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  • Direct Acid Leaching of Vanadium from Stone Coal

    This paper focused on optimizing the process conditions of direct acid leaching process to enhance the leaching efficiency of leaching vanadium from the stone coal. Orthogonal experiments and single factor experiments were conducted to investigate the effect of the influential factors of direct acid leaching on vanadium leaching ratio. The results showed that the vanadium leaching ratio

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  • A new process of extracting vanadium from stone coal

     · A new process of extracting vanadium from the stone coal vanadium ore in Fangshankou Dunhuang area of Gansu Province China was introduced. Various leaching experiments were carried out and the results show that the vanadium ore in Fangshankou is difficult to process due to its high consumption of acid and the high leaching rate of impurities. However the leaching rate can be up to

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  • Roast Experiment Research of Vanadium Stone Coal MRS

    Experimental results indicate that for the vanadium stone coal from Hubei Province at the condition of additive dosage is 6 the ideal target of vanadium lixiviate efficiency 82.3 can be acquired in the optimum condition of roasting temperature at 850 oC roasting time is 120 minutes material size is minus 0.5mm.

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  • Extraction of vanadium from stone coal by modified salt

     · Extraction of vanadium from stone coal by modified salt-roasting process Extraction of vanadium from stone coal by modified salt-roasting process Wang Ming-yu Wang Xue-wen Shen Ji-feng Wu Ri-na 00 00 00 In order to reduce the pollution of Cl2 and HCl released during extracting vanadium from stone coal by sodium chloride roasting a modified salt-roasting process was proposed

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  • Blank roasting and bioleaching of stone coal for vanadium

     · Vanadium is an important rare element that is mainly used to produce certain alloys and vanadium batteries (Zhang et al. 2011). Stone coal is a unique vanadium-bearing resource in China and the gross reserve of vanadium in stone coal accounts for more than 87 wt of the domestic reserve of vanadium (Xie et al. 2019).

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  • Phase transformations of vanadium recovery from

    such as NaCl and CaO can also be effective for vanadium extraction from stone coal and remove Cl from fuel gas but their application has been con ned to a uidized bed roasting reactor.20 Recently our research group reported a novel BaCO 3/ CaO composite roasting additive and acid leaching technology for vanadium recovery from stone coal.

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  • Pre-concentration of vanadium from stone coal by gravity

     · The gross reserve of vanadium in terms of V2 O 5 in stone coal is 118 million tons which is 6.7 times more than that in vanadium–titanium magnetite accounting for more than 87 of the domestic reserve of vanadium (Bin 2006). Therefore the effective utilization of the stone coal is very important for the vanadium industry in China.

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  • Selective Leaching of Vanadium from Roasted Stone Coal

     · In China the gross reserve of vanadium in stone coal was 118 million tons in the terms of V2O5 1 2 . The vast amount of these deposits has made stone coal be of considerable interest as

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  • Oxidation Mechanism of Vanadium Extraction in Stone Coal

     · On this basis oxidation kinetics of vanadium is studied. The result shows that vanadium in the stone coal mainly occurs in illite the phase transition in roasting process results in the disappearance of vanadium-containing illite and the formation of soluble vanadate and orthoclase-albite vanadium oxidation is a staged process (V (Ⅲ)→V

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  • Study on Extracting Vanadium from Coal Vanadium Ore

    Coal vanadium ore from Hunan was pretreated by sulfuric acid for curing. Influences of curing time curing temperature sulphuric acid concentration and ore size fraction on vanadium leaching rate were investigated and discussed. Test results showed that -100 mesh ore size was cured by 20 added quantity of sulphuric acid at 180°C for 24h and was leached by agitation with tap water the

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  • Mechanisms of Vanadium Recovery from Stone Coal by

    In this report the vanadium recovery mechanisms by novel BaCO3/CaO composite additive roasting and acid leaching technology including the phase transformations and the vanadium leaching kinetics were studied. The purpose of this manuscript is to realize and improve the vanadium recovery from stone coal using BaCO3/CaO as the composite additive.

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  • Calcified roasting-acid leaching process of vanadium from

     · China the amount of V2O5 in vanadium-containing stone coal accounts for 87 of the total reserves (Zhang et al. 2011). However the amount of low-grade vanadium-containing stone coal accounts for over 60 of the total and the low-grade ore zone is

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  • PRE-CONCENTRATION OF VANADIUM-BEARING MICA

     · utilization of stone coal resources. Keywords roasting flotation vanadium bearing mica stone coal Introduction Vanadium is an important material used mostly in steel industry. Approximately 80 of world s vanadium is used in steel alloys and the other 20 in the chemical industry (Moskalyk and Alfantazi 2003). The gross reserve of V 2 O 5

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  • Calcified roasting-acid leaching process of vanadium

     · China the amount of V2O5 in vanadium-containing stone coal accounts for 87 of the total reserves (Zhang et al. 2011). However the amount of low-grade vanadium-containing stone coal accounts for over 60 of the total and the low-grade ore zone is

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  • Selective Leaching of Vanadium from Roasted Stone Coal by

    A novel staged leaching process has been reported in this paper to selectively extract vanadium from roasted stone coal and the mechanisms have been clarified. Results showed that the leaching efficiency of V Al P and Fe was 80.46 12.24 0.67 and 3.12 respectively under the optimum dilute sulfuric acid dephosphorization (DSAD)-two-stage pressure acid leaching (PAL) conditions.

