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Method for regenerating alkaline solutions

A technology of solution and mother liquor, applied in the direction of alkaline electrolyte, regeneration of useful parts, chemical instruments and methods, etc., can solve problems such as not allowing robust removal

Active Publication Date: 2017-04-19
PHINERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In many cases, the particle size and morphology of the ATH precipitate do not allow its robust removal from the electrolyte flow at the desired rate

Method used

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  • Method for regenerating alkaline solutions
  • Method for regenerating alkaline solutions

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Experimental program
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Effect test

example

[0066] Material

[0067] Spent electrolyte samples were obtained from aluminum-air batteries. To this end, a fresh electrolyte solution consisting of aqueous KOH (30% by weight) was allowed to circulate at a flow rate of 6 L / min through an aluminum / air battery consisting of 10 cells until K[Al(OH) 4 ] The concentration of the solution is 140-180g / liter (calculated as metal aluminum).

[0068] method

[0069] The aluminum and alkali content of the solution was titrated by a double complexing agent operation originally developed by Watts and Utley [Anal. Chem. 28, 1731 (1956)] and improved by Metrohm AG ["Determination of total caustic, total soda and aluminum in Bayer process liquors with 859 Titrotherm”, Application Note 313e, METROHM AG]. Titration analysis with the help of Metrohm Tiamo TM The Metrohm 859 Titrotherm unit operated under the software was performed.

[0070] Powder x-ray diffraction (XRD) patterns were recorded using a BRUKER D8 ADVANCE X-ray Powder Di...

example 1

[0073] Hydrolysis of Spent Electrolyte - Liquid Phase Composition of Treated and Untreated Electrolyte

[0074] The following experiments were performed to demonstrate the effect of water addition on spent electrolyte solutions of aluminum-air batteries.

[0075] In a first experiment (comparative, untreated), 100 ml of spent electrolyte solution with 147 g / L aluminate (as Al) was added to a plastic tank. The jars were closed and allowed to stand at room temperature for a period of approximately 180 hours.

[0076] In a second experiment (water treated), 100ml of the same spent electrolyte solution (147g / L dissolved Al) was added to a plastic tank followed by water (40ml). The solution thus formed was stirred for two hours. The jars were closed and allowed to stand at room temperature for a period of approximately 180 hours.

[0077] During the 180-hour storage period, samples of both K[Al(OH) 4 ] solution and measure the concentration of aluminum dissolved in the aqueou...

example 2

[0082] Hydrolysis of Spent Electrolyte - Solid Phase Characterization

[0083] As shown in Example 1, after water addition, in K[Al(OH) 4 ] The white precipitate formed in the solution was isolated by filtration. XRD analysis indicated that the isolated solid was aluminum hydroxide in the form of gibbsite (sometimes called gibbsite). Figure 6 The X-ray powder diffraction pattern of the product is shown. The particle size distribution of the aluminum hydroxide thus formed is in the Figure 7 As described in , the indicated particle size is in the range of 1 to 10 μm.

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Abstract

This invention relates to the regeneration of spent alkaline solutions, for example, alkaline electrolyte solutions used in metal / air batteries, specifically in aluminum / air batteries. The invention provides methods and systems to regenerate alkaline electrolyte solutions by adding water and optionally other solvents to spent electrolyte solutions, thus precipitating metal hydroxides from the spent electrolyte solution.

Description

technical field [0001] The present invention relates to the regeneration of spent alkaline solutions, such as alkaline electrolyte solutions used in metal / air batteries, especially aluminum / air batteries. Background technique [0002] In its most general form, the operation of a metal / air electrochemical cell is based on the reduction of oxygen, which occurs at the cathode, and the oxidation of the metal anode. The ionically conductive electrolyte fills the space between the battery's electrodes (cathode and anode), closing (along with the external load) the electrochemical circuit. [0003] A typical structure of a metal / air battery is schematically shown in figure 1 , where the air cathode, consumable metal anode, and electrolyte are shown. These components (cathode, anode and electrolyte) are described in more detail below. [0004] A commonly used air cathode consists of a porous layer of active electrolyte particles (the layer facing the electrolyte) and a gas diffus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M12/06H01M6/50C01D1/28
CPCC01D1/28C01D1/32H01M10/4242H01M6/52H01M10/54H01M2300/0014Y02W30/84C01F7/14C01G9/02H01M6/5077Y02E60/10C01D1/34H01M12/06
Inventor I·亚库波夫A·达尼诺
Owner PHINERGY
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