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

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

The removal of impurities in molybdenum concentrate has become a new challenge for enterprises due to the cancellation of pickling. Whether impurity minerals can be converted into soluble ions during roasting is important for the impurity removal by current water washing. In this work, the interaction between various impurity elements in …Web

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

The subject of this study is a molybdenum concentrate produced by flotation of copper-molybdenum ores from the Erdenet mineral deposit. The molybdenum concentrate composition (wt%) is 45.23% Mo, 2.30% Fe, and 1.41% Cu. ... The concentrate was mixed with sodium chloride in desired proportions and then roasted in …Web

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

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

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

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

acid-leached concentrate (leaching residue) was roasted at 550 C for 100 min. By the subsequent ammonia leaching, 91.5% molybdenum was leached out from the calcine produced from oxidative roasting of the acid-leached concentrate, while only 79.3% Mo was leached from the calcine produced by roasting molybdenite concentrate without …Web

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

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

The results showed that molybdenite concentrate was oxidized directly to MoO 3 in pure oxygen atmosphere. There were remarkable changes of the morphologies of products with the increase of the roasting temperature. It was also found that sintering phenomenon occurred during the roasting process in pure oxygen when the …Web

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

Roasting is performed in a multiple hearth, vertical furnace . ... (ORE), air (AIR), roasted molybdenum concentrate (RMC), and . flue gas (GAS) in the roaster, respectivel y.Web

(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

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

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

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

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

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

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

furization of the concentrate.2 However, the flu-idized bed process is difficult to control due to its higher operating temperatures and the sublimation of molybdenum oxide. Such furnaces experience high levels of dust losses reducing the overall yield of molybdenum trioxide. Thus, multiple-hearth roasting of molybdenite is the commercially pre-Web

acid-leached concentrate (leaching residue) was roasted at 550 C for 100 min. By the subsequent By the subsequent ammonia leaching, 91.5% molybdenum was leached out from the calcine produced from ...Web

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

A roasting furnace for processing ores or concentrates, preferably molybdenum-containing ores or concentrates is described. 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 wherein a distance x …Web

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

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

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

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

Technical grade molybdic oxide, consisting of 90 to 95 percent MoO3, is produced by roasting molybdenite concentrate in a multiple hearth furnace at temperatures up to 650°C.7 Molybdenum concentrates may be leached with nitric acid prior to roasting to reduce the alkali concentrations in the concentrates.8 The roasting processWeb

A process is disclosed for roasting molybdenite concentrates directly to molybdenum dioxide. The process comprises establishing a roasting zone having a temperature of about 700/sup 0/ C. to about 800/sup 0/ C., introducing into the roasting zone particulate molybdenum dioxide and molybdenite in a weight ratio of at least about …Web

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

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

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

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

The application of molybdenum disulfide two-dimensional layered materials is seriously restricted by the relatively high content of iron. Considering the direct purification of MoS 2, vacuum chlorination roasting for decreasing iron of molybdenum concentrate is proposed. Thermodynamics of iron removal by vacuum chlorination roasting is analyzed.Web

When the roasting parameters are optimized as follows: roasting temperature 600 °C, roasting time 2 h, roasting atmosphere air, the volatilization rate of rhenium reaches 89.26%. In the process of solidification roasting, the volatilization rate of rhenium decreased almost to zero when the ratio of slaked lime/molybdenum concentrate was 10% ...Web

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