Method for preparing vanadyl sulfate

A technology of vanadyl sulfate and sulfuric acid, which is applied in chemical instruments and methods, vanadium compounds, inorganic chemistry, etc., and can solve problems such as environmental pollution

Inactive Publication Date: 2010-12-22
PANGANG GRP PANZHIHUA STEEL & VANADIUM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The above-mentioned methods all use vanadium oxides as raw materials to produce vanadyl sulfate, and vanadium oxides are generally prepared by calcining ammonium metavanadate. This process produces ammonia, thus causing environmental pollution.

Method used

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preparation example Construction

[0010] According to the preparation method of vanadyl sulfate of the present invention, ammonium metavanadate is used as raw material, and the following steps are adopted to complete: first, ammonium metavanadate is calcined at a temperature of 540°C to 600°C in a closed reactor; Add sulfuric acid to the obtained product and pass through SO 2 The gas is heated and boiled; the solution obtained after heating and boiled is crystallized to obtain vanadyl sulfate.

[0011] Calcining ammonium metavanadate at a temperature of 540°C to 600°C can fully decompose ammonium metavanadate into V 2 o 5 and ammonia, and the obtained ammonia is further decomposed into nitrogen and hydrogen, hydrogen will V 2 o 5 revert to V 2 o 4 . The product of ammonium metavanadate after closed calcination is mainly V 2 o 4 and a small amount of unreduced V 2 o 5 , adding sulfuric acid to this product can make V 2 o 4 React with sulfuric acid to generate vanadyl sulfate, and pass through SO 2 ...

Embodiment 1

[0016] Add 500g of ammonium metavanadate into a closed heating furnace, calcinate at a temperature of 540°C to 550°C for 2.5 hours, and take out the product; add water with a volume ratio of 1:1 and 500ml of 98% concentrated sulfuric acid to the taken out product, Purify and recover industrial SO at a flow rate of 100L / min 2 gas (purity is 99%), and heated and boiled at a temperature greater than 95°C for 60min; the sky blue solution obtained through the above steps was evaporated and crystallized to obtain vanadyl sulfate (VOSO 4 )powder. In the prepared vanadyl sulfate powder, the content of vanadyl sulfate is greater than 98.5%, the content of pentavalent vanadium is less than 0.5%, and the content of non-precipitating substances in the ammonium hydroxide solution is less than 1.5%.

Embodiment 2

[0018] Add 1000g of ammonium metavanadate into a closed heating furnace, calcinate at a temperature of 550°C to 560°C for 1 hour, and take out the product; add water with a volume ratio of 1:2 and 750ml of 98% concentrated sulfuric acid to the taken out product, Purify and recover industrial SO at a flow rate of 1000L / min 2 Dilute the gas, and heat and boil at a temperature greater than 94 ° C for 90 minutes, the industrial SO 2 The dilution gas includes 20% to 25% SO by volume percentage 2 , 60% to 65% of N 2 , 7% to 15% O 2 and 1% to 5% CO 2 ; The sky blue solution obtained through the above steps is evaporated and crystallized to obtain vanadyl sulfate (VOSO 4 )powder. In the prepared vanadyl sulfate powder, the content of vanadyl sulfate is greater than 98.3%, the content of pentavalent vanadium is less than 0.5%, and the content of non-precipitating substances in the ammonium hydroxide solution is less than 1.2%.

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Abstract

The invention discloses a method for preparing vanadyl sulfate, comprising the following steps of: calcining ammonium metavanadate at the temperature of 540-600 DEG C in a closed reactor; adding sulphuric acid to a product obtained by calcining, and introducing an SO2 gas to carry out heating and stewing; and crystallizing a solution obtained after the heating and the stewing so as to obtain the vanadyl sulfate. The method for preparing the vanadyl sulfate does not generate a pollutant, i.e. an ammonia gas, and effectively utilizes the SO2 gas generated in industry, thereby having very well environmental benefits.

Description

technical field [0001] The invention relates to a method for preparing vanadyl sulfate, in particular to a method for preparing vanadyl sulfate by using ammonium metavanadate. Background technique [0002] Vanadyl sulfate is also called vanadyl sulfate, and its chemical formula is VOSO 4 . Vanadyl sulfate is a widely used chemical raw material, mainly used as a mordant for dyeing and weaving, a colorant for glass and ceramics, and an electrolyte in vanadium batteries. In addition, vanadyl sulfate can promote protein synthesis and help transport nutrients, so vanadyl sulfate is also widely used in the pharmaceutical industry. [0003] The preparation technology of traditional vanadyl sulfate is based on vanadium pentoxide (V 2 o 5 ) or vanadium trioxide (V 2 o 3 ) as a raw material, reducing the pentavalent vanadium in vanadium pentoxide to tetravalent vanadium, or oxidizing the trivalent vanadium in vanadium trioxide to tetravalent vanadium, then adding sulfuric acid a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/00
Inventor 王永钢邓孝伯周芳刘学文付自碧
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM
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