Process for preparing vanadium pentoxide from ash composition

A technology for ash content and vanadium compounds is applied in the field of preparing vanadium pentoxide and can solve the problems of co-precipitation of vanadium compounds, low conversion rate of iron ions and the like

Inactive Publication Date: 2011-11-23
GREENSHORES PATENT
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is also a problem that co-precipitation of some vanadium compounds will occur when iron is separated, and the conversion rate of ferrous ions into ferric ions is low

Method used

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  • Process for preparing vanadium pentoxide from ash composition
  • Process for preparing vanadium pentoxide from ash composition
  • Process for preparing vanadium pentoxide from ash composition

Examples

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Embodiment 1

[0038] 100 kg of ash composition having the following characteristics were treated with the method of the present invention. Fluorescence spectroscopy (XRF) was used to analyze, and various elements in the ash were expressed in the form of oxides, as listed in Table 1.

[0039] The material contained in the ash composition of table 1 and its weight ratio

[0040]

[0041] Detailed phase analysis using X-ray diffraction (XRD) can also be applied in fly ash. The analysis found that vanadium mainly exists in the following phases: vanadyl sulfate hydrate (VOSO 4 *3H 2 O), vanadium ocher (V 2 o 5 ), vanadyl sulfate hydrate (VOSO 4 *2H 2 O), magnesium pyrovanadate (Mg 2 V 2 o 7 ), sodium vanadium oxide (NaV 3 o 8 ), magnesium orthovanadate (Mg2VO4) and vanadium oxide (V 4 o 9 ).

[0042] First, the ash composition was treated with a first solution having a pH value of 7 in a stirred tank reactor at a temperature of 80° C. for 2 hours. The solids content in the solu...

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Abstract

The present invention is directed to a process for preparing vanadium pentoxide from an ash composition comprising solid ash particles, vanadium, iron and nickel compounds optionally present in an aqueous solution. The process comprises the following steps: (i) leaching the ash composition by contacting the ash composition with an acid aqueous solution at a pH of below 1, (ii) adding a reducing agent to the aqueous solution, (iii) contacting the aqueous solution obtained in step (ii) with an ion exchange resin in its H + ionic form, (iv) desorption of the vanadium compounds from the ion exchange resin rich in vanadium compounds by contacting the ion exchange resin with an aqueous solution of H 2 SO 4 to obtain an aqueous solution rich in vanadium compounds, and (v) converting and isolating the vanadium compounds as present in the aqueous solution to vanadium pentoxide.

Description

technical field [0001] The present invention relates to a process for the preparation of vanadium pentoxide obtained from an ash composition containing solid ash particles and alum, iron and nickel compounds, optionally also in an aqueous solution. Background technique [0002] US Patent No. 4,637,920A discloses a method for preparing vanadium pentoxide. The invention discloses a method for recovering vanadium and nickel from roasting dust and ash, which uses sulfuric acid leaching and then purifies the leachate to recover nickel and vanadium. Ammonia gas is passed through the resulting leach liquor to raise the pH to about 1, contact with scrap iron, and then more ammonia gas is passed to raise the pH to 5.8 to 5.9. Vanadium is precipitated as ammonium polyvanadate. The resulting vanadium-containing precipitate is roasted to obtain vanadium pentoxide. Raise raffinate pH to 10 to 10.5 to remove iron, add hydrogen peroxide to convert all iron to trivalent and form Fe(OH) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02B09B3/00
CPCC01G49/0009C22B34/225C22B3/42C22B7/04C01G53/00C22B34/22C22B7/007C01G31/02C01G31/003C01G9/00Y02P10/20
Inventor 西里尔罗杰·曼伯特
Owner GREENSHORES PATENT
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