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Method for extracting vanadium by stone coal through acid leaching

A technology of stone coal acid and stone coal, which is applied in the field of vanadium extraction from stone coal acid leaching, can solve the problems of difficult extraction phase separation, high solution viscosity, and large reagent consumption, and achieve high comprehensive utilization of resources, high grade, and high processing efficiency. low cost effect

Inactive Publication Date: 2009-12-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, the leaching solution is reduced and extracted first, and then back-extracted and oxidized. The process is long, the consumption of reagents is large, and the production cost is high. Moreover, if the solution is recycled after vanadium extraction, a large amount of sulfate will accumulate, the viscosity of the solution will be high, and the extraction and phase separation will be difficult. , direct discharge of large environmental pollution

Method used

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  • Method for extracting vanadium by stone coal through acid leaching

Examples

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Effect test

Embodiment 1

[0023] 2500g contains vanadium (V 2 o 5 ) 1.08% stone coal is crushed and then stirred with water at a solid-to-liquid ratio of 1: 1.2g / ml, then added 270ml of concentrated sulfuric acid at 95°C for leaching for 36 hours and filtered to obtain vanadium-containing (V 2 o 5 ) 3000ml of leaching solution of 6.12g / L, add ammonia water to the leaching solution 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, after crystallization, add NaOH to the liquid to neutralize until the pH value reaches 4.5, precipitate and precipitate vanadium-containing slag and filter, and the vanadium-precipitated slag is formed according to the formation of NaVO 3 Add NaCl and Na to twice the stoichiometric number of roasting reactions 2 CO 3 Mix the mixture with a molar ratio of 1:1, mix well and roast at 800°C for 1.5 hours, add water to the calcined sand at a solid-to-liquid ratio of 1:2g / ml and stir at 80°C for 1 hour, ad...

Embodiment 2

[0025] 2500g contains vanadium (V 2 o 5 ) 1.08% stone coal is crushed and then added 270ml of concentrated sulfuric acid and mixed thoroughly and roasted at 250°C for 2 hours, and the calcined sand is added in Example 1 at a solid-to-liquid ratio of 1: 1.2g / ml to neutralize the vanadium-precipitated liquid at 95°C for 1.5 hours and filter. Get vanadium (V 2 o 5 ) 6.79g / L leach solution 3100ml, the leach solution is NH 4 Al(SO 4 ) 2 12H 2 Adding 1.5 times the stoichiometric number of O crystal precipitation (NH 4 ) SO 4 , to remove aluminum by crystallization, and add CaCO to the liquid after crystallization 3 Neutralize until the pH value reaches 2.5 and filter, add hydrogen peroxide to the filtrate to oxidize and precipitate, and filter the vanadium residue according to the formation of NaVO 3 NaOH was added to twice the stoichiometric number, the solid-to-liquid ratio was 1:2g / ml, stirred and leached at 80°C for 2.0 hours, and NH was added to the leach solution at 1...

Embodiment 3

[0027] 1000g contains vanadium (V 2 o 5 ) 1.08% of the stone coal is crushed and press solid-liquid ratio 1: 1.2g / ml embodiment 2 to neutralize the liquid after vanadium precipitation, add 110ml concentrated sulfuric acid oxygen pressure 165 ℃ of leaching for 3 hours and filter again, obtain vanadium-containing (V 2 o 5 ) 8.61g / L leachate 985ml, the leachate adds NaOH and the NH that embodiment 2 obtains 4 Al(SO 4 ) 2 12H 2 After the transformation of O, the pH value of the liquid is adjusted to 1.5, and aluminum ammonium sulfate NH is crystallized. 4 Al(SO 4 ) 2 12H 2 O crystal, add Na to the liquid after crystallization 2 CO 3 Neutralize until the pH value reaches 3.5, blow air, oxidize, precipitate, precipitate vanadium-containing slag, filter, and form NaVO 3 Add Na to 1.5 times the stoichiometric number of roasting reactions 2 CO 3 After mixing well, roast at 750°C for 3 hours, add water to the calcined sand at a solid-to-liquid ratio of 1:3g / ml and stir at 3...

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Abstract

The invention discloses a method for extracting vanadium by stone coal through acid leaching, which mainly comprises process steps of: crystallizing vanadium ammonium aluminum sulfate by stone coal acid leaching solution; performing neutralization or oxidation neutralization on a liquid after the crystallization to precipitate the vanadium; performing water leaching on vanadium precipitation residue after the alkaline leaching or the roasting by sodium salt; performing vanadium precipitation by ammonium salt on vanadium leaching solution; pyrolyzing ammonium metavanadate; transforming the vanadium ammonium aluminum sulfate and the like. The method has the advantages of less reagent consumption, low production cost, good product quality, high comprehensive utilization rate of resources, less produced waste, environmental protection and the like.

Description

technical field [0001] The invention relates to a method for extracting vanadium by acid leaching of stone coal. Background technique [0002] Stone coal is an important mineral resource for vanadium metallurgy, and it is used as raw material to produce 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. Since acid gases such as HCl are produced during the roasting process and cause great environmental pollution, the process of vanadium extraction by sodium chloride roasting of stone coal is prohibited in many places. Although the alkaline leaching of vanadium from stone coal does not produce HCl and other acidic gases to pollute the environment, a large amount of silicon enters the solution during the alkaline leaching process, and the separation of silicon and vanadium in the leaching solution needs further research. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C22B3/22C22B3/14C22B3/04
CPCY02P10/20
Inventor 王学文王明玉
Owner CENT SOUTH UNIV
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