Method for preparing vanadyl sulfate by use of vanadium-containing chloride solution

A technology of vanadyl sulfate and vanadyl sulfate solution, applied in the preparation of vanadium compounds, vanadium compounds, chemical instruments and methods, etc., can solve problems such as high cost, influence product purity, etc., and achieve high recovery rate, high product quality, Avoid energy-intensive effects

Inactive Publication Date: 2017-02-15
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
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AI Technical Summary

Problems solved by technology

This process uses high-purity vanadium pentoxide as raw material, and the cost is high; after the high-purity vanadium pen

Method used

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  • Method for preparing vanadyl sulfate by use of vanadium-containing chloride solution

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The main components of the vanadium-containing chloride solution are: the V content is 8.3g / L, the Fe content is 78.7g / L, the Ca content is 17.4g / L, the Mg content is 1.1g / L, and the Al content is 9.4g / L;

[0035] 1) Heating the solution to 30°C, stirring, adding iron powder for reduction, reducing V(Ⅴ) in the solution to V(Ⅳ), reducing Fe(Ⅲ) to Fe(II), and filtering to obtain a reduced solution;

[0036] 2) Step 1) is used to obtain the reduction solution using Na 2 CO 3 Adjust the pH value of the reducing solution to 0.5, and filter;

[0037] 3) The solution obtained in step 2) is mixed with a mixed extractant of P507, TBP and kerosene (volume ratios of 5%, 5%, and 90% respectively) for extraction, O / A=2:1, and the vanadium-loaded organic phase is obtained;

[0038] 4) Back-extract the vanadium-loaded organic phase obtained in step 3) with 10% sulfuric acid solution, O / A=1:1, to obtain a vanadium solution;

[0039] 5) the vanadium solution obtained in step 4) is ad...

Embodiment 2

[0044] The main components of the vanadium-containing chloride solution are: the V content is 15.3g / L, the Fe content is 14.7g / L, the Ca content is 5.3g / L, the Mg content is 4.1g / L, and the Al content is 3.4g / L;

[0045] 1) Heating the solution to 90°C, stirring, adding sodium sulfite for reduction, reducing V(Ⅴ) in the solution to V(Ⅳ), reducing Fe(Ⅲ) to Fe(II), and filtering to obtain a reduced solution;

[0046] 2) Using hydrochloric acid to adjust the pH value of the reducing solution to 1.1 in the reducing solution obtained in step 1);

[0047] 3) Mix the filtered solution obtained in step 2) with a mixed extractant of P507, TBP and n-heptane (volume ratios of 25%, 15%, and 60% respectively) for extraction, O / A=1:2, and obtain loaded vanadium The organic phase;

[0048]4) Back-extract the vanadium-loaded organic phase obtained in step 3) with 20% sulfuric acid solution, O / A=1:1, to obtain a vanadium solution;

[0049] 5) the vanadium solution obtained in step 4) is adju...

Embodiment 3

[0054] The main components of the vanadium-containing chloride solution are: the V content is 3.5g / L, the Fe content is 0.3g / L, the Ca content is 3.1g / L, and the Al content is 2.7g / L;

[0055] 1) Heating the vanadium-containing chloride solution to 60° C., stirring, adding sodium sulfite for reduction, reducing V(Ⅴ) in the solution to V(Ⅳ) and Fe(Ⅲ) to Fe(II), and filtering to obtain a reduced solution;

[0056] 2) Using calcium carbonate to adjust the pH value of the reducing solution to 2 in the reducing solution obtained in step 1);

[0057] 3) The filtered solution obtained in step 2) is mixed with a mixed extractant of P204, TBP and n-heptane (volume ratios of 40%, 5%, and 55% respectively) for extraction, O / A=1:4, and the loaded vanadium is obtained The organic phase;

[0058] 4) Back-extract the vanadium-loaded organic phase obtained in step 3) with 40% sulfuric acid solution, O / A=1:1, to obtain a vanadium solution;

[0059] 5) the vanadium solution obtained in step 4...

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Abstract

The invention belongs to the field of wet-process metallurgy and particularly relates to a method for preparing vanadyl sulfate by use of a vanadium-containing chloride solution. The method comprises the following steps: 1) heating and reducing the vanadium-containing chloride solution, thereby obtaining a reduction solution; 2) regulating the pH value of the reduction solution to 0-2; 3), performing extraction, thereby obtaining a vanadium-loaded organic phase; 4) performing reverse extraction, thereby obtaining a vanadium solution; 5) regulating the pH value of the vanadium solution to 1-3; 6) extracting the solution, thereby obtaining the vanadium-loaded organic phase; 7) performing reverse extraction, thereby obtaining a vanadyl sulfate solution; and 8) absorbing the vanadyl sulfate solution by use of an adsorbent, thereby obtaining a vanadyl sulfate solution final product. According to the method, HCl leaching liquid containing vanadium resources, such as titaniferous magnetite and an SCR dead catalyst are utilized as raw materials, and an extraction-reverse extraction-deep impurity removal method is adopted, so that the method provided by the invention is capable of directly preparing high-purity anadyl sulfate from the vanadium-containing chloride solution, and has the advantages of short process and low cost.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a method for preparing high-purity vanadyl sulfate from a vanadium-containing chloride solution. Background technique [0002] All vanadium redox flow battery (all vanadium redox flow battery) has many advantages such as long service life, flexible charging and discharging methods, high current deep charging and discharging, no cross pollution and energy loss, etc., and can be applied to peak-shaving power supply systems, large Large-scale photoelectric conversion systems, wind energy utilization systems, uninterruptible power supplies and emergency power supplies, power supply systems, etc., are considered to be the most promising green energy storage batteries. The all-vanadium redox flow battery is mainly composed of electrodes, electrolyte, battery diaphragm, liquid storage tank, stack, etc.; vanadyl sulfate is an important part of the electrolyte and has received e...

Claims

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Application Information

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IPC IPC(8): C01G31/00
CPCC01G31/00C01G31/003C01P2006/80
Inventor 陈德胜李丹齐涛赵宏欣王丽娜张国之王伟菁刘亚辉
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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