Efficient and environmentally friendly recovery of precious metal palladium from decommissioned solid oxide fuel cells

A solid oxide and fuel cell technology, which is applied in the direction of fuel cell disposal/recycling, battery recycling, recycling technology, etc., can solve problems such as resource waste, difficult to apply precious metal recovery fields, non-compliance, etc., to expand the scope of recycling, Ease of implementation and mild recovery conditions

Active Publication Date: 2022-06-03
WUHAN UNIV OF TECH
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  • Summary
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  • Claims
  • Application Information

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Problems solved by technology

[0003] However, as the use of solid oxide fuel cells is becoming more and more common and the degree of commercialization is getting higher and higher, the number of decommissioned solid oxide fuel cells is gradually increasing. If they are not recycled, it will cause serious waste of resources, especially in precious metal catalysts
However, today’s decommissioned battery recycling technology mainly focuses on proton exchange membrane fuel cells and lithium batteries, and most of them are recycling common metals such as Ni, Cu, Fe, Li, Mn, although the recycling process is gradually becoming more environmentally friendly and mature. , but it is difficult to apply to the recovery field of precious metals
Furthermore, for the recovery of precious metals, most of them are still in the stage of strong acid and strong alkali leaching and incineration, which is not in line with today's green and environmentally friendly development concepts. In addition, research on recovery from decommissioned solid oxide fuel cells is even more are very few, therefore, a kind of green environmental protection recovery process about decommissioned solid oxide fuel cells needs to be developed urgently

Method used

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  • Efficient and environmentally friendly recovery of precious metal palladium from decommissioned solid oxide fuel cells
  • Efficient and environmentally friendly recovery of precious metal palladium from decommissioned solid oxide fuel cells

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preparation example Construction

[0031] 4) [Hbet][Tf2N] ionic liquid is prepared by the following steps:

[0032] a. The betaine hydrochloride solution and the lithium bis-trifluoromethanesulfonimide aqueous solution were mixed and stirred at room temperature for 2 hours;

[0033] b. Separate the ionic liquid phase and wash it with distilled water several times until the silver nitrate test does not detect the formation of precipitation; after evaporation and drying, the [Hbet][Tf2N] ionic liquid is obtained; wherein, the betaine hydrochloride solution concentration is 4mol / L, the aqueous solution of lithium bistrifluoromethanesulfonimide is 2mol / L;

[0034] 5) placing the filter residue obtained in step 3) in the prepared [Hbet][Tf2N] ionic liquid, and leaching at a temperature of 85-95° C. to obtain a leaching solution;

[0035] 6) The leaching solution obtained in step 5) is used as the electrolyte, and the glassy carbon electrode is used as the working electrode, the glassy carbon electrode as the count...

Embodiment 1

[0039] like figure 1 The illustrated method for the efficient and environmentally friendly recovery of precious metal palladium from decommissioned solid oxide fuel cells includes the following steps:

[0040] Ⅰ. Disassemble the decommissioned solid oxide fuel cell with Pd as cathode, Cu-GDC as anode and GDC as electrolyte to obtain a single cell structure, put it in a pulverizer and pulverize for 5-10 minutes, and then pulverize the The powder is soaked in octylphenol polyoxyethylene (9-10) ether (TX-10) with a mass fraction of 3% for more than 24 hours, and is stirred from time to time. Heat to boiling for 20 minutes, and remove the organic layer while hot. Filter and wash, and put the filter residue into an oven for drying.

[0041] Ⅱ. Put the dried powder in a clean and dry porcelain crucible, and lightly burn it in a muffle furnace for 1 hour at a temperature of 400°C. After washing and filtering, the powder was placed in a deep eutectic solvent made of choline chlorid...

Embodiment 2

[0046] like figure 2The high-efficiency, environmentally friendly recovery method of precious metal palladium in the shown decommissioned solid oxide fuel cell, its steps are similar to the steps of embodiment 1, and its difference is:

[0047] 1. The heating and boiling time in step I is 30 minutes.

[0048] 2. In step II, the temperature of light burning in the muffle furnace is 500°C, and the used deep eutectic solvent is choline chloride-ethylene glycol.

[0049] 3. In step IV IV, the potential window is set to -0.5-1.4V, and the scan rate is 50mV / L.

[0050] 4. The rotational speed of the centrifuge device in step V is 5000 r / min.

[0051] The idea and method for separating and recovering precious metal Pd in ​​a decommissioned solid oxide fuel cell proposed by the present invention are simple in process and easy to implement. Based on the leaching of metal oxides by the green functionalized ionic liquid [Hbet][Tf2N], the electrodeposition of Pd by making full use of ...

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Abstract

The invention discloses an efficient and environment-friendly recovery method for precious metal palladium in decommissioned solid oxide fuel cells. In the method, decommissioned solid oxide fuel cells are disassembled and crushed, and then placed in octylphenol polyoxyethylene ether to remove organic substances, washed After drying; the powder obtained in the previous step is lightly burned, and soaked in a deep eutectic solvent for a period of time, filtered, and the filter residue is washed with distilled water several times; the filter residue is placed in the prepared [Hbet][Tf2N] The leaching of Pd is carried out in the ionic liquid; after the leaching is completed, a three-electrode system is constructed with the leaching solution as the electrolyte for the electrodeposition of Pd. After the deposition is completed, the deposition solution is placed in a centrifugal device to separate Pd, and it can be washed and dried. Elemental Pd was obtained. The invention avoids a large amount of use of acid and alkali, and can recover and obtain relatively high-purity noble metal Pd on the basis of simple process and environmental protection.

Description

technical field [0001] The invention relates to the technical field of recycling and processing of decommissioned batteries, in particular to an efficient and environmentally friendly recovery method of precious metal palladium in decommissioned solid oxide fuel cells. Background technique [0002] With the development of the times, the whole society consumes more and more energy, and people have to focus on cleaner new energy technologies. Among them, fuel cells have attracted people's attention with their excellent performance characteristics. For solid oxide fuel cell (SOFC), its all-solid-state cell structure makes it free from any electrolyte leakage problem, and SOFC directly converts chemical energy into electrical energy, which is not limited by the Carnot cycle, and has a high energy conversion efficiency. Coupled with the advantages of low emission and low noise, it has broad application prospects in the field of new energy vehicles. [0003] However, as the use ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/00C22B11/00C25C3/34H01M8/008
CPCC22B7/006C22B1/005C22B11/046C25C3/34H01M8/008Y02W30/84
Inventor 刘毅辉刘秋彤王超
Owner WUHAN UNIV OF TECH
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