Vanadium Pentoxide Purification via Low-Temperature Chlorination
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Solution Overview
Problem
Current methods for producing high-purity vanadium pentoxide face challenges such as high production costs, low efficiency, and environmental pollution due to the use of expensive reagents and energy-intensive processes, as well as difficulties in achieving and maintaining high purity levels above 3N5, and the generation of significant wastewater.
Innovation Solution
A system and method involving a low temperature chlorination fluidized bed, rectification and purification device, gas phase hydrolyzation fluidized bed, and calcination fluidized bed, which includes heat exchange and balanced heat supply to stabilize chlorination temperatures, reduce energy consumption, and minimize wastewater production, using industrial grade vanadium pentoxide and carbon powder with controlled chlorination and hydrolysis processes to achieve high-purity vanadium pentoxide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If chemical precipitation purification and solvent extraction/ion resin exchange are used to purify vanadium solution, then the purity of vanadium pentoxide can be improved, but the cost increases due to expensive reagents and the process complexity increases
Solution Approach 1:
The invention extracts and removes impurity ions (Fe3+, Al3+, Ca2+, Mg2+, Na+, K+) from the vanadium solution through selective precipitation reactions, separating them from the vanadium-containing solution to achieve high purity vanadium pentoxide product
Solution Approach 2:
The invention changes pH parameters through controlled addition of alkali to precipitate different metal ions at different pH levels, and controls temperature parameters during the precipitation process to optimize impurity removal while maintaining vanadium in solution
2Manufacturing precision
If repeated ammonium salt precipitation operations are conducted to purify vanadium solution, then the purity of vanadium pentoxide can be improved, but the production efficiency decreases and the direct recovery rate of vanadium declines
Solution Approach 1:
The invention performs preliminary removal of major impurity ions (Fe3+, Al3+, Ca2+, Mg2+) before the ammonium salt precipitation step, so that fewer repeated precipitation operations are needed to achieve the desired purity, thereby improving production efficiency
Solution Approach 2:
The invention divides the purification process into multiple stages: initial impurity removal stage, ammonium salt precipitation stage, and final purification stage, with each stage targeting specific impurities to achieve cumulative purification effect with minimal operations
3Manufacturing precision
If calcium salt and magnesium salt scavengers or extractants are used in the purification process, then the purity of vanadium pentoxide can be improved, but impurities are introduced by the reagents themselves
Solution Approach 1:
The invention uses inexpensive, easily removable reagents such as sodium hydroxide for initial impurity removal and ammonium salts for precipitation, which do not introduce difficult-to-remove impurities and can be easily washed away from the final product
4Manufacturing precision
If extraction/back extraction, precipitation, and washing operations are conducted to purify vanadium solution, then the purity of vanadium pentoxide can be improved, but a large amount of wastewater is produced containing vanadium ions, ammonium ions, and sodium salts
Solution Approach 1:
The invention recovers vanadium from the wastewater streams by adjusting pH to precipitate vanadium as ammonium polyvanadate or metavanadate, which can be filtered and converted back to vanadium pentoxide, thereby recovering vanadium that would otherwise be lost in wastewater
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method achieves high-purity vanadium pentoxide with a purity above 4N, reduces energy consumption, minimizes wastewater production, and stabilizes operation temperatures, making it suitable for large-scale industrial production with improved economic and environmental benefits.
Implementation Method 1
low temperature chlorination fluidized bed... chemical reaction between vanadium pentoxide and carbon powder with controlled chlorination
Implementation Method 2
heat exchange and balanced heat supply to stabilize chlorination temperatures
Implementation Method 3
rectification and purification device... gas phase hydrolyzation
Implementation Method 4
gas phase hydrolyzation fluidized bed... gas phase hydrolysis of vanadium oxytrichloride
Implementation Method 5
calcination fluidized bed... calcination to obtain high-purity vanadium pentoxide powder
Implementation Method 6
low temperature chlorination fluidized bed... gas phase hydrolyzation fluidized bed... calcination fluidized bed
Data Source
AI summary
The present invention provides a system and method for producing high-purity vanadium pentoxide powder. Industrial grade vanadium pentoxide is converted to vanadium oxytrichloride by low temperature fluidizing chlorination, wherein chlorinating gas is preheated via heat exchange between fluidizing gas and chlorination flue gas, and an appropriate amount of air is added to enable a part of carbon powder to combust so as to achieve a balanced heat supply during the chlorination, thereby increasing the efficiency of chlorination and ensuring good selectivity in low temperature chlorination. The vanadium oxytrichloride is purified by rectification, and then subjected to fluidized gas phase hydrolyzation and fluidized calcination, thereby producing a high-purity vanadium pentoxide product and a by-product of hydrochloric acid solution. The system and method have advantages of favorable adaptability to raw material, no discharge of contaminated wastewater, low energy consumption in production, low operation cost, stable product quality, etc.