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Stone coal sodium roasting vanadium-extracting method

A technology of sodium roasting and stone coal, applied in the direction of vanadium oxide, process efficiency improvement, etc., can solve the problems of exchange capacity decrease, ion concentration increase, environmental pollution, etc., achieve low consumption, high metal recovery rate, process Applicable effect

Inactive Publication Date: 2008-07-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

NaVO 3 and NaCl, if the ion-exchanged liquid is returned to calcine leaching, it will cause Cl in the feed liquid - As the ion concentration increases, the exchange capacity of the resin for V decreases, which forces the ion-exchanged liquid to be discharged, resulting in environmental pollution

Method used

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  • Stone coal sodium roasting vanadium-extracting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 250g of sodium chloride to 5kg of stone coal ore, mix and grind to -120 mesh agglomerate, roast at 750°C for 2h, add water to leaching the calcined sand at a solid-to-liquid ratio of 1:2 for 1.5h, and use a nanofiltration membrane for the leaching solution (molecular weight cut-off 250) 2.1MPa intercepts vanadium, ammonium chloride is added to the retained solution to precipitate ammonium metavanadate according to 2.5 times the stoichiometric amount, ammonium metavanadate is pyrolyzed at 550°C for 2 hours to obtain the product vanadium pentoxide, and the vanadium precipitated mother liquor is deaminated and returned to the leaching process for nanofiltration The obtained permeate is desalted by electrodialysis, concentrated brine is used for stone coal agglomerates, and fresh water is returned to calcined sand for leaching. The experimental results (g / L) of stone coal sodium roasting, water leaching, nanofiltration concentration, vanadium extraction and electrodialys...

Embodiment 2

[0024] Add 200g of sodium chloride to 5kg of stone coal ore powder (-150 mesh), roast 2h at 800°C with concentrated brine agglomerates in Example 1, and add calcined sand at a solid-to-liquid ratio of 1:2 (fresh water+new water in Example 1 ) leaching for 1.5h, the leaching liquid was intercepted by nanofiltration membrane (molecular mass cut-off: 300) 1.9MPa, and ammonium chloride was added to the retentate liquid at 1.5 times the stoichiometric amount to precipitate ammonium metavanadate, and ammonium metavanadate was pyrolyzed at 530°C for 2 hours to obtain the product Vanadium pentoxide, vanadium precipitation mother liquor is deaminated and permeated liquid is combined into vanadium extraction liquid, vanadium extraction liquid is desalted by electrodialysis, concentrated brine is used for stone coal lump ore, and fresh water is returned to calcined sand for leaching. The experimental results (g / L) of stone coal sodium roasting, water leaching, nanofiltration concentration...

Embodiment 3

[0027] Add 150g of sodium chloride to 5kg of stone coal ore powder (-200 mesh), roast 2h at 760°C with the concentrated water agglomerate in Example 2, and add calcined sand at a solid-to-liquid ratio of 1:2 (fresh water+new water in Example 2 ) leaching for 1.5h, the leach solution is adsorbed vanadium with strong base anion resin (D231), and the negative vanadium resin is desorbed and regenerated with a mixed solution of sodium chloride and sodium hydroxide (NaCl1.2mol, NaOH 1.5mol), and the desorption solution is added by 3.0 times of stoichiometric Ammonium chloride sinks ammonium metavanadate, and ammonium metavanadate is pyrolyzed at 550°C for 2 hours to obtain vanadium pentoxide. After the vanadium precipitation mother liquid is deaminated, it is combined with the post-transaction liquid to form the liquid after vanadium extraction, and the liquid after vanadium extraction is desalted by electrodialysis , Concentrated brine is used for stone coal agglomerates, and fresh ...

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Abstract

The invention relates to a bone coal sodium roasting vanadium extraction process, which comprises levigating bone coal ore after evenly mixing with common salt, agglomerating ore to roast, calcining to leach through adding water, enriching leaching solution through filter membrane entrapment or anion exchange resin absorption, depositing ammonium metavanadate through adding vanadium-enriching solution, conducting ammonium metavanadate pyrolysis to obtain vanadium pentoxide product, desalting through electrodialysis after vanadium extraction, wherein concentrated water is used to bone coal agglomerate and fresh water is return for roasting and water leaching. The invention has the advantages of simple technology, small water and natrium chloratum agent consumption, high metal recovery, low productive cost and non waste water discharge and the like.

Description

technical field [0001] The invention relates to a method for extracting vanadium by sodium-roasting stone coal. Background technique [0002] Stone coal is an important vanadium-containing resource. The vanadium in stone coal is mainly low-priced vanadium that exists in mica in the form of homogeneous phase. To extract vanadium from stone coal, vanadium must be dissociated from the mica crystal phase. come out. There are many techniques for extracting vanadium from stone coal: oxidative roasting-alkali leaching, oxidative roasting-acid leaching, calcification roasting-ammonium bicarbonate leaching, sodium roasting-water leaching, etc. The sodium roasting-water leaching process has the highest vanadium extraction rate and Suitable for all types of stone coal mines. The traditional process of vanadium extraction by sodium roasting of stone coal is: sodium roasting of stone coal—water immersion—ion exchange—precipitation of vanadium by ammonium salt—thermal decomposition of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/24C22B34/22C01G31/02
CPCY02P10/20
Inventor 王学文张贵清王明玉肖连生李青刚
Owner CENT SOUTH UNIV
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