Leaching method of nickel-cadmium waste battery positive-negative electrode mixed material
A technology of mixed materials and positive and negative electrodes, which is applied in the field of leaching mixed positive and negative electrodes of nickel-cadmium waste batteries, can solve the problems of industrial pure oxygen storage, transportation and use, uneconomical industrial pure oxygen for personal use, and insufficient amount of industrial pure oxygen Major problems, achieving obvious economic and environmental benefits, reducing pollution treatment costs, and improving the metal leaching rate
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Embodiment 1
[0021] Example 1: Add 100g of nickel-cadmium waste battery positive and negative mixed materials (containing 30.5% nickel, 1.6% cobalt, and 28.1% cadmium) and 19.5g wheatgrass powder ≤ 1.5mm into a titanium-lined pressure reactor with a volume of 1L, and add 590ml of mixed acid solution with a sulfuric acid concentration of 1.5mol / L and a nitric acid concentration of 5g / L was stirred at 50°C to 60°C (stirring speed 80r / min) for 4 hours, and liquid-solid separation was carried out after the leaching was completed to obtain 560ml of leaching solution ( Does not contain leach residue wash water). The leaching rates of nickel, cobalt and cadmium are 99.1%, 98.5% and 99.3% respectively (calculated based on nickel, cobalt and cadmium entering the leaching solution and leaching slag washing solution).
Embodiment 2
[0022] Example 2: 500g of waste nickel-cadmium battery positive and negative mixed materials (containing 30.5% nickel, 1.6% cobalt, and 28.1% cadmium) ≤ 1.5mm wheat straw powder 120g was added to a titanium-lined pressure reactor with a volume of 5L, and the concentration of sulfuric acid was added. 2200ml mixed acid solution of 2.5mol / L and nitric acid concentration of 10g / L, stirred at 70°C to 80°C (stirring speed 70r / min) for 2h, liquid-solid separation after leaching, to obtain 2000ml leaching solution ( The leaching rates of nickel, cobalt and cadmium are 99.3%, 99.1% and 99.4% respectively (calculated based on nickel, cobalt and cadmium entering the leaching solution and leaching residue washing solution).
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