Method for leaching positive pole material of waste nickel-metal hydride battery
A nickel-hydrogen waste battery and positive electrode material technology, applied in the direction of improving process efficiency, can solve the problems of uneconomical industrial pure oxygen for personal use, complex leaching equipment, and small amount of industrial pure oxygen, etc., and achieve obvious economic and environmental benefits , Reduce pollution control costs, improve the effect of metal leaching rate
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Embodiment 1
[0020] Example 1: Add 100g of waste nickel-metal hydride battery positive electrode material (containing 56.4% nickel, 5.9% cobalt) and 37.5g of ≤1.5mm corn cob powder into a titanium-lined pressure reactor with a volume of 2L, and add sulfuric acid at a concentration of 1.5mol / L. 850ml of mixed acid solution with a concentration of nitric acid of 5g / L, leaching for 4.0h under airtight stirring (stirring speed 80r / min) at 50°C to 60°C, and liquid-solid separation after leaching to obtain 820ml of leaching solution (without leaching residue wash water). The leaching rates of nickel and cobalt are 98.9% and 98.5% respectively (calculated based on nickel and cobalt entering the leaching solution and leaching slag washing solution).
Embodiment 2
[0021] Example 2: Add 500g of waste nickel metal hydride battery cathode material (containing 56.4% nickel, 5.9% cobalt) and 230g of ≤1.5mm corn cob powder into a titanium-lined pressure reactor with a volume of 5L, and add sulfuric acid at a concentration of 3.0mol / L , 2500ml of mixed acid solution with a nitric acid concentration of 10g / L, leaching at 70°C to 80°C with closed stirring (stirring speed 70r / min) for 2.0h, and liquid-solid separation after leaching, to obtain 2300ml of leaching solution (excluding leaching residue washing water). The leaching rates of nickel and cobalt are 99.6% and 99.3% respectively (calculated based on nickel and cobalt entering the leaching solution and leaching slag washing solution).
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