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Process for preparinbg vanadylic sulfate and use

A technology of vanadyl sulfate and sulfuric acid, applied in chemical instruments and methods, vanadium compounds, inorganic chemistry, etc., can solve the problems of unstable sulfurous acid, polluting the environment, and complicated processes.

Inactive Publication Date: 2004-04-28
攀枝花钢铁有限责任公司钢铁研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above technical route, V 2 o 5 It needs to be heated to dissolve in sulfuric acid, and at the same time, due to the use of excess sulfuric acid to dissolve V 2 o 5 , resulting in more free acid remaining in the product, H in the solution + The concentration reaches 2mol / L, which is not conducive to evaporative crystallization. Moreover, due to the use of reducing agents, the impurities introduced by the reducing agent are not easy to remove, such as: using oxalic acid as the reducing agent, the excess oxalic acid is not easy to remove; Unstable, easy to escape a large amount of SO during the reaction 2 ,polluted environment
[0003] The above method is complicated in process and high in cost, but it is widely used and has been used till now.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take V 2 o 3 (V 2 o 3 : TV 62%) 48g, V with a purity of 98% 2 o 5 27g, H with a specific gravity of 1.84 2 SO 4 85g, dilute sulfuric acid with distilled water at a ratio of 1:1, add V 2 o 3 , and then gradually add V 2 o 5 , stirred at the same time, filtered after cooling to obtain a blue vanadyl sulfate solution, after testing; the pH is 1.2, the vanadium concentration is 4.2mol / L, and the ratio V(IV) / TV>99% of tetravalent vanadium and total vanadium. Heating, evaporating and crystallizing, a blue crystal is obtained, and the crystal is dried at 80°C for 5 hours for dehydration, and the test: TV30%. The prepared vanadyl sulfate was formulated into an electrolyte with a vanadium concentration of 2mol / L according to the requirements of the vanadium battery, and put into the electrolytic cell for charge and discharge experiments: the charging platform was 1.7V, and the discharging platform was 1.4V.

Embodiment 2

[0019] Take V 2 o 3 (V 2 o 3 : TV 65%) 74g, V with a purity of 98.5% 2 o 5 27g, H with a specific gravity of 1.84 2 SO 4 37g, dilute sulfuric acid with distilled water at a ratio of 1:1, add V 2 o 3 and V 2 o 5 , while stirring, cooling and filtering to obtain a blue vanadyl sulfate solution, which was tested; the pH is 0.92, the vanadium concentration is 4.2mol / L, and the ratio of tetravalent vanadium to total vanadium V(IV) / TV>99%. Heating, evaporating and crystallizing, a blue crystal is obtained, and the crystal is dried at 80°C for 5 hours for dehydration, and the test: TV30.2%. The prepared vanadyl sulfate was formulated into an electrolyte with a vanadium concentration of 2mol / L according to the requirements of the vanadium battery, and put into the electrolytic cell for charge and discharge experiments: the charging platform was 1.7V, and the discharging platform was 1.4V.

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PUM

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Abstract

The preparation process of vanadylic sulfate includes adding V2O3 and V2O5 into sulfuric acid, filtering and evaporating the filtrate, eliminating crystalline water to obtain light blue VOSO4 powder. Compared with available technological path, the said technological process of the present invention has less steps, mild reaction condition, simple technological process, low cost and stable product quality. The filtrate may be used as the material as electrolyte in vanadium cell.

Description

Technical field: [0001] The invention relates to a preparation method and application of vanadyl sulfate, in particular to the application of vanadyl sulfate in preparing all-vanadium ion batteries. Background technique: [0002] Maria Skyllas-Kazacos of the School of Chemical Engineering and Industrial Chemistry at the University of New South Wales (UNSW) in Australia began to publish research results on vanadium batteries in 1985, mainly using vanadyl sulfate as the active material of the battery. Vanadium batteries are considered to be more competitive chemical power sources than lead batteries and have huge market potential. The technical route of existing synthetic vanadyl sulfate is: V 2 o 5 → heating and dissolving sulfuric acid → cooling and diluting → reducing by adding reducing agent (oxalic acid or sulfurous acid, etc.) → evaporative crystallization → dehydration → VOSO 4 Light blue powder. Vanadyl sulfate is also a kind of chemical raw material, which is used...

Claims

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Application Information

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IPC IPC(8): C01G31/00H01M4/58
CPCY02E60/12Y02E60/10
Inventor 李林德陈厚生
Owner 攀枝花钢铁有限责任公司钢铁研究院
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