Method for leaching positive-negative pole material mixture of waste nickel-metal hydride battery
A technology for nickel-hydrogen waste batteries and mixed materials, which is applied in the direction of improving process efficiency, can solve the problems of uneconomical self-use of industrial pure oxygen, complicated leaching equipment, and small amount of industrial pure oxygen, etc., and achieves obvious economic and environmental benefits. , the effect of reducing pollution control costs and improving metal leaching rate
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Embodiment 1
[0022] Example 1: Add 100g of the positive and negative mixed material of nickel-metal hydride waste batteries (containing 55.3% nickel, 6.2% cobalt, and 12.5% rare earth) and 37g ≤ 1.5mm corn cob powder into a titanium-lined pressure tank with a volume of 2L. In the reaction kettle, add 870ml of mixed acid solution with a sulfuric acid concentration of 1.5mol / L and a nitric acid concentration of 5g / L, and leaching at 50°C to 60°C (stirring speed 80r / min) for 4 hours in a closed manner, and then carry out liquid-solid separation after leaching , to obtain 840ml leaching solution (excluding leaching slag washing water). The leaching rates of nickel, cobalt and rare earths are 99.1%, 98.6% and 8.6% respectively (calculated based on nickel, cobalt and rare earths entering the leaching solution and leaching slag washing solution).
Embodiment 2
[0023] Example 2: 500g of mixed positive and negative electrode materials of waste nickel-metal hydride batteries (containing 55.3% nickel, 6.2% cobalt, and 12.5% rare earth) and 230g of ≤ 1.5mm corn cob powder were added to a titanium-lined pressure tank with a volume of 5L. In the reaction kettle, add 2700ml of a mixed acid solution with a sulfuric acid concentration of 3.0mol / L and a nitric acid concentration of 10g / L, and leaching with closed stirring (stirring speed 70r / min) at 70°C to 80°C for 2.0h. After leaching, liquid-solid Separate to obtain 2400ml leaching solution (excluding leaching slag washing water). The leaching rates of nickel, cobalt and rare earths are 99.6%, 99.4% and 7.7% respectively (calculated based on nickel, cobalt and rare earths entering the leaching solution and leaching slag washing solution).
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