Comparison of the Effect of NaClO 3 and H 2 O 2 on the Molybdenum Leaching from Molybdenite Concentrate
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ORIGINAL ARTICLE
Comparison of the Effect of NaClO3 and H2O2 on the Molybdenum Leaching from Molybdenite Concentrate Amir Ganbari Arbat1 • Erfan Asghari Fesaghandis1 • Arvin Taghizadeh Tabrizi1 Hossein Aghajani1,2
•
Received: 31 March 2020 / Accepted: 28 June 2020 Ó The Indian Institute of Metals - IIM 2020
Abstract In the present study, the leaching of molybdenum from molybdenite concentration in the hydrochloric acid medium was investigated and the comparison was made between the effect of the sodium chlorate and hydrogen peroxide as oxidizing agents on the Mo-dissolution rate. Also, the effect of adiabatic temperature was studied on the Mo-dissolution rate. The leaching parameters were studied, and the optimum conditions were determined as temperature 80 °C, time 4 h, L/S ratio 1:20, 20% of HCl concentration, and 500 rpm as agitation. The results showed that sodium chlorate had a better impression than hydrogen peroxide, almost twice higher than it. Undermentioned optimum conditions, 89.3% of Mo-dissolution rate was achieved. Keywords Molybdenum Leaching HCl NaClO3 Oxidizing agent
1 Introduction Adding the molybdenum element to the liquid cast iron, steel, and superalloys to enhance mechanical properties, e.g., hardenability, strength, toughness, wear, and corrosion resistance, is one of the most common applications of this element in the industry [1]. Therefore, it can be declared
& Arvin Taghizadeh Tabrizi [email protected] 1
Materials Engineering Department, University of Tabriz, Tabriz, Iran
2
Faculty of Materials and Metallurgical Engineering, Iran University of Science and Technology, Tehran, Iran
that molybdenum is a strategic metal element in diverse industries [2]. There are about 30 minerals in which molybdenum has been found, but only molybdenite (MoS2) and wulfenite (PbMoO4) have sufficient molybdenum to be considered as molybdenum ore and of them, molybdenite is the most important one [3, 4]. Molybdenum is mainly found in molybdenite ores (MoS2) which is associated with copper ores, and it is the by-product of the copper extraction process [5]. Also, the Mo-concentrate is the main source for rhenium since it is in association with ReS2. The concentrate of molybdenite contains 0.001–0.1% rhenium, and it needs further solvent extraction to obtain it [6]. Various methods have been developed to extract molybdenum from its resources including primary and secondary ones [7, 8]. Roasting is the major and primary method of molybdenite treatment. Due to the high applied temperature in roasting treatment, a high amount of energy has been used in this process. As for example, Wang et al. [9] applied two-step oxidation roasting and water leaching to extract molybdenum and nickel from carbonaceous shale ore and 92.1% efficiency was obtained for molybdenum. Therefore, researches attract attention to develop a process with lower energy usage and introduce hydrometallurgical methods [2]. In hydrometallurgical routes, a certain amount of concentrate dissolves in aqueous solutions under a certa
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