WoS İndeksli Yayınlar Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12573/394
Browse
3 results
Search Results
Article Citation - WoS: 4Citation - Scopus: 5Recovery of Manganese From Spent Batteries Using Activated Carbon Powder as Reductant in Sulfuric Acid Solution(Asian Journal of Chemistry, 2013) Kursunoglu, Sait; Kaya, MuammerRecovery of manganese from spent batteries was investigated using activated carbon powder as a reducing agent in sulfuric acid solution. The effects of four different leaching parameters (sulfuric acid concentration, amount of activated carbon powder, temperature and time) on the leaching of manganese from spent batteries were investigated using central composite design technique. The maximum manganese recovery conditions were determined as 1 M of sulfuric acid concentration, 3 g of activated carbon powder, 80 degrees C of temperature and 3 h of leaching time. Under these conditions, the recovery of manganese was 86.39 % and pH value of the solution was 0.77. According to the reductive acid leaching results, an empirical second order equation for manganese recovery based on four investigated parameters was calculated. The observed values of manganese recoveries using model equation were found to be in a good agreement with the predicted values (R-2 = 0.92).Conference Object Citation - WoS: 13Citation - Scopus: 13Leaching of Turkish Oxidized Pb-Zn Flotation Tailings by Inorganic and Organic Acids(Springer International Publishing AG, 2020) Kaya, Muammer; Kursunoglu, Sait; Hussaini, Shokrullah; Gul, ErkanAn 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, 1.0MH(2)SO(4) and HCl concentrations achieved 92% Zn + 0% Pb + 12% Fe at 40 degrees C leaching temperature and 60 min leaching time and 92% Zn + 10% Pb + 0% Fe at 80 degrees C leaching temperature and 30 min leaching time, respectively. For organic acids, at 1/10 S/L ratio and 1.0M concentration, 92% Zn + 8.3% Pb with malic acid at 80 degrees C leaching temperature and 180 min leaching time and 91% Zn + 12% Pb with citric acid at 60 degrees C leaching temperature and 180 min leaching time were achieved. 1.0 M formic acid dissolved about 83% Zn + 2.8% Pb at 80 degrees C and 180 min leaching time. More than 90% Zn dissolution can be succeeded by using either inorganic acids at 40 degrees C for 30-60 min leaching time or organic acids at 60-80 degrees C for 180 min leaching time. Oxalic acid significantly dissolved Fe and As without Zn and Pb dissolution.Conference Object Citation - Scopus: 2Dissolution of Mixed Zinc-Carbon and Alkaline Battery Powders in Sulphuric Acid Using Ascorbic/Oxalic Acid as a Reductant(Minerals, Metals and Materials Society 184 Thorn Hill Road Warrendale PA 15086, 2012-03-17) Kaya, Muammer; Kursunoglu, SaitThe aim of this study was to investigate the effectiveness of ascorbic (C<inf>6</inf>H<inf>8</inf>O<inf>6</inf>) / oxalic (C<inf>2</inf>H <inf>2</inf>O<inf>4</inf>) acid as a reductant for the simultaneous recovery of zinc and manganese from a spent and mixed zinc-carbon and alkaline battery powder in sulphuric acid leaching. The effects of sulfuric acid concentration, ascorbic/oxalic acid dosages, reaction temperature and leaching time on the zinc and manganese dissolutions were investigated according to 2k full factorial experimental design; then, a simple optimization study was carried out for the best reductant. The optimum reductive acid leaching conditions were determined at 3 hours leaching time, 70°C leaching temperature, 0.5M sulfuric acid concentration, 13 g/L ascorbic acid dosage, 1/20 g/mL solid/liquid ratio and 200 rpm stirring speed. Under these conditions, the dissolution efficiencies were 99.9% for Zn and 99.3% for Mn. When our results were compared with the previous results, our findings were better than previous studies. In addition, the manganese dissolution kinetics was undertaken, and the activation energy was found to be 7.04 kJ/mol. Selective precipitations of Zn and Mn from acid solutions were carried out using NaOH and KOH. Using 3M NaOH as precipitating agent at room temperature and at pH 8; 95.4% of Zn and at pH 10; 93.7% of Mn were precipitated from the leaching solution. Under the same conditions, using 3 M KOH at pH 8; 91.6% of Zn and at pH 10, 96.4% of Mn were precipitated. Based on the experimental results obtained, an appropriate flow sheet was proposed to recover zinc and manganese. © 2020 Elsevier B.V., All rights reserved.