Molybdenum recovery from molybdenite concentrates by low …
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
اقرأ أكثرMolybdenum recovery from molybdenite concentrates by low …
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
اقرأ أكثرInvestigation of Molybdenite Concentrate Roasting in Chamber
Molybdenum xide 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
اقرأ أكثرInternational Journal of Engineering TECHNICAL
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
اقرأ أكثرSeparation of Rhenium from Lead-Rich Molybdenite …
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
اقرأ أكثرUS10969174B2
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 telpic lifting system, and/or wherein a distance x …Web
اقرأ أكثرMolybdenum recovery from molybdenite concentrates by low …
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
اقرأ أكثرTechnology of Molybdenum Ferroalloys
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
اقرأ أكثرTechnology of Molybdenum Ferroalloys
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
اقرأ أكثرDielectric Properties and Oxidation Roasting of Molybdenite …
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
اقرأ أكثرControl Of Air Pollution Emissions From Molybdenum Roasting
The plant processed 10 million pounds of molybdenum per year. In the roasting process, molybdenum disulfide concentrate was oxidized by air to molybdenum xide and sulfur dioxide. Particulate control was achieved by a baghouse, followed by a spray cooler and a packed bed scrubber. The scrubber water was recirculated with blow-down.Web
اقرأ أكثرHydrometallurgical Extraction of Molybdenum and Rhenium from …
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
اقرأ أكثرWO2017202909A1
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 telpic lifting system, and/or …Web
اقرأ أكثرMetallurgy of Ferromolybdenum | SpringerLink
Evaporation of MoO 3 increases in the presence of water vapor. At 690 °C and a water vapor pressure of 798 kPa, the vapor pressure of MoO 3 increases by about 4 times, since complex MoO 3 ·H 2 O molecules are formed. These properties of MoO 3 are associated with increased evaporation and possible losses of molybdenum oxides …Web
اقرأ أكثرCN203049004U
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
اقرأ أكثرRemoval Mechanism of Mineral Impurities in Molybdenum Concentrate
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
اقرأ أكثرThermodynamic Modelling of Molybdenite Roasting in a
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 xide. Thus, multiple-hearth roasting of molybdenite is the commercially pre-Web
اقرأ أكثرClean separation and purification for strategic metals of molybdenum
(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
اقرأ أكثرChemistry and Mechanism of Interaction Between …
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
اقرأ أكثرUS20190145707A1
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 telpic lifting system, and/or wherein a distance x …Web
اقرأ أكثرDielectric Properties and Oxidation Roasting of Molybdenite Concentrate
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
اقرأ أكثرCN108149006A
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
اقرأ أكثرMulti-hearth for molybdenum roasting
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
اقرأ أكثرA Novel Self-Heated Roasting Technology for Molybdenum …
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
اقرأ أكثرMultiple hearth roasting furnace placed in a …
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
اقرأ أكثرMolybdenum Processing
Large rotary rakes move the molybdenite concentrate to promote the chemical reaction. Desulfurization systems such as sulfuric acid plants or lime scrubbers remove sulfur dioxide from the effluent roaster gases. The resulting roasted molybdenite concentrate typically contains a minimum of 57% molybdenum, and less than 0.1% sulfur.Web
اقرأ أكثرRoasting 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
اقرأ أكثرUS4555387A
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
اقرأ أكثرEnergy Consumption and Greenhouse Gas Emissions During
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
اقرأ أكثر(PDF) Energy Consumption and Greenhouse Gas Emissions …
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
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