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Preparing method for sodium metavanadate

A technology of sodium metavanadate and sodium vanadate, applied in chemical instruments and methods, vanadium compounds, inorganic chemistry, etc., can solve the problems of large loss of vanadium, complicated steps, and high production costs, and achieve burden reduction, simplification of production steps, The effect of reducing production costs

Active Publication Date: 2013-12-04
PANGANG GRP PANZHIHUA STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the existing process has outstanding problems such as complicated steps, large loss of vanadium, high production cost, difficult wastewater treatment, and unfriendly to the environment.

Method used

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Examples

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preparation example Construction

[0009] According to the preparation method of sodium metavanadate of the present invention, the method comprises using sodium vanadate solution as an anolyte to carry out ionic membrane electrolysis, the condition of ionic membrane electrolysis makes the pH value obtained at the anode be 7.0-8.0, and sodium element and In terms of vanadium element, sodium metavanadate solution in which the molar ratio of sodium to vanadium is 0.95-1.05.

[0010] In the present invention, the sodium vanadate solution is not particularly limited, as long as it is a sodium vanadate solution commonly used in the art to prepare sodium metavanadate. For example, the sodium vanadate solution may be a solution obtained by sodium vanadate roasting and water immersion. The method of sodium vanadate solution obtained by subjecting the vanadium raw material to sodium vanadate roasting and water immersion can refer to methods well known to those skilled in the art.

[0011] According to the present invent...

Embodiment 1

[0029] This embodiment is used to illustrate the preparation of sodium metavanadate

[0030] Sodium vanadate solution (based on vanadium element Calculated, the concentration of vanadium in sodium vanadate solution is 30g / L; based on sodium and vanadium elements, the molar ratio of sodium to vanadium is 1.5; pH is 12) 500mL, the same volume of water is added to the cathode, and the voltage is controlled at 12V. The DC current was 0.05A, and electrolysis was performed for 3 hours to obtain a sodium metavanadate solution with a pH of 7.2 and a sodium-vanadium molar ratio of 0.99 in terms of sodium element and vanadium element. Concentrate the sodium metavanadate solution under reduced pressure to 100ml at 80°C, then cool to 25°C under stirring to precipitate crystals, and filter to obtain solid sodium metavanadate. The dry basis content of the obtained sodium metavanadate was 98.6 weight%.

Embodiment 2

[0032] This embodiment is used to illustrate the preparation of sodium metavanadate

[0033] Add sodium vanadate solution (in terms of vanadium element, the concentration of vanadium in the sodium vanadate solution is 35g / L; in terms of sodium element and vanadium element, the sodium vanadium mol ratio is 1.8; pH is 11) 500mL, the same volume of water is added to the cathode, the voltage is controlled at 15V, the direct current is 1.2A, electrolysis is performed for 4 hours, and the pH is 7.5, and the sodium and vanadium molar ratio is 0.98. Sodium vanadate solution. Concentrate the sodium metavanadate solution under reduced pressure to 100ml at 80°C, then cool to 25°C under stirring to precipitate crystals, and filter to obtain solid sodium metavanadate. The dry basis content of the obtained sodium metavanadate was 98.3 weight%.

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Abstract

The invention discloses a preparing method for sodium metavanadate. The preparing method comprises the steps: a sodium vanadate solution as an anode electrolyte solution undergoes ionic membrane electrolysis, a sodium metavanadate solution with a pH value of 7.0-8.0 and the molar ratio between sodium and vanadium being 0.95-1.05 according to sodium element and vanadium element is obtained at an anode under the ionic membrane electrolysis condition. According to the preparation method of sodium metavanadate, vanadium pentoxide does not need to be firstly prepared, sodium metavanadate can be directly prepared by the sodium vanadate solution, and thus the production steps are simplified; moreover, because sulfuric acid does not need to be employed to adjust the pH value and ammonium sulfate does not need to be employed to precipitate ammonium vanadate, vanadium precipitation wastewater containing sodium sulfate and ammonium sulfate is not produced, and thus the burden on the environment is reduced; and because the vanadium precipitation wastewater containing sodium sulfate and ammonium sulfate is not produced, the vanadium precipitation wastewater does not need to be processed, and thus the production cost is reduced.

Description

technical field [0001] The invention relates to a preparation method of sodium metavanadate. Background technique [0002] Sodium metavanadate (NaVO 3 ) is a colorless monoclinic prism crystal with a melting point of 630°C, soluble in water, non-combustible, and low toxicity. It is usually used in chemical fertilizers, gas desulfurization, photography, etc., and is also used as a mordant. [0003] The existing preparation method of sodium metavanadate usually first prepares high-purity vanadium pentoxide through vanadium-containing minerals, then dissolves vanadium pentoxide in high-purity sodium hydroxide solution, evaporates, concentrates, and crystallizes Sodium metavanadate product is obtained. The preparation process of vanadium pentoxide is as follows: the vanadium-containing mineral is subjected to sodium roasting and water immersion to obtain an alkaline sodium vanadate solution; the alkaline sodium vanadate solution is purified to remove impurities to obtain an a...

Claims

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Application Information

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IPC IPC(8): C25B1/00C25B1/14C01G31/00
Inventor 李千文韦林森
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM
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