The addition of NaCl in the ammonium persulfate-APS(as an oxidant)leaching was investigated.APS has some advantages compared with conventional oxidants and its standard redox potential(E°)is2.0V.Effect of six par...The addition of NaCl in the ammonium persulfate-APS(as an oxidant)leaching was investigated.APS has some advantages compared with conventional oxidants and its standard redox potential(E°)is2.0V.Effect of six parameters such as NaCl concentration,APS concentration,temperature,time,liquid–solid ration(L/S),and stirring speed on the leaching behavior was studied.Results showed that metals extraction increased with increasing of NaCl concentration,APS concentration,leaching temperature(up to333K),and L/S ratio.During oxidative leaching of sulfide minerals,the occurrence of elemental sulfur layer on particle surface is known as primary problem that causes low metal extraction.According to the results,the passivation effect of sulfur layer and low dissolution problems can be eliminated in the presence of chloride ions.Copper and iron extraction yields were obtained as75%and80%,respectively under leaching conditions as follows:APS concentration250g/L;NaCl concentration150g/L;time180min;temperature333K;stirring speed400r/min;and L/S250mL/g.展开更多
In this study, pyrolusiteore （MnO2） was subjected to mechanical milling with a high-energy mill with carbonized tea plant wastes and the effect of grinding time on the crystal structure of the material was investiga...In this study, pyrolusiteore （MnO2） was subjected to mechanical milling with a high-energy mill with carbonized tea plant wastes and the effect of grinding time on the crystal structure of the material was investigated. The ratio of Mn/Fe was 8/1, the ratio of C/（MnO2 ＋ Fe3O4） was 2 and the ratio of ball to ore was 10/1. The samples were mechanically ground at 10, 15, 20, 30, 60, 90 and 120 hours. In the processes performed on the attritor, the rotation speed of the mill shaft was determined to be 350 rpm. The results were characterized by TG-DTA, SEM and XRD analyzes. As a result of the experimental studies, it was observed that the samples subjected to mechanical grinding for 120 hours were gradually reduced due to the increasing grinding time at all the diffraction peaks when the XRD peaks were compared with the grinding times. In the thermogravimetric analysis, the sample milled for 120 hours, 50% weight loss was observed at 470 ℃, weight loss of up to 56% was observed at progressive temperatures.展开更多
基金supported by the FUBAP(Firat University scientific research projects)under the project No:MF.12.32
文摘The addition of NaCl in the ammonium persulfate-APS(as an oxidant)leaching was investigated.APS has some advantages compared with conventional oxidants and its standard redox potential(E°)is2.0V.Effect of six parameters such as NaCl concentration,APS concentration,temperature,time,liquid–solid ration(L/S),and stirring speed on the leaching behavior was studied.Results showed that metals extraction increased with increasing of NaCl concentration,APS concentration,leaching temperature(up to333K),and L/S ratio.During oxidative leaching of sulfide minerals,the occurrence of elemental sulfur layer on particle surface is known as primary problem that causes low metal extraction.According to the results,the passivation effect of sulfur layer and low dissolution problems can be eliminated in the presence of chloride ions.Copper and iron extraction yields were obtained as75%and80%,respectively under leaching conditions as follows:APS concentration250g/L;NaCl concentration150g/L;time180min;temperature333K;stirring speed400r/min;and L/S250mL/g.
文摘In this study, pyrolusiteore （MnO2） was subjected to mechanical milling with a high-energy mill with carbonized tea plant wastes and the effect of grinding time on the crystal structure of the material was investigated. The ratio of Mn/Fe was 8/1, the ratio of C/（MnO2 ＋ Fe3O4） was 2 and the ratio of ball to ore was 10/1. The samples were mechanically ground at 10, 15, 20, 30, 60, 90 and 120 hours. In the processes performed on the attritor, the rotation speed of the mill shaft was determined to be 350 rpm. The results were characterized by TG-DTA, SEM and XRD analyzes. As a result of the experimental studies, it was observed that the samples subjected to mechanical grinding for 120 hours were gradually reduced due to the increasing grinding time at all the diffraction peaks when the XRD peaks were compared with the grinding times. In the thermogravimetric analysis, the sample milled for 120 hours, 50% weight loss was observed at 470 ℃, weight loss of up to 56% was observed at progressive temperatures.
