Roasting Kinetics of Molybdenite Concentrates | SpringerLink
In this study molybdenite (MoS 2) is roasted in both chamber type furnace and rotary kiln under different conditions such as different temperatures and air …Web
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In this study molybdenite (MoS 2) is roasted in both chamber type furnace and rotary kiln under different conditions such as different temperatures and air …Web
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DOI: 10.1021/acssuschemeng.2c04052 Corpus ID: 254201309; Investigation of the Roasting Behavior of Mixtures of Molybdenum Trioxide and Molybdenum Concentrates @article{Zhang2022InvestigationOT, title={Investigation of the Roasting Behavior of Mixtures of Molybdenum Trioxide and Molybdenum Concentrates}, …Web
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The sulfur was converted to calcium sulfate for the lime-roasting, ... heating equipment and Evaporator-Condenser set The schematic diagram of the vertical vacuum distillation furnace is shown in Fig. ... Thermodynamic analysis of vacuum decomposition process of molybdenum concentrate. Chin. J. Nonferrous Met. 25(1), 190–196 (2015)Web
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A process and system are provided for flash-roasting molybdenum sulfide containing slag-forming constituents. The process comprises feeding a pneumatically suspended stream of particulate molybdenum sulfide and a mixture of fuel and oxidizing gases through a nozzle into a confined furnace chamber, the fuel gas-oxidizing gas mixture …Web
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Roasting of molybdenum concentrates with sodium chloride has high potential and can be an ... grinding of the mixture in a furnace charge leads to an increase in the polymolybdate fraction of ...Web
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Al 2 O 3 (purity of 99.9 wt.%, Aladdin) and SiO 2 (purity of 99.9 wt.%, Aladdin) are selected as additives for preparing molybdenum concentrate green pellets. The compressed nitrogen (purity of 99.9%) and air mixed gas was used for oxidative roasting of green pellets. Al 2 (MoO 4) 3 used in this work is a synthetic reagent, which is …Web
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The Roasting Process. As the material was low grade molybdenum concentrate, in addition, more talc and calcite were also contained. In order to make the molybdenum concentrate fully roasted and oxidized, MnO 2 was chosen as the oxidant. The influences of roasting temperature, roasting time and the quantity of oxidant were …Web
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The utility model discloses a fluidized roasting furnace suitable for molybdenite concentrate. The fluidized roasting furnace comprises a hearth, wherein the upper end of the hearth is provided with an arc-shaped arch crown and a silo flue, the lower end of the hearth is provided with an air bellow, tubular water jackets are uniformly distributed on …Web
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The present invention relates to a kind of molybdenite concentrate self-heating eddy flow roasting technique and equipment, using the eddy flow roaster roasting molybdenite concentrate with furnace body heat-exchanger rig to produce industrial molybdenum oxide, the air that the heat preheating that roasting process is released using …Web
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Roasting is performed in a multiple hearth, vertical furnace with the purpose to remove sulfur from the mineral. The roasting furnace is typically designed with 8 levels and running at an operating temperature not higher than 750 °C . The furnace temperature should be strictly controlled to minimize molybdenum losses due to sublimation.Web
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The goals of the roasting process are to maximize desulfurization of the concentrate and to oxidize molybdenum to its highest oxidation state (+6) leading to the formation of …Web
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This invention relates to the flash roasting of molybdenum sulfide concentrate containing slag-forming constituents and, in particular, to a process for roasting molybdenum sulfide to volatile molybdenum trioxide and the separation thereof from contained slag-forming constituents and off-gases. ... FIG. 2 is a vertical cross section of the ...Web
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The roasting process is carried out in an oxidizing atmosphere in a vertical furnace with eight levels at a maximum temperature of 680° to 750°C to avoid evaporation losses of MoO 3 with gases. Despite the seeming simplicity of roasting of molybdenum concentrate, industrial realization of the process to get concentrate suitable for smelting ...Web
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Molybdenum—an element of the VIb group of the Periodic system of elements. The atomic number of molybdenum is 42, the atomic mass is 95.94; configuration of the outer electron shell of an atom 4d 5 5s 1, melting temperature 2622 °C, boiling 4840 °C, density 10.23 g/cm 3.. Mo–Fe system.Iron and molybdenum form …Web
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The goals of the roasting process are to maximize desulfurization of the concentrate and to oxidize molybdenum to its highest oxidation state (+6) leading to the formation of molybdenum trioxide. During the roasting process, a furnace is brought up to 600°C temperature by combusting a fuel (natural gas, fuel oil, or coal).Web
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The roasting of molybdenum concentrates using NaCl has been carried out. During the roasting process, Mo is present both as a gas (25–40%) and as solid residue …Web
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The roasting process is carried out in an oxidizing atmosphere in a vertical furnace with eight levels at a maximum temperature of 680° to 750°C to avoid …Web
