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Method for preparing vanadyl sulfate electrolyte by hydrazine hydrate/oxalic acid reduction

The technology of vanadyl sulfate solution and vanadyl sulfate is applied in the direction of acidic electrolyte, aqueous electrolyte, circuit, etc., can solve the problems of low utilization rate of vanadium and the like, and achieve the effect of low cost and simple process

Inactive Publication Date: 2016-05-25
王晓伟
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The vanadium utilization rate of this method is low, and the electrolyte purity also depends on the raw material V 2 o 5 the purity of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] The method that this hydrazine hydrate / oxalic acid reduction prepares vanadyl sulfate electrolyte comprises the following steps,

[0013] Step (1): Calcium hydroxide is extracted with vanadium slag and stone coal to obtain a vanadyl sulfate solution with a pH of 3.0 to 4.0; the vanadyl sulfate solution with a pH of 3.0 to 4.0 is re-used with new vanadium slag and an equal amount of mixed Secondary extraction of ethylene glycol ether and triethanolamine mixed solution to obtain vanadyl sulfate solution for use;

[0014] Step (2): adding hydrazine hydrate 7 to 9 times the amount required for divalent oxide reduction to the vanadyl sulfate solution extracted in step (1);

[0015] Step (3): According to the ratio of parts by weight, mix HDEHP: tributyl phosphate: sulfonated kerosene at a ratio of 5 to 15: 3 to 5: 20 to 30 to make an extraction agent, and compare O / A = 4: 1 , the extraction time is 30min, and the vanadyl sulfate solution prepared in step (2) is subjected to...

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Abstract

The invention relates to a method for preparing a vanadyl sulfate electrolyte by hydrazine hydrate / oxalic acid reduction. According to the method for preparing the vanadyl sulfate electrolyte by hydrazine hydrate / oxalic acid reduction, the high-purity vanadyl sulfate electrolyte is prepared by the following steps: extracting a vanadyl sulfate solution; inorganically reducing the vanadyl sulfate solution; preparing a mixed extractant; carrying out back extraction on vanadyl sulfate; organically reducing a vanadyl sulfate back-extraction liquid; concentrating a vanadyl sulfate electrolyte precursor; and the like. The method for preparing the vanadyl sulfate electrolyte by hydrazine hydrate / oxalic acid reduction is simple in process, low in cost and widely suitable for mass production of the vanadyl sulfate electrolyte for an all-vanadium battery.

Description

technical field [0001] The invention relates to a method for preparing vanadyl sulfate electrolyte by reducing hydrazine hydrate / oxalic acid. Background technique [0002] Vanadium redox flow battery (VRB) is an excellent energy storage device. The capacity of the battery depends on the amount of electrolyte and the concentration of vanadium ions. The electrolyte can be placed separately from the battery. The battery has a long service life, high reliability, and can be quickly charged and discharged. It has great development prospects in photovoltaic power generation, wind power generation, peak shaving and valley filling. VRB batteries have no solid-state reaction, no change in the structure and form of electrode materials, and are cheap, safe and environmentally friendly, and low in operation and maintenance costs. A VRB battery consists of two electrolyte pools and layers of battery cells. The electrolyte cells are used to hold two different electrolytes, and each ele...

Claims

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Application Information

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IPC IPC(8): H01M8/18
CPCH01M8/188H01M2300/0011Y02E60/50
Inventor 王晓伟
Owner 王晓伟