Method for recycling rare earth from asymmetric capacitive type nickel-metal hydride battery
An asymmetric capacitor, nickel-metal hydride battery technology, applied in battery recycling, recycling technology, recycling by waste collectors, etc., can solve the problems of incomplete separation and long process flow, and achieve good leaching effect, good economy and cost. low effect
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Embodiment 1
[0048] (1) Take 10 g of anode materials for asymmetric capacitive nickel-hydrogen batteries, including nickel 52.3wt.%, cobalt 4wt.%, rare earth metals 12wt.%, and the rest are non-metals and impurities. The negative electrode material is crushed, and the particle size after crushing and sieving is 75 μm, and then the negative electrode material is dissolved in 10ml of a hypochlorous acid solution with a concentration of 5wt.%; stand at 25°C for 40 minutes, add 190g / L sulfuric acid solution, sulfuric acid solution and negative electrode material The mass ratio is 10:1; leaching at normal temperature and pressure for 20 minutes, and filtering to obtain leachate and filter cake. After testing, the leaching solution does not contain nickel and cobalt.
[0049] The composition content of the rare earth metals is lanthanum 61wt.%, cerium 32wt.%, praseodymium 1.2wt.%, scandium 0.8wt.%, and the rest are other rare earth metals.
Embodiment 2
[0053] (1) Take 10 g of anode materials for asymmetric capacitive nickel-hydrogen batteries, including nickel 52.3wt.%, cobalt 4wt.%, rare earth metals 12wt.%, and the rest are non-metals and impurities. The negative electrode material is crushed, and the particle size after crushing and sieving is 75 μm, and then the negative electrode material is dissolved in 8ml of a hypochlorous acid solution with a concentration of 10wt.%; stand at 30°C for 20 minutes, add 190g / L sulfuric acid solution, sulfuric acid solution and negative electrode material The mass ratio is 9:1; under normal pressure, leaching at 20°C for 20 minutes, and filtering to obtain leachate and filter cake. After testing, the leaching solution does not contain nickel and cobalt.
[0054] The composition content of the rare earth metals is lanthanum 61wt.%, cerium 32wt.%, praseodymium 1.2wt.%, scandium 0.8wt.%, and the rest are other rare earth metals.
[0055] (2) Gradually add solid sodium hydroxide to the lea...
Embodiment 3
[0058] (1) Take 10 g of anode materials for asymmetric capacitive nickel-hydrogen batteries, including nickel 52.3wt.%, cobalt 4wt.%, rare earth metals 12wt.%, and the rest are non-metals and impurities. The negative electrode material is crushed, the particle size is 75 μm after crushing and sieving, and then the negative electrode material is dissolved in 10ml of hypochlorous acid solution with a concentration of 7wt.%; stand at 25°C for 20 minutes, add 160g / L sulfuric acid solution, sulfuric acid solution and negative electrode material The mass ratio is 10:1; under normal pressure, leaching at 20°C for 20 minutes, and filtering to obtain leachate and filter cake. After testing, the leaching solution does not contain nickel and cobalt.
[0059] The composition content of the rare earth metals is lanthanum 61wt.%, cerium 32wt.%, praseodymium 1.2wt.%, scandium 0.8wt.%, and the rest are other rare earth metals.
[0060] (2) Gradually add solid sodium hydroxide to the leaching...
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