Leaching kinetics in cyanide media of Ag contained in the industrial mining-metallurgical wastes in the state of Hidalgo,Mexico |
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| Affiliation: | 1. State Key Lab Cultivation Base, Henan Province Key Lab of Gas Geology & Gas Control, Henan Polytechnic University, Jiaozuo 454003, China;2. School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China;3. School of Resources & Safety Engineering, China University of Mining & Technology, Beijing 100083, China;1. Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals, Qingdao 266590, China;2. College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China;3. College of Information Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China;1. Faculty of Mining and Metallurgical Engineering, Yazd University, Yazd 89195-741, Iran;2. Mining Engineering Group, Shahid Bahonar University of Kerman, Kerman 76175-133, Iran;1. Department of Neurosurgery, Neurological Institute, Cleveland Clinic, Cleveland, USA;2. Rose Ella Burkhardt Brain Tumor and Neuro-Oncology Center, Cleveland Clinic, Cleveland, USA;3. Department of Neurosurgery, Geisinger Health System, Danville, USA |
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| Abstract: | The leaching kinetics in cyanide media of the silver contained in the Dos Carlos waste tailings at the City of Pachuca de Soto, Hidalgo State, Mexico were carried out. The used material contained the following chemical composition: 56 × 10-6 of Ag, 0.6 × 10?6 of Au and 70.43% (by weight) of SiO2; 7.032% (by weight) of Al2O3; 2.69% (by weight) of Fe; 0.46% (by weight) of Mn; 3.98% (by weight) of K2O; 3.34% (by weight) of CaO; 2.50% (by weight) of Na2O; 0.04% (by weight) of Zn; 0.026% (by weight) of Pb. The mineralogical phases present were the following: Silica, albite, argentite, berlinite, orthoclase, potassium jarosite, and natrojarosite. In the leaching kinetics in cyanide media, and under the studied conditions, the effect of the CN? concentration on the reaction rate has no effect on the whole process of alkaline cyanidation, of which the reaction order is n ≈ 0. Temperature has an effect on the cyanidation rate of the reaction, with an activation energy of 47.9 KJ/mol. At the same time, when the particle size decreases there is an increase in the reaction rate, which is inversely proportional to the particle diameter; when increasing the NaOH concentration there is an increase in the reaction rate Kexp, with a reaction order (n) of 0.215 under the studied ranges. |
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| Keywords: | Silver Waste tailings Cyanidation Leaching |
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