The removal of heavy metals from refinery effluents by sulfide precipitation
[ X ]
Tarih
2023
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
BERG FAC TECHNICAL UNIV KOSICE
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
This study investigated the selective precipitation of copper (Cu2+), nickel (Ni2+) and zinc (Zn2+) ions from industrial wastewater by using sodium sulfide (Na2S). The effects of pH, time and free sulfide concentration on the selective precipitation were systematically investigated using synthetically prepared solutions and gold refinery wastewater. First, the optimum precipitation pH values of metals, the amount of Na2S and time were determined by using synthetic solutions containing Cu, Ni and Zn single metal ions. The highest precipitation efficiencies were obtained at a pH of 4, 5.3 and 5.3 for Cu, Ni and Zn, respectively. Based on these results, the effects of Na2S stoichiometry and time of precipitation were investigated with synthetically prepared solutions containing mixed metal ions (100?mg/L Cu2+, 90?mg/L Ni2+ and 100?mg/L Zn2+). Metal sulfide precipitation efficiencies increased with increasing amounts of Na2S and reached a maximum at a ratio of 1:1.75 (Metal ion: Na2S molar ratio). Lastly, the results obtained from the experiments performed with synthetic solutions were used for the metal sulfide precipitation from industrial wastewater. The precipitation from refining wastewater containing 10 g/L Cu2+, 0.3 g/L Ni2+ and 3 g/L Zn2+ ions was achieved at pH values from 2.3 to 5.3. At a pH of 2.3, Cu2+ precipitated as CuS (Cu2S) at 100% efficiency. While the Ni2+ concentration in the solution decreased by only 44% at a pH of 2.3, the Zn2+ concentration decreased by 52%. At a pH of 5.3, Cu2+ and Zn2+ precipitated together at 100%.
Açıklama
Anahtar Kelimeler
Copper sulfide, Nickel sulfide, Precipitation, Sulfide precipitation, Metal sulfide
Kaynak
ACTA MONTANISTICA SLOVACA
WoS Q Değeri
Q3
Scopus Q Değeri
Q2
Cilt
28
Sayı
1
Künye
Kartal, L., Şen, A. ,Timur, T. (2023). The removal of heavy metals from refinery effluents by sulfide precipitation. Acta Montanistica Slovaca, 28(1).
