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molybdenite-concentrate
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Determination of optimal conditions for pressure oxidative leaching of sarcheshmeh molybdenite concentrate using Taguchi method
, Article Journal of Mining and Metallurgy, Section B: Metallurgy ; Volume 48, Issue 1 , 2012 , Pages 89-99 ; 14505339 (ISSN) ; Yoozbashizadeh, H ; Sharif University of Technology
2012
Abstract
The present research work is based on finding the optimum conditions for pressure oxidative leaching of the molybdenite concentrate to produce technical-grade molybdic oxide (MoO 3) with high recovery through further treatment of the filtrate solution. The Taguchi method was used to design and minimize the number of experiments. By using Taguchi orthogonal (L 25) array, five parameters (time, temperature, oxygen pressure, pulp density and acid concentration) at five levels were selected for 25 experiments. The experiments were designed and carried out in a high-pressure reactor in the presence of nitric acid as solvent and oxidizing agent for the molybdenite concentrate and its ReS 2...
Hydrometallurgical Extraction of Molybdenum and Rhenium from Sarcheshmeh Molybdenite Concentrates by Acidic Pressure Leaching
, Ph.D. Dissertation Sharif University of Technology ; Yoozbashizadeh, Hossein (Supervisor)
Abstract
The current study was carried out to investigate the pressure oxidative leaching of the molybdenite concentrate in nitric acid to produce molybdic oxide (technical grade) and liquor containing entire rhenium of the concentrate and molybdenum. In the first step The Taguchi method was established to design and minimize the number of experiments. By using Taguchi orthogonal (L25) array, five parameters (time, temperature, oxygen pressure, pulp density and acid concentration) in 5 levels were selected for 25 experiments. Experiments were designed and carried out in a high pressure reactor in the presence of nitric acid as solvent and oxidizing agent for the molybdenite concentrate and its ReS2...
Separation of rhenium and molybdenum from molybdenite leach liquor by the solvent extraction method
, Article Minerals and Metallurgical Processing ; Volume 30, Issue 1 , February , 2013 , Pages 53-58 ; 07479182 (ISSN) ; Yoozbashizadeh, H ; Mohammadi, M ; Abazarpoor, A ; Maarefvand, M ; Sharif University of Technology
2013
Abstract
Molybdenum resources around the world are mainly associated with porphyry copper ores. Molybdenite (MoS2) is the main Mo mineral that has rhenium in its crystal lattice. This paper investigates the recovery of rhenium and molybdenum from a molybdenite concentrate using a hydrometallurgical treatment method. The molybdenite concentrate is leached with nitric acid and subjected to solvent extraction to recover and separate rhenium and molybdenum from the leached liquor. The effects of pH and the chemicals' concentration on extraction characteristics of Mo and Re are investigated to define the best condition for selective extraction of these metals. The tested leached liquor contained of 8.2...
Kinetics of pressure oxidative leaching of molybdenite concentrate by nitric acid
, Article Hydrometallurgy ; Volume 111-112, Issue 1 , January , 2012 , Pages 52-57 ; 0304386X (ISSN) ; Yoozbashizadeh, H ; Mozammel, M ; Sadrnezhaad, S. K ; Sharif University of Technology
2012
Abstract
The current study was carried out to investigate the kinetics of reactions for the pressure oxidative leaching of a molybdenite concentrate in less than one hour. The effects of oxygen pressure, stirring speed, pulp density, acid concentration and temperature on the leaching rate of the molybdenum were studied. It was found that about 85% of molybdenite was oxidized to molybdic oxide precipitate with remaining molybdenum dissolved in the leaching liquor. Analysis of experimental data showed that the reaction is chemically controlled with activation energy of 68.8 kJ/mol. Furthermore SEM images showed no significant boundary diffusion layer and it was noted that the molybdic oxide...
Application of artificial neural networks to predict pressure oxidative leaching of molybdenite concentrate in nitric acid media
, Article Mineral Processing and Extractive Metallurgy Review ; Volume 33, Issue 4 , Jul , 2012 , Pages 292-299 ; 08827508 (ISSN) ; Yoozbashizadeh, H ; Sharif University of Technology
Taylor and Francis Inc
2012
Abstract
This study is concerned with investigation of pressure oxidative leaching of entire molybdenum of a molybdenite concentrate. Effects of oxygen pressure, stirring speed, pulp density, acid concentration, and temperature on the leaching rate of molybdenum were studied. A three-layer feed-forward artificial neural network was applied to model the effect of the abovementioned parameters on the leaching ability. The leaching efficiency was considered as a target value for modeling. The quantified leaching efficiencies obtained by applying different parameters demonstrated a good agreement with neural network predictions