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Method of preparing high-purity vanadium pentoxide from roasting-method vanadium solution

A technology of vanadium pentoxide and solution, applied in vanadium oxide and other directions, can solve problems such as inability to separate

Active Publication Date: 2014-05-14
贵州义信矿业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former two kinds of substances mostly have a few molecules or tens of molecules in the vanadium solution (nH 2 SiO 3 , mH 4 SiO 4 , LNa 2 SiO 3 , Fe(OH) 3 · nH 2 O, etc.) gather together and exist in the vanadium solution in the form of tiny particles, which will not settle for a long time. These tiny particles cannot be separated by ordinary filtration methods. Phosphorus is also an impurity that is difficult to purify and remove.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1 of the present invention: the method for producing high-purity vanadium pentoxide by roasting method vanadium solution, gets 10 liters of desorption solution, contains V 2 o 5 15g / L, containing SiO 2 1.5g / L, containing Fe 2 o 3 0.7 g / L, phosphorus 1g / L, its pH value is 10, weigh 12 grams of polyaluminium, MgCl 2 40g, dissolve in 1 liter of water, heat the vanadium solution to 40°C, add purifying agent polyaluminum and MgCl under stirring 2 solution, stirred for 30 minutes, settled statically at room temperature for 70 hours, filtered, and the filtrate contained SiO 2 0.008 g / L, containing Fe 2 o 3 0.006g / L, containing 0.0015 g / L phosphorus, plus NH 4 Cl solution (containing NH 4 Cl202.5 g), precipitate vanadium, filter, wash the filter cake and calcined to obtain powdery V 2 o 5 146 grams. Check its composition, including SiO 2 0.065%, containing Fe 2 o 3 0.006%, containing 0.005% phosphorus, the content of silicon, iron and phosphorus in the ...

Embodiment 2

[0011] Embodiment 2 of the present invention: the method for producing high-purity vanadium pentoxide by roasting method vanadium solution, gets 10 liters of desorption solution, contains V 2 o 5 30g / L, containing SiO 2 0.8g / L, containing Fe 2 o 3 0.5g / L, containing 0.6g / L phosphorus, and its pH value is 8.5; weigh 20 grams of polyaluminium, MgCl 2 36 grams, dissolved in 1 liter of water, heating the vanadium solution to 50 ° C, adding the purifying agent polyaluminum and MgCl under stirring 2 solution, stirred for 20 minutes, settled at room temperature for 72 hours, and filtered; the filtrate contained SiO 2 0.002g / L, containing phosphorus 0.0002g / L, containing Fe 2 o 3 0.002g / L, add NH 4 Cl solution (containing NH 4 Cl405g), precipitate vanadium, filter, wash the filter cake and calcined to obtain powdery V 2 o 5 291.8 grams. Check its composition, including SiO 2 0.0075%, containing Fe 2 o 3 0.004%, containing 0.0028% phosphorus, the contents of silicon, iron...

Embodiment 3

[0012] Embodiment 3 of the present invention: the method for producing high-purity vanadium pentoxide by roasting method vanadium solution, gets 10 liters of desorption solution, contains V 2 o 5 55g / L, containing SiO 2 0.75g / L, containing Fe 2 o 3 0.6g / L, containing 0.2g / L phosphorus, and its pH value is 5; weigh 37 grams of polyaluminium, MgCl 2 15 grams, dissolved in 1 liter of water, heating the vanadium solution to 60 ° C, adding the purification agent polyaluminum and MgCl under stirring 2 solution, stirred for 15 minutes, settled at room temperature for 73 hours, and filtered; the filtrate contained SiO 2 0.0003g / L, containing Fe 2 o 3 0.0001g / L, containing 0.0001g / L phosphorus, plus NH 4 Cl solution (containing NH 4 Cl743 g), precipitate vanadium, filter, wash the filter cake and calcined to obtain powder V 2 o 5 534 grams. Check its composition, including SiO 2 0.002%, containing Fe 2 o 3 0.0003%, containing 0.0001% phosphorus, the content of silicon, ir...

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Abstract

The invention discloses a method of preparing high-purity vanadium pentoxide from roasting-method vanadium solution. The method comprises the following steps: adding a purifying agent into the roasting-method vanadium solution, wherein the purifying agent is polyaluminium chloride, magnesium chloride or calcium chloride, or the purifying agent is polyaluminium chloride and magnesium chloride, or polyaluminium chloride and calcium chloride; uniformly stirring the roasting-method vanadium solution containing the purifying agent, standing for settling, then filtering, and adding ammonium salt into the filtrate to precipitate vanadium; and finally, calcining meta-ammonium and deaminizing to prepare vanadium pentoxide with the purity being higher than 99.5%. Polyaluminium chloride serving as the purifying agent can be used for polymerizing jellies with several molecules into large particles with several tens of thousands of molecules, even hundreds of thousands of molecules. The large-particle molecular polymer is easy to settle in the vanadium solution and can be separated from the solution. The method provided by the invention has the advantages that the consumption of polyaluminium chloride is low, the flocculation process is simple, the flocculation capacity is strong, the flocculation speed is high, pollution is hardly caused and the cost is low.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for preparing high-purity vanadium pentoxide from a vanadium solution by roasting. Background technique [0002] The current method for preparing high-purity vanadium pentoxide is to prepare high-purity vanadium pentoxide through dissolution and a series of purification processes with ammonium metavanadate or ammonium polyvanadate. The production cost of this method is high, and the environmental pollution is serious. Roasting with vanadium stone coal mine with additives, leaching with low acid, exchanging and desorbing with strong basic anion resin, purifying the desorption liquid with 18-water aluminum sulfate, adding ammonium salt to precipitate vanadium after desorption liquid purification, and calcining to get vanadium pentoxide, which is five The common production method of vanadium oxide, this production method can only produce vanadium pentoxide with a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02
Inventor 程立
Owner 贵州义信矿业有限公司
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