Method for leaching positive-negative pole material mixture of waste nickel-metal hydride battery
A technology of waste nickel-hydrogen batteries and mixed materials, applied in the direction of improving process efficiency, etc., can solve the problems of uneconomical industrial pure oxygen for personal use, complicated leaching equipment, and small amount of industrial pure oxygen, etc., and achieve obvious economic and environmental benefits , Reduce the cost of pollution control, improve the effect of metal leaching rate
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Embodiment 1
[0022] Example 1: Add 100 g of the positive and negative mixed materials of nickel-metal hydride waste batteries (containing 55.3% nickel, 6.2% cobalt, and 12.5% rare earth) and 37 g of distiller grains ≤ 1.5 mm into a titanium-lined pressure reactor with a volume of 2 L. Add 870ml of mixed acid solution with a concentration of sulfuric acid of 1.5mol / L and a concentration of nitric acid of 5g / L, leaching at 50°C to 60°C with airtight stirring (stirring speed 80r / min) for 4 hours, 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%, 98.3% and 8.8% respectively (calculated based on nickel, cobalt and rare earths entering the leaching solution and leaching slag washing solution).
Embodiment 2
[0023] Example 2: Add 500 g of mixed positive and negative electrode materials of spent Ni-MH batteries (containing 55.3% nickel, 6.2% cobalt, and 12.5% rare earth) and 230 g distiller grains ≤ 1.5 mm into a titanium-lined pressure reactor with a volume of 5 L. Add 2700ml of a mixed acid solution with a concentration of sulfuric acid of 3.0mol / L and a concentration of nitric acid of 10g / L, leaching at 70°C to 80°C (stirring speed 70r / min) for 2.0h, and then carry out liquid-solid separation. Obtain 2400ml leaching solution (excluding leaching slag washing water). The leaching rates of nickel, cobalt and rare earths are 99.6%, 99.2% 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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