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  • Improved extraction of vanadium from a Chinese

     · Vanadium is a rare metal mainly used in the steel industry. Vanadium‐bearing stone coal is an important source of vanadium in China. The common process used to extract vanadium from the stone coals is roast‐leach which has the disadvantages of low vanadium recovery and significant pollution.

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  • Extraction of Vanadium from Stone Coal by Microwave

     · The extraction of vanadium from stone coal was investigated by microwave-assisted sulfation roasting followed by water leaching. The results showed that this process is an effective method for the extraction of vanadium from stone coal. Microwave-assisted sulfation roasting promotes the reaction of sulfuric acid with vanadium oxides and decreases roasting time. Under optimized conditions

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  • Determination of Vanadium Valency in Roasted Stone Coal

    Determination of Vanadium Valency in Roasted Stone Coal by Separate Dissolve-Potentiometric Titration MethodVolume 1380. Skip to main content Accessibility help We use cookies to distinguish you from other users and to provide you with a better experience on our websites.

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  • Microwave roasting with size grading based on the

    roasting-acid leaching from stone coal was investigated. The relations of carbon content particle size microwave input power and vanadium leaching efficiency are analyzed and cor-responding suggestions for the microwave roasting of stone coal are proposed. 2 Experiment 2.1 Materials The vanadium-bearing stone coal used in this study was ob-

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  • Vanadium Transitions during Roasting-Leaching Process

     · Abstract The vanadium occurrence in stone coal water leaching and acid leaching residue was investigated by energy dispersive spectrometer (EDS) mapping and point analysis and the vanadium transitions during roasting-leaching of stone coal were revealed.

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  • Kinetics of Leaching Vanadium with Sulfuric Acid from

    ηA kinetic study of the leaching of stone coal ore with sulfuric acid has been investigated. The effects of the stirring speed particle sizes of stone coal acid concentration leaching temperature and acid-ore ratio on the leaching rate of vanadium were examined. It was found that the leaching rate of vanadium was significantly influenced by leaching temperature.

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  • Calcified roasting-acid leaching process of vanadium from

     · The low-grade vanadium-containing stone coal used in this experiment was collected from Wuxi Country Chongqing City China. The experiment focused on the vanadium recovery from roasted residue through optimizing the process conditions of an effective and environmentally-friendly technology named calcified roasting-sulfuric acid leaching technology. By single-factor experiments and

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  • Extraction of vanadium from stone coal by modified salt

     · In order to reduce the pollution of Cl2 and HCl released during extracting vanadium from stone coal by sodium chloride roasting a modified salt-roasting process was proposed by adding calcined lime in roasting process followed by H2SO4 leaching. The effects of parameters including roasting temperature roasting time addition mass ratio of NaCl calcined lime upon leaching rate of vanadium

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  • Extraction of vanadium from stone coal by roasting in a

     · Extraction of vanadium from stone coal by roasting in a fluidized bed reactor Xi Zenga Fang Wangb Huifeng Zhanga c Lijie Cuic Jian Yua ⇑ Guangwen Xua ⇑ a State Key Laboratory of Multi-Phase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China bSchool of Chemical and Environmental Engineering China University of Mining and

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  • Extraction of vanadium from stone coal by modified salt

     · In order to reduce the pollution of Cl2 and HCl released during extracting vanadium from stone coal by sodium chloride roasting a modified salt-roasting process was proposed by adding calcined lime in roasting process followed by H2SO4 leaching. The effects of parameters including roasting temperature roasting time addition mass ratio of NaCl calcined lime upon leaching rate of vanadium

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  • Effect of K SO on solvent extraction of vanadium with 2 4

     · The stone coal is an im-portant vanadium-bearing resource which is widely distributed in many provinces of China2 3. In stone coal the vanadium exists mostly as trivalent vana-dium (V(III)) tetravalent and pentavalent vana-dium are very scarce4–7. V(III) replaces Al(III) isomorphically in muscovite lattice which means that vanadium in

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  • Calcified roasting-acid leaching process of vanadium

     · China the amount of V2O5 in vanadium-containing stone coal accounts for 87 of the total reserves (Zhang et al. 2011). However the amount of low-grade vanadium-containing stone coal accounts for over 60 of the total and the low-grade ore zone is often mixed in the high-grade ore (Wei et al. 2010).

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  • Study on Extracting Vanadium from Coal Vanadium Ore

    Coal vanadium ore from Hunan was pretreated by sulfuric acid for curing. Influences of curing time curing temperature sulphuric acid concentration and ore size fraction on vanadium leaching rate were investigated and discussed. Test results showed that -100 mesh ore size was cured by 20 added quantity of sulphuric acid at 180°C for 24h and was leached by agitation with tap water the

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  • from Stone Coal by Roasting with MgOMDPI

     · medicine vanadium redox batteries and so on 1 2 . Stone coal is a particular vanadium ore resource in China and its gross reserves of vanadium account for more than 87 of the domestic reserves of vanadium 3–5 . Therefore extracting vanadium from stone coal is an important way to obtain vanadium pentoxide.

