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Process for extracting vanadium by acid leaching of stone coal

A stone coal acid and leaching technology, which is applied in the direction of improving process efficiency, can solve the problems of affecting vanadium recovery rate, high production cost, and large reagent consumption, so as to achieve low vanadium loss, good product quality, and low reagent consumption. little effect

Inactive Publication Date: 2010-06-30
CENT SOUTH UNIV
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Problems solved by technology

Although vanadium contains part of V (V) in the solution obtained from stone coal calcification and roasting-acid leaching, the vanadium in it can be recovered by ion exchange in theory, but a large amount of vanadium will be formed during the pH adjustment process of stone coal calcification and roasting Precipitation seriously affects the recovery rate of vanadium. Therefore, the solution obtained by acid leaching in the industrial production process of stone coal calcification and roasting also has to reduce V(V) to V(III), and then separate and recover the vanadium in it by extraction.
The extraction of vanadium by solvent extraction of stone coal acid leaching solution has the disadvantages of long process flow, large consumption of reagents, and high production cost.

Method used

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  • Process for extracting vanadium by acid leaching of stone coal
  • Process for extracting vanadium by acid leaching of stone coal

Examples

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Embodiment 1

[0023] Vanadium (V 2 o 5 1.06%) stone coal was broken by adding 6% CaO and then roasted at 800°C for 2h. The calcined sand was leached with sulfuric acid solution at room temperature for 6 hours at a solid-to-liquid ratio of 1:1.2g / ml and filtered to obtain vanadium-containing (V 2 o 5 6.42g / L) of the leaching solution, add ammonia water to adjust the pH value to 0.5, crystallize and separate out aluminum ammonium sulfate NH 4 Al(SO 4 ) 2 12H 2 O crystals, add NaHCO to the solution after crystallization 3 Adjust the pH value to 2.0 to remove iron and get 0.21% V 2 o 5 The iron removal slag is oxidized to 2.0 times of the stoichiometric number of V(V) after the iron removal, and the hydrogen peroxide is oxidized at room temperature for 2 hours, and the vanadium is adsorbed with a strong alkali resin 201×7, and the contact time is 40 minutes. The negative vanadium resin is used 4.0mol / L NH 3 ammonia solution desorption, contact time 60min, with 2.0mol / L H 2 SO 4Dilute...

Embodiment 2

[0025] Vanadium (V 2 o 5 1.17%) stone coal was crushed, added concentrated sulfuric acid and mixed thoroughly, then roasted at 250°C for 2 hours, added the ion-exchanged liquid obtained in Example 1 to the calcined sand at a solid-to-liquid ratio of 1: 1.2g / ml, leached at 85°C for 1.0 hour, and filtered to obtain Vanadium (V 2 o 5 7.23g / L) leachate, the leachate is NH 4 Al(SO 4 ) 2 12H 2 Adding 2.0 times the stoichiometric number of O crystal precipitation (NH 4 ) SO 4 Aluminum removal, adding CaCO to liquid after aluminum removal 3 Adjust the pH value to 1.9, according to the Fe in the solution 2+ Oxidized to Fe 3+ Add V (V) to 1.0 times the stoichiometric number, remove iron at 40°C for 1.5 hours and filter, the filter residue contains 0.05% V 2 o 5 , the filtrate is oxidized to 1.2 times the stoichiometric number of V (V) by low-valent vanadium, and then oxidized with sodium chlorate at 70°C for 1.5h. mol / L NaOH solution desorption, contact time 40min, then use...

Embodiment 3

[0027] Vanadium (V 2 o 5 0.83%) stone coal is crushed and presses solid-liquid ratio 1: 1.2g / ml adds the liquid after the exchange that embodiment 2 obtains, then adds concentrated sulfuric acid oxygen pressure leaching filtration and obtains vanadium-containing (V 2 o 5 6.62g / L) leachate, the leachate is NH 4 Al(SO 4 ) 2 12H 2 1.5 times of the stoichiometric number of O crystals are separated out, add the ammonium-containing liquid after conversion that embodiment 2 obtains, and add N 4 HCO 3 Adjust the pH value to 2.5 to crystallize NH 4 Al(SO 4 ) 2 12H 2 O crystal, according to Fe in liquid after crystallization 2+ Oxidized to Fe 3+ Add hydrogen peroxide to 1.1 times the stoichiometric number, stir at room temperature for 1.0 h to remove iron, and get 0.13% V 2 o 5 Iron removal slag, after iron removal, the liquid is oxidized to 1.5 times of V (V) stoichiometric number of ammonium persulfate at 85°C for 0.5h, and the vanadium is adsorbed with strong base anion...

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Abstract

The invention provides a process for extracting vanadium by acid leaching of stone coal. The process mainly comprises the following steps of: removing aluminum from crystal aluminum sulfate ammonium vanadium obtained from acid leaching solution of stone coal, performing selective oxidation and adjustment of a pH value of the solution obtained after the aluminum removal to remove iron, performing oxidizing transformation of vanadium in the solution obtained after the iron removal, adsorbing the vanadium in the transformed solution by anion exchange resin, desorbing and regenerating the vanadium-loaded resin, performing ammonium salt precipitation of the vanadium-desorbing solution, performing pyrolysis of ammonium metavanadate, transforming the aluminum sulfate ammonium vanadium and the like. The process has the advantages of short flow, little consumption of reagent, high vanadium recovery rate, low production cost, good product quality and the like.

Description

technical field [0001] The invention relates to a process for extracting vanadium by acid leaching of stone coal. Background technique [0002] Stone coal is a complex refractory mineral raw material containing vanadium, iron, aluminum and other multi-metals, and is currently mainly used for the production of vanadium pentoxide. Production of refined vanadium (V 2 o 5 ) process can be divided into acid leaching, alkali leaching and sodium chloride roasting. Sodium chloride roasting is a traditional process for extracting vanadium from stone coal, because the roasting process produces HCl, Cl 2 and other harmful gases, the environmental pollution is serious, and many places prohibit the use of stone coal sodium roasting to extract vanadium. Alkaline leaching of vanadium from stone coal does not produce acidic gases such as HCl, but a large amount of silicon enters the solution during the alkaline leaching process, and the separation and recycling of silicon in the leachin...

Claims

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Application Information

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IPC IPC(8): C22B34/22C22B3/08C22B3/42C22B3/24
CPCY02P10/20
Inventor 王学文王明玉
Owner CENT SOUTH UNIV
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