Novel process for preparing vanadic anhydride from firing residue of vanadium-containing stone coal

A technology of vanadium pentoxide and a new process is applied in the field of preparing vanadium pentoxide, which can solve the problems of high impurity content in leaching liquid, high production cost, large consumption of sulfuric acid, etc., so as to accelerate the leaching speed and improve the recovery rate. , the effect of saving energy

Inactive Publication Date: 2008-10-22
杨秋良
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For the extraction of vanadium pentoxide from the slag of vanadium-containing stone coal calcification roasting or blank oxidation roasting, the existing processes are generally dilute sulfuric acid normal temperature heap leaching or tank leaching and stirring leaching recovery process at normal temperature. These processes use dilute sulfuric acid leaching , poor selectivity, large consumption of sulfuric acid, high impurity content in the leaching solution, need to adjust alkali, resin ion exchange or solvent extraction PH value needs to be adjusted to 2-2.5, high production cost; leaching solution and tail water are acidic and contain A large number of heavy metal ions have certain environmental hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Material selection and filling: select vanadium-containing stone coal slag roasted at 850°C for 48 hours, the slag grade is 1.448%, the acid-soluble vanadium sample is 12.02kg / T, the alkali-soluble vanadium sample is 12.02kg / T, the conversion rate 89.01%, without crushing, without ball milling, directly filled in the cement leaching tank with movable door (volume is 1500m 3 );

[0031] 2. Leaching: take vanadium-containing stone coal slag and 10% soda ash solution to leaching at room temperature for 5 days at a solid-to-liquid ratio of 1:1. The leaching solutions are combined, the average vanadium hydrate grade is 4.98g / L, and the pH value is 7.5;

[0032] 3. Ion exchange and elution of vanadium pentoxide: The resin selected for adsorption is D301, which is a macroporous weakly basic anion resin produced by Henan Hebi Resin Factory, with an adsorption capacity of 348kg / T vanadium pentoxide.

[0033] The leaching solution flows up and down through the Φ0.8×2mm resin...

Embodiment 2

[0038] The vanadium-containing stone coal slag was leached with 8% (mass percentage concentration) soda ash solution at 80°C (the waste heat of vanadium-containing stone coal roasting) for 4 hours (the volume of the leaching tank was 2000m 3 ), its leaching recovery rate reaches 83%, and all the other are with embodiment 1 (wherein the slag containing vanadium-containing stone coal refers to the slag of 72 hours at 750 ℃ ​​of insulation roastings).

Embodiment 3

[0040]The vanadium-containing stone coal slag was leached with 5% (mass percentage concentration) soda ash solution at 80°C (the waste heat of vanadium-containing stone coal roasting) for 4 hours (the volume of the leaching tank was 500m 3 ), heated to 100° C. and leached for 2 hours with steam, and its leached recovery rate reached 85%, and all the other were the same as in Example 1 (wherein the vanadium-containing stone coal slag refers to the slag that was roasted at 1050° C. for 8 hours) .

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Abstract

The invention relates to a novel technology for preparing vanadium pentoxide by using stone coal ignited residue containing scherbinaite, which comprises the following steps: the stone coal ignited residue containing scherbinaite is directly filled in a cement leaching tank without being smashed or ball-milled, and then leached by a dilute sodium carbonate solution at normal temperature or by heating at the temperature of 60 DEG C to 100 DEG C; the obtained leach solution is adsorbed by resin and desorbed by saturated sodium chloride; the desorbed solution is dephosphorized and then added with ammonium chloride to precipitate vanadium, so as to obtain ammonium metavanadate, and the ammonium metavanadate is pyrolyzed to obtain the vanadium pentoxide. The invention has the advantages that (1) the nubbly stone coal ignited residue containing the scherbinaite is directly filled in the cement leaching tank for leaching so that the investment of fixed assets is saved and the problem of dust pollution in workshop is solved; (2) energy is saved by utilizing the waste heat of a roasting furnace for heating the leach solution, the leaching speed is quickened, the recovery rate is improved and the grade of vanadium contained in the leach solution is enriched; (3) by adopting the dilute sodium carbonate solution to substitute sulphuric acid for warming leaching, per ton of fine vanadium consumes approximately 2 tons of sodium carbonate only, therefore, production cost is saved compared with leaching per ton by sulphuric acid; (4) the water used for working can be recycled, thus realizing zero release; the leach residue is slightly alkaline and meets the national placement standards of general wastes.

Description

technical field [0001] The invention relates to the rare non-ferrous metal hydrometallurgy industry, in particular to a new process for preparing vanadium pentoxide by leaching vanadium-containing stone coal slag with dilute soda ash solution. Background technique [0002] For the extraction of vanadium pentoxide from the slag of vanadium-containing stone coal calcification roasting or blank oxidation roasting, the existing processes are generally dilute sulfuric acid normal temperature heap leaching or tank leaching and stirring leaching recovery process at normal temperature. These processes use dilute sulfuric acid leaching , poor selectivity, large consumption of sulfuric acid, high impurity content in the leaching solution, need to adjust alkali, resin ion exchange or solvent extraction PH value needs to be adjusted to 2-2.5, high production cost; leaching solution and tail water are acidic and contain A large number of heavy metal ions have certain environmental hazard...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02
CPCY02P20/10Y02P20/129
Inventor 杨秋良
Owner 杨秋良
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