LİÇ ATIKLARINDAN SİYANÜRÜN GERİ KAZANIMI YÖNTEMLERİ

Year 2019, Volume: 58 Issue: 1, 53 - 71, 01.03.2019

Elif Yılmaz , Ersin Y. Yazıcı , Oktay Celep Hacı Deveci

https://doi.org/10.30797/madencilik.537646

Cited By: 1

Abstract

liçidir. Cevherde bulunan bakır, çinko vb. minerallerinin de siyanür liçinde çözünmesi siyanür

tüketimini artırmakta ve altın kazanımını olumsuz yönde etkilemektedir. Çözünen bu metaller, liç

sonrası çözelti saflaştırma ve metal kazanımı süreçlerinde de teknik sorunlara neden olmaktadır.

Siyanür liçi sonucunda, serbest siyanür ve metal-siyanür komplekslerini içeren atık çözelti (palp)

açığa çıkmaktadır. Bu atıklar, kimyasal bozundurma (INCO SO2/Hava, H2O2 gibi) veya siyanür

geri kazanım proseslerine tabi tutularak siyanür içeriklerinin yasal olarak belirlenen sınırların

(CN WAD<10 mg/L) altına indirilmesi gerekmektedir. Siyanürün geri kazanımı ile siyanür derişiminin

gerekli seviyeye indirilmesinin yanı sıra reaktif maliyetleri de azaltılabilir. Bu amaçla, aktif karbon

adsorpsiyonu, iyon değişimi (IX), solvent ekstraksiyonu (SX), elektro-kazanım, asitleştirmeabsorpsiyon

temelli prosesler (AVR, Cyanisorb) ve SART gibi farklı siyanür geri kazanım yöntemleri

geliştirilmiştir. Endüstriyel siyanür geri kazanım teknikleri (AVR, SART vd.) ile siyanür tüketimi

%50-75 azaltılabilmektedir. Fakat bu proseslerin tesiste uygulanması sırasında çeşitli problemlerle

karşılaşılmaktadır. Bu nedenle, yeni ve daha etkin yöntemlerin geliştirilmesine ihtiyaç duyulmaktadır.

Bu çalışmada, siyanür geri kazanımı için geliştirilen bu yöntemlerin/proseslerin teknik özellikleri,

birbirine göre olumlu ve olumsuz yanları detaylı olarak tartışılmıştır.

Keywords

Altın cevherleri, Liç, Siyanür, Bakır, Geri kazanım, AVR

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