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  • Oxidation Mechanism of Vanadium Extraction in Stone

     · On this basis oxidation kinetics of vanadium is studied. The result shows that vanadium in the stone coal mainly occurs in illite the phase transition in roasting process results in the disappearance of vanadium-containing illite and the formation of soluble vanadate and orthoclase-albite vanadium oxidation is a staged process (V (Ⅲ)→V

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  • Extraction of Vanadium from Stone Coal by Microwave

    The extraction of vanadium from stone coal was investigated by microwave-assisted sulfation roasting followed by water leaching. The results showed that this process is an effective method for the extraction of vanadium from stone coal. Microwave-assisted sulfation roasting promotes the reaction of sulfuric acid with vanadium oxides and decreases roasting time.

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  • (PDF) Leaching of vanadium from stone coal with sulfuric acid

    The results show that the vanadium leaching ratio of roasted stone coal through two-stage counter-current leaching can reach 65.1 at the mass ratio of H2SO4 to stone coal of 20 leaching

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  • The technology of extracting vanadium from stone coal in

     · Stone coal is widely distributed in southern provinces and autonomous region of China and Shanxi province. It is reported that the gross reserves of stone coal in these districts are estimated at 61.88 billion tons ().Vanadium is commonly founded in stone coal and the gross reserves of vanadium is 118 million tons in the terms of V 2 O 5 () accounting for more than 87 of the domestic

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  • Selective Leaching of Vanadium from Roasted Stone Coal

     · Keywords pressure acid leaching stone coal thermodynamics vanadium selective leaching 1. Introduction In China the gross reserve of vanadium in stone coal was 118 million tons in the terms of V2O5 1 2 . The vast amount of these deposits has made stone coal be of considerable interest as a vanadium source.

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  • Roast Experiment Research of Vanadium Stone Coal MRS

    Experimental results indicate that for the vanadium stone coal from Hubei Province at the condition of additive dosage is 6 the ideal target of vanadium lixiviate efficiency 82.3 can be acquired in the optimum condition of roasting temperature at 850 oC roasting

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  • Extraction of vanadium from stone coal by modified salt

     · Extraction of vanadium from stone coal by modified salt-roasting process Extraction of vanadium from stone coal by modified salt-roasting process Wang Ming-yu Wang Xue-wen Shen Ji-feng Wu Ri-na 00 00 00 In order to reduce the pollution of Cl2 and HCl released during extracting vanadium from stone coal by sodium chloride roasting a modified salt-roasting process

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  • A new process of extracting vanadium from stone coal

     · A new process of extracting vanadium from the stone coal vanadium ore in Fangshankou Dunhuang area of Gansu Province China was introduced. Various leaching experiments were carried out and the results show that the vanadium ore in Fangshankou is difficult to process due to its high consumption of acid and the high leaching rate of impurities. However the leaching rate can be up to

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  • Leaching of vanadium from stone coal with sulfuric acid

     · The results show that the vanadium leaching ratio of roasted stone coal through two-stage counter-current leaching can reach 65.1 at the mass ratio of H 2 SO 4 to stone coal of 20 leaching temperature of 95°C leaching time of 30 h liquid-to-solid ratio of 1.1 mL·g −1 and grinding fineness of 0.1 mm which can serve as an experimental

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  • Extraction of Vanadium from Stone Coal by Microwave

    The extraction of vanadium from stone coal was investigated by microwave-assisted sulfation roasting followed by water leaching. The results showed that this process is an effective method for the extraction of vanadium from stone coal. Microwave-assisted sulfation roasting promotes the reaction of sulfuric acid with vanadium oxides and decreases roasting time.

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  • Leaching of vanadium from stone coal with sulfuric acid

     · The effects of roasting mass ratio of H 2 SO 4 to stone coal leaching temperature liquid-to-solid ratio grinding fineness of stone coal and two-stage counter-current leaching on the vanadium leaching ratio were studied. The results show that the vanadium leaching ratio of roasted stone coal through two-stage counter-current leaching can reach 65.1 at the mass ratio of H 2 SO 4 to stone

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  • Separation and recovery of vanadium from a sulfuric-acid

     · Acidic vanadium leaching solution was prepared by roasting stone coal at 850 °C for 1 h followed by leaching with 15 (v/v) H 2 SO 4 and 0.8 (wt) NaClO 3 (used as oxidant) at 95 °C and 6 h. The composition of this solution is listed in Table 1 and the pH value of the solution was around 0.4.

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  • Leaching of vanadium from stone coal with sulfuric acid

    Wang M.Y. et al. Leaching of vanadium from stone coal with sulfuric acid 3 ing ratio increases with an increase in mass ratio of H2SO4 to stone coal. 3.2. Effects of leaching temperature and time

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