Browsing by Author "Hussaini S."

Now showing 1 - 2 of 2

Leaching of Turkish Oxidized Pb–Zn Flotation Tailings by Inorganic and Organic Acids
(Springer, 2020) Kaya M.; Kursunoglu S.; Hussaini S.; Gul E.; AGÜ, Mühendislik Fakültesi, Malzeme Bilimi ve Nanoteknoloji Mühendisliği Bölümü
n eco-friendly approach and simultaneous recovery of metals from mine tailings is still a significant challenge. This study investigates the extraction of zinc metal from the Kayseri region oxidized lead-zinc (Pb–Zn) flotation tailings by leaching using three different inorganic acids (HNO3, HCl, and H2SO4) and six different organic acids (citric (CA), oxalic (OA), formic (FA), ascorbic (AA), malic (MA), and tartaric (TA) acids). The effects of acid type and concentration, leaching temperature and time, and solid/liquid (S/L) ratio were studied for maximum Zn dissolution and minimum Pb, Fe, and As co-dissolution at lowest temperature and leaching time. For inorganic acids at 1/10 S/L ratio, 1.0 M H2SO4 and HCl concentrations achieved 92% Zn + 0% Pb + 12% Fe at 40 °C leaching temperature and 60 min leaching time and 92% Zn + 10% Pb + 0% Fe at 80 °C leaching temperature and 30 min leaching time, respectively. For organic acids, at 1/10 S/L ratio and 1.0 M concentration, 92% Zn + 8.3% Pb with malic acid at 80 °C leaching temperature and 180 min leaching time and 91% Zn + 12% Pb with citric acid at 60 °C leaching temperature and 180 min leaching time were achieved. 1.0 M formic acid dissolved about 83% Zn + 2.8% Pb at 80 °C and 180 min leaching time. More than 90% Zn dissolution can be succeeded by using either inorganic acids at 40 °C for 30–60 min leaching time or organic acids at 60–80 °C for 180 min leaching time. Oxalic acid significantly dissolved Fe and As without Zn and Pb dissolution. © 2020, The Minerals, Metals & Materials Society.
Leaching of yahyali non-sulphide PB-ZN flotation tailing using organic acids
(Baski, 2019) Hussaini S.; Kursunoglu, Sait; Kaya, Muammer; 0000-0002-1680-5482; AGÜ, Mühendislik Fakültesi, Malzeme Bilimi ve Nanoteknoloji Mühendisliği Bölümü; Kursunoglu, Sait
The laboratory scale leaching of Kayseri-Yahyali non-sulphide lead (Pb)-zinc (Zn) flotation tailing using two organic acids was experimentally investigated. The effect of citric and oxalic acid on the dissolution of Zn, Pb, iron (Fe) and arsenic (As) was individually investigated under the following conditions: citric or oxalic acid concentration of 0.5-1.0M, temperature of 60-80°C and leaching time of 30-180 min. at 1/10 solid-to-liquid (S/L) ratio. 90.1% Zn dissolution was achieved using 0.5 M citric acid at 80°C leaching temperature for 180 min leaching time. The Fe, Pb and As dissolutions were determined as less than 20% under the conditions tested. 95.5% Fe and 68.8% As were removed from the flotation tailing along with less than 5% of Zn and Pb using 1.0 M oxalic acid for 180 min. leaching time at 60°C leaching temperature. It was found that citric acid is more prominent than oxalic acid for the selective leaching of zinc from the flotation tailing whereas a substantial amount of iron and arsenic removal can be achived by oxalic acid leaching. The use of NaCl along with citric acid was not useful for higher Zn dissolution. Based on the experimental results, an appropriate process will be improved for the selective leaching of valuable metals from the Pb-Zn non-sulphide flotation tailing in the near future. Copyright