Method for extracting vanadium from high-phosphoric acid vanadium solution and recycling wastewater

A technology with high phosphoric acid and waste water recovery, applied in the direction of vanadium oxide, etc., can solve the problems of vanadium deposition and water cycle difficulties, achieve good social and economic benefits, low equipment requirements, and convenient operation

Active Publication Date: 2021-02-05
攀枝花市山青钒业有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for extracting vanadium from high phosphoric acid vanadium solution and recycling waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] a: Get 10000mL of high phosphoric acid vanadium liquid (main chemical composition as shown in table 1) that leaching obtains, add 250ml mass fraction under normal temperature and be 30% hydrogen peroxide, stir reaction 30min, filter precipitation and obtain vanadium liquid; Get 10000ml vanadium liquid and 2500ml extraction agent (the tertiary amine TNOA that contains 10 volume %, the isooctyl alcohol of 20 volume % and the sulfonated kerosene of 70 volume %) react 2min at normal temperature, obtain raffinate (V content is 0.1g / L) and rich vanadium Organic phase (V content is 13.6g / L), the extraction rate is 97.14%.

[0059] b: The raffinate is directly returned to the leaching process for recycling.

[0060] c: Get 500ml of 5% by weight sodium hydroxide solution and 1250ml vanadium-rich organic phase to react at room temperature for 2min, separate the organic phase and the water phase to obtain a 500ml stripping solution (V content is 33.75g / L), add 25g of sodium hydro...

Embodiment 2

[0065] a: Get 10000mL of the highly phosphoric acid vanadium liquid (main chemical composition shown in table 1) obtained by leaching, add 20g ammonium persulfate at normal temperature, stir and react for 30min, filter and precipitate to obtain vanadium liquid; get 10000ml vanadium liquid and 2500ml extractant ( Containing the tertiary amine TNOA of 10 volume %, the isooctyl alcohol of 20 volume % and the sulfonated kerosene of 70 volume %) under normal temperature reaction 30min, obtain raffinate (V content is 0.05g / L) and rich vanadium organic phase (V content 13.8g / L), the extraction rate was 98.57%.

[0066] b: The raffinate is directly returned to the leaching process for recycling.

[0067] c: Get 250ml of 30% by weight of sodium carbonate solution and 1250ml of vanadium-rich organic phase to react at room temperature for 30min, separate the organic phase and the water phase to obtain a 500ml stripping solution (V content is 68.5g / L), add 50g Sodium carbonate, continue ...

Embodiment 3

[0072] a: Get 10000mL of the highly phosphoric acid vanadium liquid (main chemical composition shown in table 1) obtained by leaching, add 25g sodium chlorate at normal temperature, stir and react for 20min, filter and precipitate to obtain vanadium liquid; get 10000ml vanadium liquid and 500ml extractant ( Containing the tertiary amine TNOA of 10 volume %, the isooctyl alcohol of 20 volume % and the sulfonated kerosene of 70 volume %) under normal temperature reaction 20min, obtain raffinate (V content is 0.5g / L) and rich vanadium organic phase (V content 60g / L), the extraction rate was 85.71%.

[0073] b: The raffinate is directly returned to the leaching process for recycling.

[0074] c: Take 250ml of 30% ammonia solution and 250ml of vanadium-rich organic phase to react at room temperature for 20min, separate the organic phase and the water phase to obtain 250ml of stripping solution (V content is 58g / L), and pass 50g of liquid ammonia into the stripping solution , conti...

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PUM

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Abstract

The invention relates to the technical field of chemical engineering, and in particular, relates to a method for extracting vanadium from a high-phosphoric acid vanadium solution and recycling wastewater. The method comprises the steps: a, adding an oxidizing agent into the high-phosphoric acid vanadium solution, filtering to obtain a vanadium solution, and extracting to obtain a vanadium-rich organic phase and raffinate; b, returning the raffinate to a leaching process for use; c, performing first-stage reverse extraction on part of the vanadium-rich organic phase to obtain a reverse extraction liquid, supplementing and adding alkaline substances into the reverse extraction liquid, and adding the remaining vanadium-rich organic phase for second-stage reverse extraction to obtain high-concentration vanadium liquid; d, adding a vanadium precipitation agent into the high-concentration vanadium liquid for reaction, filtering to obtain ammonium metavanadate and vanadium precipitation raffinate, and calcining ammonium metavanadate to obtain vanadium oxide; and e, pretreating the vanadium precipitation residual liquid, and then returning the pretreated vanadium precipitation residual liquid to the step c to be used. According to the method, a circulating reverse extraction process is adopted, water circulation is realized, the concentration of vanadium in the reverse extraction liquid is increased, and the wastewater after vanadium precipitation can also be recycled.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for extracting vanadium from highly phosphoric acid vanadium solution and recycling waste water. Background technique [0002] In the process of extracting vanadium from vanadium-containing materials, some materials containing high calcium, high phosphorus and low vanadium are involved. In the clinker or raw materials after leaching and roasting, vanadium and phosphorus will be leached into the solution at the same time, which will form acidic high phosphorus and low vanadium In the solution, such as acidic vanadium solution with vanadium at 10-50g / L and phosphorus content at 2-50g / L, it is difficult to remove phosphorus by ordinary chemical impurity removal methods. Even if phosphorus can be removed, vanadium will enter into precipitation, causing massive loss of vanadium. In addition, it is very difficult to realize the circulation of vanadium-precipitated w...

Claims

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Application Information

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IPC IPC(8): C01G31/02
CPCC01G31/02C01P2006/80
Inventor 刘元平刘元洪
Owner 攀枝花市山青钒业有限公司
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