A kind of recovery method of palladium in deactivated palladium carbon catalyst
A technology of palladium carbon catalyst and recovery method, which is applied in the direction of improving process efficiency, etc., can solve the problems of recovery rate of polluted environment, high recovery cost, and complicated steps, and achieve the effect of low recovery cost, high recovery efficiency and cheap reagents
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Embodiment 1
[0030] (1) Crushing and sintering
[0031] Mix pure water with a mass ratio of 1:1 and deactivated palladium-carbon catalyst, stir and make a slurry, then place it in a colloid mill and pulverize and centrifuge to obtain a filter residue. Wash the filter residue with pure water to obtain palladium with a particle size of 1 micron. Carbon catalyst particles; the palladium-carbon catalyst particles and nano SiO 2 Mix according to the mass ratio of 20:1, stir evenly, sinter at a high temperature at 600°C for 4 hours, and cool to room temperature to obtain a sintered residue.
[0032] (2) Oxidation and dissolution
[0033] Preparation of ozone mixed gas: the concentration of ozone in the ozone mixed gas is 10mg / m 3 .
[0034] Take the sintering residue and hydrochloric acid with a mass ratio of 0.10:1, slowly put the sintering residue in hydrochloric acid and stir evenly to obtain the reaction liquid; continue to pass the ozone mixed gas to the bottom of the reaction liquid for stirring a...
Embodiment 2
[0038] (1) Crushing and sintering
[0039] Mix pure water with a mass ratio of 1.5:1 and deactivated palladium-carbon catalyst, stir and make a slurry, then place it in a colloid mill and pulverize and centrifuge to obtain a filter residue. Wash the filter residue with pure water to obtain a palladium with a particle size of 0.9 microns Carbon catalyst particles; the palladium-carbon catalyst particles and nano SiO 2 Mix according to the mass ratio of 35:1, stir well and sinter at 700°C for 5h at a high temperature, and cool to room temperature to obtain a sintered residue.
[0040] (2) Oxidation and dissolution
[0041] Preparation of ozone mixed gas: the ozone concentration in the ozone mixed gas is 18mg / m 3 .
[0042] Take the sintered residue and hydrochloric acid with a mass ratio of 0.11:1, slowly put the sintered residue in hydrochloric acid and stir evenly to obtain a reaction liquid; continue to pass ozone mixed gas to the bottom of the reaction liquid for agitated aeration r...
Embodiment 3
[0046] (1) Crushing and sintering
[0047] Mix the purified water with a mass ratio of 2:1 with the deactivated palladium-carbon catalyst, stir and make the slurry, then place it in a colloid mill and pulverize and centrifuge to obtain the filter residue. Wash the filter residue with pure water to obtain palladium with a particle size of 0.8 microns. Carbon catalyst particles; the palladium-carbon catalyst particles and nano SiO 2 Mix according to the mass ratio of 50:1, stir evenly and sinter at a high temperature at 800°C for 6 hours, and cool to room temperature to obtain a sintered residue.
[0048] (2) Oxidation and dissolution
[0049] Preparation of ozone mixed gas: ozone concentration in ozone mixed gas is 20mg / m 3 .
[0050] Take the sintered residue and hydrochloric acid with a mass ratio of 0.12:1, slowly put the sintered residue in hydrochloric acid and stir evenly to obtain the reaction solution; continue to inject the ozone mixed gas to the bottom of the reaction solutio...
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