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System and method of high purity vanadium electrolyte preparation

An electrolyte, high-purity technology, applied in the chemical method of reacting liquid with liquid, acid electrolyte, aqueous electrolyte, etc., can solve the problems of reducing battery efficiency, affecting charging and discharging efficiency, affecting vanadium ion stability, etc., and achieving good economic Benefits and social benefits, simple electrolyte configuration and assembly, low production energy consumption and low operating costs

Active Publication Date: 2016-12-28
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the impurity concentration in the electrolyte is high, it will bring the following problems: (1) There is a competitive reaction between impurity ions and vanadium ions, reducing battery efficiency
(2) In the positive electrode chamber, impurity ions are deposited on the graphite felt electrode, which blocks the gaps of the graphite felt and reduces the specific surface area of ​​the graphite felt, thereby affecting the charge and discharge efficiency
(3) In the negative electrode chamber, impurity ions will affect the hydrogen evolution overpotential, and gas production will affect the pressure balance inside the battery
(4) Impurity ions reduce the life of the proton exchange membrane
(5) Impurity ions affect the stability of vanadium ions, resulting in premature aging of the electrolyte
The main problem that this patent exists is: no specific reduction process is given, reducing V in hydrogen 2 o 5 Preparation V 2 o 4 The powder is easy to be over-reduced or under-reduced, and it needs precise control to realize it. The measures for accurately controlling the reduction are not listed in the patent; the purity is low; Chinese patents CN101880059A and CN102557134A disclose a process for producing high-purity vanadium trioxide Fluidized reduction furnace and reduction method, by adding heat transfer internal components in the fluidized bed, to achieve enhanced heat transfer; using cyclone preheating to improve energy utilization, to achieve V 2 o 3 Efficient preparation of
The method described in these two patents is only applicable to V 2 o 3 It is not suitable for the preparation of low-valent vanadium oxides in other valence states, because the system does not have the function of precisely controlling the reduction

Method used

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  • System and method of high purity vanadium electrolyte preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] combine figure 1 , the system for preparing high-purity vanadium electrolyte used in this embodiment includes a vanadyl trichloride storage tank 1, an ammonium salt precipitation device 2, an ammonium salt feeding device 3, a preheating system 4, a reducing fluidized bed 5, and a cooling system 6. Secondary cooling device 7, low-valent vanadium oxide feeding device 8, dissolution and activation reaction kettle 9;

[0068] Described ammonium salt precipitation device 2 comprises ammonium salt precipitation reaction tank 2-1 and washing filter 2-2;

[0069] Described ammonium salt feeding device 3 comprises ammonium salt feed bin 3-1 and ammonium salt screw feeder 3-2;

[0070] The preheating system 4 includes a primary cyclone preheater 4-1, a Venturi preheater 4-2, a secondary cyclone preheater 4-3, and a first cyclone separator 4-4;

[0071] The reducing fluidized bed 5 includes a feeder 5-1, a bed body 5-2, a discharger 5-3, a gas heater 5-4, a gas purifier 5-5, and...

Embodiment 2

[0082] The present embodiment utilizes the above-mentioned system to prepare the method for high-purity vanadium electrolyte, and specific method comprises the following steps:

[0083] The vanadyl trichloride liquid in the vanadyl trichloride storage tank 1 enters the ammonium salt precipitation reaction tank 2-1 through a pipeline to generate ammonia water from the main pipe of purified ammonia water and the ammonia-rich tail gas of the reducing fluidized bed 5. Hydrolysis and precipitation to form a mixed slurry containing ammonium polyvanadate and ammonium metavanadate ammonium salt precipitation and ammonium chloride solution; the generated flue gas is sent to the tail gas treatment system; the slurry enters the washing filter 2-2 and passes through Washing with clean water and filtering to obtain washing liquid and ammonium salt precipitation powder; the washing liquid is sent to the wastewater treatment system; the ammonium salt precipitation is sent to the ammonium salt...

Embodiment 3

[0086] This embodiment takes vanadyl trichloride (above the purity of 2N) as raw material, and the processing capacity is 3kg / h. In the ammonium salt precipitation reaction tank 2-1, the mass ratio of adding purified ammonia water to vanadyl trichloride is 0.5, and the operating temperature is At 90°C, a mixed slurry containing ammonium polyvanadate and ammonium metavanadate ammonium salt precipitation and ammonium chloride solution is obtained. The slurry enters the washing filter 2-2 and is washed with clean water. After filtering, the washed liquid and ammonium salt precipitation powder, the washing liquid is sent to the waste water treatment system, and the ammonium salt precipitation enters the reduction fluidized bed after being preheated by the preheating system; in the reduction fluidized bed 5, the reducing gas fed into The coal gas fraction in the mixed gas of nitrogen and coal gas in the reduction fluidized bed 5 is 10%, the average residence time of the powder is 90...

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Abstract

The invention discloses a system and method of high purity vanadium electrolyte preparation. Vanadium oxytrichloride as a raw material is precipitated by an ammonium salt, the precipitates are subjected to liquid reduction so that a low valent vanadium oxide is produced, a sulfuric acid solution and clean water are added into the low valent vanadium oxide and the mixture is treated under conditions of supersonic wave-assisted dissolution and activation at a low temperature so that a high purity vanadium electrolyte is formed. Through heat exchange between an ammonium salt and reduction tail gas and between a reduction product and fluidized nitrogen, heat is efficiently used. The ammonia gas in the reduction tail gas is recovered and used for vanadium precipitation so that ammonia gas recycling is realized. An inner member is arranged in a reduction fluidized bed so that accurate control of a reduction product valence is realized. Through use of supersonic wave-assisted dissolution and activation, the vanadium electrolyte is prepared at a low temperature and electrolyte activity is greatly improved. The method has the advantages of short process, high efficiency, cleaness and stable product quality, is suitable for large scale industrial production and has good economic benefits and social benefits.

Description

technical field [0001] The invention belongs to the fields of energy and chemical industry, and in particular relates to a system and method for preparing high-purity vanadium electrolyte. Background technique [0002] Traditional fossil fuels have always been the main source of energy. Due to long-term mining and extensive use, they are facing the problem of resource depletion, and also bring serious environmental pollution. The development and utilization of clean and renewable energy such as wind energy, water energy, solar energy, and tidal energy has gradually attracted the attention of human society. However, renewable energy is inherently intermittent, and existing energy management systems are difficult to use effectively. [0003] Energy storage technology is one of the ways to solve such problems. Among various energy storage systems, vanadium redox flow battery (VRB) is an attractive energy storage device. The biggest advantage of VRB is its flexibility - the p...

Claims

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Application Information

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IPC IPC(8): H01M8/18
CPCH01M8/188H01M2300/0011H01M8/18Y02E60/50Y02P70/50H01M2300/0017B01J4/008B01J8/0045B01J8/0055B01J8/007B01J8/1818B01J8/1836B01J14/00B01J2208/00752B01J2208/00761C01G31/02
Inventor 朱庆山杨海涛范川林牟文恒刘吉斌王存虎班琦勋
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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