Recovery of Lead and Zinc Heavy Metals from Leach Solution by Chemical and Biological Methods

Year 2023, , 33 - 41, 25.04.2023

Ceyda Üge , Aytül Bayraktar , Melda Başbuğ Çancı , Emine Sayılgan

https://doi.org/10.19113/sdufenbed.1107771

Abstract

Within the scope of this study, a waste sludge obtained from a Lead-ZincCopper Flotation Enrichment Facility in Turkey. Mining waste contains high concentrations of Zn and Pb elements, therefore it is aimed to recover these elements with an environmentally friendly method. For this purpose, the recovery of Pb and Zn heavy metals was investigated by chemical and biological methods after leaching with 2 M HNO3. As a result of the leaching studies, it has been determined that Pb and Zn heavy metals can be taken into solution effectively with 2 M HNO3 at 40°C, at the end of the 4 hours test period. Under the specified leaching conditions, approximately 73% Pb and 37% Zn could be leached into solution. For biological recovery experiments, the effects at 3 different levels of 4 different variables (MC concentration, pH, reaction time and temperature), which were created according to 24 factorial designs were investigated. The results showed that it was possible to
recover 79-100% of all elements at high pH values. For chemical recovery studies, the effect of different pH values on removal with 8M NaOH was investigated and recovery of 95% Pb and 94% Zn was obtained after precipitation.

Keywords

Lead, Microbial Cellulose, Mine Waste, Precipitation, Recovery, Zinc

Liç Solüsyonundan Kimyasal ve Biyolojik Yöntemlerle Kurşun ve Çinko Ağır Metallerinin Geri Kazanımı

Abstract

Bu çalışmada, Kurşun-Çinko- Bakır Flotasyon Zenginleştirme tesisinden temin edilen atık çamurda yüksek konsantrasyonda tespit edilen Zn ve Pb elementlerinin geri kazanımı hedeflenmiştir. Bu amaçla atık maden çamuru 2 M HNO3 ile liç edildikten sonra, kimyasal ve biyolojik yöntemlerle Pb ve Zn ağır metallerinin geri kazanımı araştırılmıştır. Liç çalışmaları sonucunda 2 M HNO3 ile 40 °C’de, 4 saat deney süresi sonunda Pb (%73 ) ve Zn (%37 ) ağır metallerinin etkili bir biçimde solüsyona alınabildiği tespit edilmiştir. Biyolojik geri kazanım deneylerinde 24 faktöriyel dizayna göre oluşturulan 4 farklı değişkenin (MS konsantrasyonu, pH, deney süresi ve deney sıcaklığı), 3 farklı seviyede etkisi araştırılmıştır. Elde edilen sonuçlar, yüksek pH değerlerinde tüm elementlerin %79-100 oranında geri
kazanıldığını göstermiştir. Kimyasal geri kazanım çalışmalarında, 8 M NaOH ile farklı pH değerlerinin giderime olan etkisi incelenmiş ve presipitasyon sonrasında %95 Pb ve %94 Zn geri kazanımı elde edilmiştir.

Keywords

Çinko, Geri Kazanım, Kurşun, Maden Atığı, Mikrobiyal Selüloz, Presipitasyon

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