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Method for preparing vanadium pentoxide

A technology of vanadium pentoxide and sodium hydroxide, which is applied in the direction of vanadium oxide, etc., can solve the problems of large consumption and complicated process, and achieve the effects of saving raw materials, simple process and convenient operation

Active Publication Date: 2015-04-01
PANGANG GROUP RESEARCH INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is complex in process and introduces a two-step "alkali redissolution", which requires the consumption of a large amount of sodium hydroxide and sulfuric acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] The preparation method of vanadium pentoxide of the present invention comprises the following steps:

[0021] A, back dissolving: ammonium polyvanadate is dissolved in sodium hydroxide solution, gets back solution; By mass ratio, ammonium polyvanadate: sodium hydroxide=1:0.8~2, the vanadium concentration in the gained back solution is 90 ~120g / L, at this time, the pH value of the returned solution can be measured to be 11~13;

[0022] b. Crystallization: leave the returned solution at room temperature for 20-40 hours, filter, take the filtrate, and crystallize the filtrate at 2-5°C to obtain solid sodium metavanadate;

[0023] c, adding water to dissolve: the sodium metavanadate solid is dissolved in water to obtain a solution, adjust the amount of water added so that the vanadium concentration in the solution is 60-90g / L, at this time, the pH of the solution is 11-13;

[0024] d. Precipitation of vanadium: add ammonium sulfate or ammonium chloride to the solution, rea...

Embodiment 1

[0034] a. Weigh 200g of ammonium polyvanadate and place it in beaker A, weigh 200g of sodium hydroxide and dissolve it in beaker B filled with 930ml of water. Slowly pour the sodium hydroxide solution into beaker A, stir, and react at room temperature for 30 minutes until the solid is completely dissolved. At this time, the concentration of vanadium in the solution was 110 g / L, and the pH value was 12.

[0035] b. Cool at room temperature, let stand for 24 hours, and filter three times with Buchner funnel and other filtering equipment. The filtrate is placed in a constant temperature and humidity box, the temperature is adjusted to 2-5°C, and it is left to stand for more than 10 hours until the white sodium metavanadate solid is precipitated. Solid-liquid separation, weighing solid is 150g.

[0036] c. Dissolve the solid obtained in step b in 840 ml of deionized water, add 487 g of ammonium sulfate, and bathe in 60° C. water bath for 1 hour until a large amount of white soli...

Embodiment 2

[0039] a. Weigh 200g ammonium polyvanadate and place it in beaker A, weigh 400g sodium hydroxide and dissolve it in beaker B filled with 1030ml water. Slowly pour the sodium hydroxide solution into beaker A, stir, and react at room temperature for 30 minutes until the solid is completely dissolved. At this time, the concentration of vanadium in the solution was 100 g / L, and the pH value was 13.

[0040] b. Cool at room temperature, let stand for 40 hours, and filter three times with Buchner funnel and other filtering equipment. The filtrate was placed in a constant temperature and humidity box, the temperature was adjusted to 2-5°C, and it was left to stand for 12 hours until the white sodium metavanadate solid was precipitated. Solid-liquid separation, the weighing solid is 153g.

[0041] c. Dissolve the solid obtained in step b in 1000ml of deionized water, add 717g of ammonium chloride, and bathe in 65°C water bath for 0.5h until a large amount of white solids are precipi...

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PUM

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Abstract

The invention relates to a method for preparing vanadium pentoxide and belongs to the field of fine chemical engineering. The purpose of preparation of the vanadium pentoxide is achieved. The method includes the following steps of a, re-dissolution, b, crystallization, c, water addition for dissolution, d, vanadium settlement, and e, calcination, wherein in the re-dissolution step, ammonium polyorthovanadate is dissolved in a sodium hydroxide solution, so that a re-dissolution solution is acquired; in the crystallization step, the re-dissolution solution stands still for 20 h to 40 h at the indoor temperature and filtered, filtrate is acquired and stands at the temperature from 2 DEG C to 5 DEC G so as to be crystallized, and sodium metavanadate solid is acquired; in the step of water addition for dissolution, water is added to the sodium metavanadate solid for dissolution, so that a dissolved solution is acquired; in the vanadium settlement step, ammonium sulfate or ammonium sulfate is added to the dissolved solution, a reaction is conducted at the temperature from 45 DEG C to 65 DEG C for 0.5 h to 2 h, the solution is filtered, and ammonium metavanadate solid is acquired; in the calcination step, the ammonium metavanadate solid is calcined, so that vanadium pentoxide is acquired. According to the method, the vanadium pentoxide with high purity can be obtained, the process is simple, and operation is convenient; in the preparation process, vanadium pentoxide can be prepared by adding a small amount of sodium hydroxide and ammonium salt, raw materials are saved, and the method accords with the industrial policies of energy conservation and emission reduction.

Description

technical field [0001] The invention relates to a preparation method of vanadium pentoxide, which belongs to the field of fine chemical industry. Background technique [0002] High-purity vanadium pentoxide refers to reducing the content of impurities such as silicon, phosphorus, iron, calcium, magnesium, chromium, aluminum, nickel, potassium, and sodium in vanadium on the basis of the standard of ordinary vanadium pentoxide GB3283-87. In the national standard limit (less than 0.005%). Because the country has not set a high standard, vanadium pentoxide with a purity higher than the national standard is high-purity vanadium pentoxide. The high-purity vanadium pentoxide defined in the present invention refers to vanadium pentoxide with a purity greater than or equal to 99.9%. [0003] In fine chemical industry, high-purity vanadium pentoxide can be used as catalyst for organic synthesis, desulfurization and destocking, sulfuric acid preparation, high-purity vanadyl sulfate, ...

Claims

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Application Information

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IPC IPC(8): C01G31/02
CPCC01G31/02C01P2006/80
Inventor 杨林江程兴德蒋仁贵李道玉毛凤娇陈文龙彭穗曹敏
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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