(PDF) Extracting Vanadium from Stone Coal by a Cyclic ...

Jan 03, 2017· After mechanical crushing, the raw ores with an ... Vanadium in stone coal is hard to be leached and the leaching rate is less than 10% when the raw ore is leached by 4 mol/L H2SO4 at 90°C for 2 ...

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The advantage is that a simple crushing, screening and grinding operation followed by magnetic separation can produce a vanadium bearing magnetite concentrate. These concentrates rarely exceed 2.5% vanadium pentoxide, but for operations wanting a simple mineral processing operation, these concentrates are saleable.

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grade of stone coal is improved from 0.7% to 0.8%, the cost of producing 1 t of V 2 O 5 will increase profits by 29% (Ning et al., 2010, Zhao et al., 2013). Hence, the vanadium pre-concentration of stone coal may improve vanadium recovery and reduce production costs. Furthermore, the vanadium pre-

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Vanadium, known as the "industrial monosodium glutamate", is an important strategic material which has found wide applications (Bert et al., 2003). In 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

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Repeated screening for subjective symptoms and thorough clinical .... the first series of d-block transition elements which also contains titanium, vanadium, ..... of airborne dust particles at a crushing and screening plant were smaller than 5 µm. ... the manganese contents of …

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Jan 03, 2017· Vanadium, as a strategic metal, has been attractive for a variety of applications, including iron industry, catalysis, flow batteries.[1,2,3] It was reported that the reserve of vanadium (V 2 O 5 as the unit) in stone coal is more than 117.97 million tons in China.[] With such large reserves, extracting vanadium from stone coal has obtained great consideration in recent decades.

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Stone coal was first crushed by a jaw crusher, and then crushed to 0–3 mm using a roll crusher. The main chemical composition of the ore analysis results are shown in Table 1 . Table 1 shows that V 2 O 5 content in the ore is 0.77%, belonging to low-grade vanadium stone coal.

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In China, stone coal is a vanadium resource with huge reserves. The gross reserve of vanadium in terms of V 2 O 5 in stone coal is 118 million tons, which accounts for more than 87% of the domestic reserve of vanadium [1,2].Therefore, many techniques of vanadium extraction from stone coal have been researched and developed by various researchers [3,4].

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The present invention provides a method for extracting vanadium pentoxide from stone coal vanadium ore, which comprises five procedures of calcining for calcification, extracting in diluted acid, purifying vanadium solution, ion exchange and pyrogenation for removing ammonia. The method has the characteristics of low waste gas pollution, high yield of vanadium, low consumption, low energy ...

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The results show that after a roasting treatment at the optimum condition of 950 at 1 h, 76.88% vanadium can be leached under the experimental condition of 0.45% for 1 h with a liquid-to-solid ratio of 2 mL/g. Leaching after an oxidation roasting treatment is an efficient way to of H2SO4, …

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Various kinds of vanadium (V) ore mining areas produced serious contamination have been widely recognized, while less relevant research was about the associated health risk and V distribution level for farmland soils around. This study assessed the contamination characteristics and associated human …

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Stone coal is an important vanadium resource, which is widely distributed in several provinces of China. Most of the vanadium in stone coal exists as V(III) (trivalent vanadium), which substi-tutes for Al3+ in the dioctahedron of mica group minerals as isomorphism.1–4 The traditional technology for vanadium

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The present invention discloses a leaching process for extracting vanadium from calciners of ore containing vanadium and its application in bone coal blank calcination-direct leaching vanadium-extracting process. It is mainly characterized by that the broken bone coal is calcined in vertical kiln, under the condition of 800-1100 deg.C oxidated and decarbonized, then the calciners are ...