A method for recovering valuable metals in copper-containing waste catalysts
A waste catalyst and valuable metal technology, which is applied in the field of leaching of valuable metals in a waste catalyst system, can solve the problems of low recovery rate of metallic chromium, secondary pollution, complicated process, etc. Easy-to-control effects
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Embodiment 1
[0029] This embodiment relates to a method for efficient leaching of metal Cu and Cr in a waste copper-chromium series catalyst, comprising the following steps:
[0030] (1) Take a certain amount of deactivated copper-chromium catalyst, crush it into powder in a pulverizer, and then sieve it with a standard sieve with an aperture not greater than 0.5 mm.
[0031] (2) Weigh the catalyst powder in step (1), place it in a microwave oven, and activate it at a temperature of 200° C. for 60 minutes.
[0032] (3) use the sulfuric acid solution that concentration is 9M to leaching copper and chromium in step (2) catalyst, control liquid-solid mass ratio to be 4:1, leaching temperature is 70 ℃, and leaching time is 2h, then mixed solution is carried out Suction filtration, the pore size of the filter membrane used in the suction filtration process is 15-20 μm, and the leaching solution containing Cu and Cr is obtained, and the leaching rates of Cu and Cr are calculated to be 96.67% and...
Embodiment 2
[0034] This embodiment relates to a method for efficient leaching of metal Cu and Cr in a waste copper-chromium series catalyst, comprising the following steps:
[0035] (1) Take a certain amount of deactivated copper-chromium catalyst, crush it into powder in a pulverizer, and then sieve it with a standard sieve with an aperture not greater than 0.5 mm.
[0036] (2) Weigh the catalyst powder in step (1), place it in a microwave oven, and activate it at a temperature of 250° C. for 120 min.
[0037] (3) The copper and chromium in the catalyst of step (2) are leached using a sulfuric acid solution with a concentration of 6M, and the liquid-solid mass ratio is controlled to be 6:1, the leaching temperature is 70°C, and the leaching time is 3h, and then the mixed solution is Suction filtration, the pore size of the filter membrane used in the suction filtration process is 15-20 μm, and the leaching solution containing Cu and Cr is obtained, and the leaching rates of Cu and Cr are...
Embodiment 3
[0039] This embodiment relates to a method for efficient leaching of metal Cu and Cr in a waste copper-chromium series catalyst, comprising the following steps:
[0040] (1) Take a certain amount of deactivated copper-chromium catalyst, crush it into powder in a pulverizer, and then sieve it with a standard sieve with an aperture not greater than 0.5 mm.
[0041] (2) Weigh the catalyst powder in step (1), place it in a microwave oven, and activate it at a temperature of 300° C. for 60 minutes;
[0042] (3) use the nitric acid solution that concentration is 6M to leaching copper and chromium in step (2) catalyst, control liquid-solid mass ratio to be 6:1, leaching temperature is 80 ℃, and leaching time is 4h, then mixed solution is carried out Suction filtration, the pore size of the filter membrane used in the suction filtration process is 15-20 μm, and the leaching solution containing Cu and Cr is obtained, and the leaching rates of Cu and Cr are calculated to be 93.51% and 9...
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Abstract
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