Gümüştaş Madencilik Tic. A.Ş. (Gümüşhane)
Bu çalışmaya maddi destek sağlayan, sahadan numunelerin alınmasına ve analiz edilmesine yardımcı olan Gümüştaş Madencilik Tic. A.Ş. (Gümüşhane)’ye, özellikle Erdal GÜLDOĞAN ve Uğur ÖLGEN’e katkılarından dolayı teşekkür ederiz.
The primary source of environmental pollution in mining activity is acid drainage, which mostly occurring metallic, coal, and asphaltite mines. In this study, the acid producing potential of Pb-Zn mineralization from flotation plant tailings was investigated by geochemical analysis and static tests including short-term contact leakage tests and Acid-Base Accounting (ABM) processes. The mineral assemblage of the processed ore mainly consists of pyrite, chalcopyrite, sphalerite, and galena minerals. The high enrichment in trace element concentrations of ore-bearing tailings samples, especially in potentially toxic metals such as S, Zn, Cu, As, Sb, Cd, Hg, Ag, and Bi is directly related to the type of mineralizations, and they have the potential to contaminate groundwater. According to short-term contact leaching tests, the pH (9.55-10.60, n= 10) values of samples indicated that they are four-class (IV) quality by classification of the intra-continental water resources. Besides, sulphide-sulfur (%S-2: 2.92-3.98, n= 10), Net Neutralization Potential (NNP; -32 kg CaCO3/t -149 kg CaCO3/t, n= 10), and Neutralization Potential Ratio (NPR; 0.20-0.80, n= 10) values show that the ore-bearing tailings material has an acid production potential. Lugeon tests were carried out to evaluate rock mass permeability in drilling wells drilled in the dam axis location and reservoir area and it was determined to be permeable (K= 2x10-6 m/s). In order to make the reservoir impermeable, 40-50 cm thick clay was laid and compacted, and the formed section was modeled by finite elements method, and permeability and wastewater discharges were determined. In the modeling with finite element seepage analysis, the wastewater discharge value obtained at a depth of 5m from the foundation excavation was determined as 5.63x10-8 m3/s. Also, the permeability value for the reservoir area was determined as 9.79x10-10 m/s after the applied clay compaction process. In addition, the environment will be completely impermeable as a result of laying geotextiles such as geosynthetic clay membrane, geomembrane and drainage geocomposite on the bottom of the reservoir area to prevent a possible chemical leakage. Thanks to these applications, surface and groundwater pollution will be prevented due to the potential of acid production of flotation plant tailings.
|27 Nisan 2020
|24 Şubat 2020
|27 Nisan 2020
|Yıl 2020 Cilt: 41 Sayı: 1