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rhenium extraction from the leach solutions of the dust of the molybdenite roasting furnaces. doi: 10.5829/idosi.ije.2014.27.04a.17 1. INTRODUCTION1 Rhenium is a less common metal with special ...Web
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The present invention provides a roasting furnace for processing ores or concentrates, preferably molybdenum-containing ores or concentrates, wherein the roasting furnace contains at least one first rotary lifting system for the displacement of said arm along the axis direction, wherein said first rotary lifting system is a telescopic lifting system, and/or …Web
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Molybdenum trioxide is obtained via oxidation roasting of molybdenite (MoS 2) concentrates. Industrially, this process mostly is made in multiple hearth furnaces. …Web
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The present invention provides a roasting furnace for processing ores or concentrates, preferably molybdenum-containing ores or concentrates, wherein the roasting furnace contains at least one first rotary lifting system for the displacement of said arm along the axis direction, wherein said first rotary lifting system is a telescopic lifting system, and/or …Web
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1. Introduction. Molybdenum concentrates are generally processed using technologies based on oxidizing roasting followed by hydrometallurgical processing of the roasted product (Zelikman, 1970).Although this method is the main way for the molybdenum production and has long been used in industry, studies on its application …Web
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As an alternative to the conventional technology for processing molybdenite concentrate, the authors have previously proposed a method comprising a low-temperature roasting (450 °C) with sodium chloride and subsequent two-stage leaching of cinder with water (first stage) and alkali solution (second stage) [16, 17].The filtrates can then be …Web
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Herein, the leaching of molybdenum and rhenium from the molybdenite roasting flue dust in H 2 SO 4 was studied. The parametric studies showed that leaching performed at a pulp density, 10 wt./vol.%; H 2 SO 4 concentration, 1.0 M; temperature, 90 °C; and time, 90 min was sufficient to yield 96% molybdenum and 93% rhenium. The …Web
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Molybdenite concentrate is the principal source from which molybdenum is extracted. The commercial route for the extraction of molybdenum involves roasting of its concentrate, purification of the resultant calcine by hydrometallurgical way to MoO 3, and hydrogen reduction of the trioxide to the metal.Although this method is the main way for …Web
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Molybdenum concentrate is fed from the roaster feed bin to the belt feeder, where discharge occurs into the screw conveyor-following which the concentrate is fed into the roaster. ......Web
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The thermal test results of conventional rotary kiln present that coal, as an external heat source, provides heat of 4.42 GJ/t by flue gas after combustion, in which …Web
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During the roasting process, Mo is present both as a gas (25–40%) and as solid residue (60–75%). Molybdenum chloride and oxychloride condensate both …Web
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3 was prepared from molybdenite concentrate through oxidation roasting in a microwave heating system and a resistance furnace, respectively. The phase transitions and morphology evolutions during oxidation roasting were characterized through X-ray diffraction and scanning electron microscopy. Results show that microwave thermal …Web
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The molybdenum concentrate processing capacity is 3-3.5 t/h, the roasting temperature of each layer ranges from 550 ℃ to 800 ℃, and fuel is natural gas and is mixed with air for combustion. The middle rotating shaft of the multi-hearth furnace is of a hollow structure, air cooling is adopted, hot air is directly exhausted after calcination ...Web
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Molybdenum trioxide (MoO3) production is one of the most important stages in molybdenum production. In this study, the effects of different furnace types on MoO3 …Web
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The raw material that used in roasting process is local molybdenite concentrate. Figure 1 shows the XRD pattern of concentrate and Table 1 gives the chemical analysis of MoS 2 analyzed by AAS. In this study MoS 2 was roasted in both chamber type furnace and rotary kiln. Alumina boats were used to roast MoS 2 in …Web
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(a) Roasting process of Mo concentrate in multiple hearth furnace (Zhang 2005); (b) Temperature distribution of each layer in a multiple hearth furnace (Ju and Gong, 2010); (c) Percentage of Mo and Re contents in each layer of multiple hearth furnace (Zhang 2005); (d) Process of Mo and Re extraction in oxidation roasting process (Liu et …Web
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The present invention relates to a kind of molybdenite concentrate self-heating eddy flow roasting technique and equipment, molybdenite concentrate is roasted using the eddy flow roaster with furnace body heat-exchanger rig to produce industrial molybdenum oxide, the air that the heat preheating that roasting process is released using …Web
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Molybdenum trioxide is obtained via oxidation roasting of molybdenite (MoS 2) concentrates. Industrially, this process mostly is made in multiple hearth furnaces. Oxidation begins at 360°C, but it becomes significant after 500°C [ 4 ]. Molybdenum …Web
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