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Two-stage extraction preparation method for high-purity vanadyl sulfate solution

A vanadyl sulfate extraction technology, applied in liquid solution solvent extraction, final product manufacturing, sustainable manufacturing/processing, etc., can solve the problems of high impurity content and inclusions in vanadium electrolyte, reduce production costs, and improve product quality. performance effect

Inactive Publication Date: 2014-01-15
NO 63971 TROOPS PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods adopt the hydrolysis method of tetravalent vanadium to separate vanadium from the vanadium stock solution, and the tetravalent vanadic acid is colloidal precipitation with more inclusions, so the impurity content of the vanadium electrolyte obtained by this method should still be relatively high

Method used

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  • Two-stage extraction preparation method for high-purity vanadyl sulfate solution
  • Two-stage extraction preparation method for high-purity vanadyl sulfate solution
  • Two-stage extraction preparation method for high-purity vanadyl sulfate solution

Examples

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Effect test

example 1

[0021] In 10 liters of standard vanadium liquid, the concentration of vanadium is 0.4M, and impurities include silicate, chromate, and phosphate, and cations include iron, calcium, magnesium, and manganese ions.

[0022] 1. Remove impurities

[0023] Silicon removal: Take 10 liters of the stock solution, adjust the pH of the stock solution to 9, add aluminum sulfate (according to the ratio of Si:Al=1:1.2), and keep the pH of the stock solution at 9 during stirring for 2 hours. After standing for 12 h, the precipitate was filtered.

[0024] Calcium removal: add sodium carbonate (according to Ca:CO 3 2- =1:1 ratio), adjust the pH of the filtrate to 11, heat to 100 degrees and then cool slowly, let stand for 12h, and filter the precipitate.

[0025] 2. Alkaline extraction

[0026] 10 liters of vanadium solution is extracted with 2 liters of extractant (the ratio of extractant is Alamin304: kerosene=4: 6), the extraction process time is 20 minutes, and the extract is back-extr...

example 2

[0034] In 10 liters of standard vanadium solution, the concentration of vanadium is 0.6M, and impurities include silicate, chromate, and phosphate, and cations include iron, calcium, magnesium, and manganese ions.

[0035] 1. Remove impurities

[0036] Silicon removal: Take 10 liters of the stock solution, adjust the pH of the stock solution to 9, add aluminum sulfate (according to the ratio of Si:Al=1:1.2), and keep the pH of the stock solution at 9 during stirring for 2 hours. After heating to 100°C, cool slowly, and after standing for 12 hours, filter the precipitate.

[0037] Calcium removal: add sodium carbonate (according to Ca:CO 3 2- =1:1 ratio), adjust the pH of the filtrate to 11, heat to 100 degrees and then cool slowly, let stand for 12h, and filter the precipitate.

[0038] 2. Alkaline extraction

[0039] 10 liters of vanadium solution is extracted with 2 liters of extractant (the ratio of extractant is Alamin304: kerosene=4: 6), the extraction process time is...

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Abstract

The invention relates to a two-stage extraction preparation method for a high-purity vanadyl sulfate solution, and is characterized in that the method comprises a series of steps: employing a qualified pentavalent vanadium solution produced by a vanadium factory, after purification by an initial impurity removal process, extracting pentavalent vanadium by an amine extractant, reducing pentavalent vanadium into tetravalent vanadium by adding a reductant, and extracting tetravalent vanadium by an acid extractant; the high-purity tetravalent vanadyl sulfate solution is prepared directly from the pentavalent sodium vanadate solution without a solid state process. The high-purity and high-concentration vanadyl sulfate electrolyte solution with the concentration of 1-4 M is obtained. The method adopts the qualified pentavalent vanadium solution as the raw material, the consumed reagents in the preparation process are commonly used, and the price is low; the extractants applied in the preparation process can be repeatedly used, and thus the cost is low; and the method has the advantages of simple preparation steps and mild reaction conditions, requires no high temperature, and enables the obtained electrolyte solution to have high purity.

Description

technical field [0001] The invention relates to the field of preparation of an all-vanadium redox flow battery electrolyte, in particular to the field of preparation of a pentavalent qualified vanadium liquid produced by a vanadium plant to a quadrivalent electrolyte of a redox flow battery. Background technique [0002] Liquid flow batteries are developed from fuel cells. Since the concept was proposed in 1974, they have attracted widespread attention due to their many unique properties. Different from the solid-state active material contained in the anode and cathode of the usual battery, the high and low potential two oxidation-reduction couples used as the active material in the flow battery, two or one of them are dissolved in the liquid storage tank In solution, the solution is pumped through the cell, where oxidation and reduction reactions take place on inert solid electrodes. The flow battery is divided into three layers: single cell (Cell), stack (Stack) and syste...

Claims

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Application Information

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IPC IPC(8): B01D11/04H01M8/18
CPCY02E60/50Y02P70/50
Inventor 徐艳文越华程杰杨裕生曹高萍
Owner NO 63971 TROOPS PLA
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