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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  • Abstract
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  • Application Information

AI Technical Summary

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 solut

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

Experimental program
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Example Embodiment

[0022] Example 1

[0023] Vanadium (V 2 O 5 1.06%) of stone coal was added with 6% of CaO to be broken, and then calcined at 800 °C for 2 hours. The calcine was added to sulfuric acid solution at a solid-to-liquid ratio of 1:1.2 g / ml, leached at room temperature for 6 hours and filtered to obtain vanadium (V 2 O 5 6.42g / L) of the leaching solution was added with ammonia water to adjust the pH value to 0.5, and the ammonium aluminum sulfate NH was crystallized out. 4 Al(SO 4 ) 2 ·12H 2 O crystal, add NaHCO to the liquid after crystallization 3 Adjust the pH value to 2.0 to remove iron, to contain 0.21% V 2 O 5 The iron removal slag is then oxidized to 2.0 times of the chemical reaction stoichiometric number of V(V) in the liquid after iron removal, add hydrogen peroxide to oxidize at room temperature for 2h, use strong alkali resin 201×7 to absorb vanadium, contact time 40min, negative vanadium resin 4.0mol / L NH 3 The ammonia water was absorbed, the contact time was 6...

Example Embodiment

[0024] Example 2

[0025] Vanadium (V 2 O 5 1.17%) of the stone coal was crushed and then added concentrated sulfuric acid and mixed well, and then calcined at 250 ° C for 2 hours, and the calcined sand was added at a solid-to-liquid ratio of 1: 1.2 g / ml to the ion-exchange solution obtained in Example 1, leached at 85 ° C for 1.0 hours, and filtered to obtain Vanadium (V 2 O 5 7.23g / L) of the leaching solution, the leaching solution is NH 4 Al(SO 4 ) 2 ·12H 2 O crystals are precipitated by adding 2.0 times the stoichiometric number of the chemical reaction (NH 4 )SO 4 In addition to aluminum, add CaCO to the liquid after aluminum removal 3 Adjust the pH value to 1.9, according to Fe in the solution 2+ oxidized to Fe 3+ Add V(V) 1.0 times the number of chemical reactions, remove iron at 40°C for 1.5h and filter, the filter residue contains 0.05% V 2 O 5 , the filtrate is oxidized to 1.2 times the number of chemical reactions of V(V) according to the low-valent van...

Example Embodiment

[0026] Example 3

[0027] Vanadium (V 2 O 5 0.83%) of the stone coal is crushed and then added to the exchanged liquid obtained in Example 2 at a solid-to-liquid ratio of 1: 1.2 g / ml, and then added concentrated sulfuric acid and oxygen pressure leaching and filtration to obtain vanadium-containing (V 2 O 5 6.62g / L) of the leaching solution, the leaching solution is NH 4 Al(SO 4 ) 2 ·12H 2 1.5 times of the stoichiometric number of O crystals were added to the ammonium-containing transformation solution obtained in Example 2, and N was added. 4 HCO 3 Adjust pH to 2.5 to crystallize out NH 4 Al(SO 4 ) 2 ·12H 2 O crystal, according to Fe in the liquid after crystallization 2+ oxidized to Fe 3+ Add hydrogen peroxide to 1.1 times the number of chemical reactions, stir at room temperature for 1.0h to remove iron, and obtain a solution containing 0.13% V 2 O 5 After iron removal, the liquid is oxidized to ammonium persulfate 1.5 times the number of V(V) chemical reacti...

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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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