne ve bilyelere sahip speks tipi bir öğütücüde belirli sürelerde öğütme işlemine tabii tutulmuştur. Daha sonra elde edilen ürün, sıcaklığı ayarlanabilen küvet düzenekli çoklu bir manyetik karıştırıcı vasıtasıyla liç işlemi gerçekleştirilmiştir. Elde edilen sonuçlara göre artan liç sıcaklığı ve liç süresi ile birlikte bakır kazanımının arttığı diğer taraftan selektifliği azaltan demirin ise sınırlı oranda çözündüğü belirlenmiştir. Optimum şartlar olarak 25 dk speks öğütme süresi, 1,5 M HNO3 konsantrasyonu, 0,3 M K2Cr2O7 konsantrasyonu, 65 ℃ liç sıcaklığı, 120 dk liç süresi, 25 mL/g sıvı-katı oranı ve 400 rpm karıştırma hızında Cu ve Fe ekstraksiyon verimleri sırasıyla %98,6 ve %1,6 olarak belirlenmiştir. Diğer taraftan öğütmesiz koşullarda yapılan özdeş şartlardaki liç deneylerinde ise bakır ekstraksiyonunun %50 civarında olduğu hesaplanmıştır. Ayrıca optimum şartlardaki deneylerde seçimliliği azaltan demirin liç artığında K-Cr-jarosit olarak kaldığı tespit edilmiştir. Bunun yanı sıra demirin jarosit olarak çökmesinde ortam sıcaklığı ve çözelti pH değerinin oldukça etkin olduğu saptanmıştır.

Keywords

Kalkopirit konsantresi, Seçimli liç, Potasyum dikromat, Bakır, Aşırı öğütme

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