Green Recovery Method of Expired Palladium Catalyst
A recovery method, palladium catalyst technology, applied in the direction of improving process efficiency, etc., can solve problems such as polluting the environment, increasing the cost of palladium refining, and difficulty in dissolving palladium sulfide, achieving energy-saving environment, improving dissolution rate and recovery rate, and high production efficiency Effect
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Embodiment 1
[0033] The green recovery method of spent palladium catalyst is carried out in sequence as follows:
[0034] A. Crushing ball mill:
[0035] The invalid Pd / Al in the form of pellets or strips with a palladium content of 1000ppm 2 o 3 The catalyst is ground to 40 mesh;
[0036] B. Dissolving:
[0037] Put 1200 liters of industrial hydrochloric acid with a concentration of 3mol / L into the enamel kettle, stir at a stirring speed of 50 rpm, slowly put 300 kg of the crushed and ground material in step A into the enamel kettle, heat to 80°C, and start to drop Sodium chlorate solution, the amount of sodium chlorate added dropwise is 1.5 kilograms, after the sodium chlorate solution is added dropwise, continue to react for 4 hours, stop heating, after cooling to room temperature, filter; repeat the above dissolution process to dissolve the filter residue once more, filter 2 times containing palladium filtrate merged; The content of insoluble filter residue palladium 20ppm;
[003...
Embodiment 2
[0050] The green recovery method of spent palladium catalyst is carried out in sequence as follows:
[0051] A. Crushing ball mill:
[0052] The invalid Pd / Al in the form of pellets or strips with a palladium content of 2246ppm 2 o 3 The catalyst is ground to 50 mesh;
[0053] B. Dissolving:
[0054]Put 1,200 liters of industrial hydrochloric acid with a concentration of 3mol / L into the enamel kettle, stir at a stirring speed of 60 rpm, slowly put 300 kg of the crushed and ground material in step A into the enamel kettle, heat to 85°C, and start adding dropwise Sodium chlorate solution, the amount of sodium chlorate added dropwise is 5.39 kilograms, after the sodium chlorate solution is added dropwise, continue to react for 4.5 hours, stop heating, after cooling to room temperature, filter; repeat the above dissolution process to dissolve the filter residue once more, filter 2 times containing palladium filtrate merged; The content of insoluble filter residue palladium 35p...
Embodiment 3
[0067] The green recovery method of spent palladium catalyst is carried out in sequence as follows:
[0068] A. Crushing ball mill:
[0069] The invalid Pd / Al in the form of pellets or strips with a palladium content of 3168ppm 2 o 3 The catalyst is ground to 60 mesh;
[0070] B. Dissolving:
[0071] Put 1200 liters of industrial hydrochloric acid with a concentration of 4mol / L into the enamel kettle, stir at a stirring speed of 70 rpm, slowly put 300 kg of the crushed and ground material in step A into the enamel kettle, heat to 85°C, and start to add dropwise Sodium chlorate solution, the amount of sodium chlorate added dropwise is 9.5 kilograms, after the sodium chlorate solution is added dropwise, continue to react for 5 hours, stop heating, after cooling to room temperature, filter; repeat the above dissolution process to dissolve the filter residue once more, filter 2 times containing palladium filtrate merged; The content of insoluble filter residue palladium 60ppm;...
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