Method for recycling metal oxide from waste flue gas denitration catalyst
A denitration catalyst and waste flue gas technology, which is applied in the field of non-ferrous metal recovery, can solve the problems such as comprehensive recovery of waste SCR flue gas denitration catalysts that cannot be used, and achieve the effects of rapid recycling, cost reduction and simple process
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[0046] Example 1: Such as figure 1 Shown: In this embodiment, the method for recovering metal oxides from waste flue gas denitration catalysts is carried out according to the following steps.
[0047] Raw material pre-roasting: Take the spent honeycomb-type waste flue gas denitration catalyst and put it into the rotary kiln, and perform high-temperature roasting at about 650 ℃ to remove the Hg, As and organic impurities that may be adsorbed on the surface. The temperature is kept constant for 4 hours.
[0048] Mixing and crushing: add Na to the roasted waste flue gas denitration catalyst 2 CO 3 , Na 2 CO 3 And waste flue gas denitration catalyst (according to TiO 2 The molar ratio is 2:1. After being fully mixed by the mixer, it is put into the crusher to be crushed and milled to a particle size ≤200 μm to obtain a mixed powder.
[0049] Sodium roasting: Put the mixed and crushed powder into a rotary kiln for high-temperature roasting at 650-700 ℃, and keep it constant for 4 hours. ...
Example Embodiment
[0054] Example 2: Such as figure 1 Shown: In this embodiment, the method for recovering metal oxides from waste flue gas denitration catalysts is carried out according to the following steps.
[0055] Raw material pre-roasting: Take the spent honeycomb-type waste flue gas denitration catalyst and put it into the rotary kiln, and perform high-temperature roasting at about 650 ℃ to remove the Hg, As and organic impurities that may be adsorbed on the surface. The temperature is kept for 3 hours.
[0056] Mixing and crushing: add Na to the roasted waste flue gas denitration catalyst 2 CO 3 , Na 2 CO 3 And waste flue gas denitration catalyst (according to TiO 2 The molar ratio is 2.5:1. After being fully mixed by the mixer, it is put into the crusher to be crushed and milled to a particle size ≤200 μm to obtain a mixed powder.
[0057] Sodium roasting: Put the mixed and crushed mixed powder into the rotary kiln for high-temperature roasting at 650-700 ℃, and keep it constant for 5 hours. ...
Example Embodiment
[0062] Example 3: Such as figure 1 Shown: In this embodiment, the method for recovering metal oxides from waste flue gas denitration catalysts is carried out according to the following steps.
[0063] Raw material pre-roasting: Take the spent honeycomb-type waste flue gas denitration catalyst and put it into the rotary kiln, and perform high-temperature roasting at about 650 ℃ to remove the Hg, As and organic impurities that may be adsorbed on the surface. The temperature is kept for 2 hours.
[0064] Mixing and crushing: add Na to the roasted waste flue gas denitration catalyst 2 CO 3 , Na 2 CO 3 And waste flue gas denitration catalyst (according to TiO 2 The molar ratio is 3:1. After being fully mixed by the mixer, it is put into the crusher to be crushed and milled to a particle size ≤200 μm to obtain a mixed powder.
[0065] Sodiumized roasting: Put the mixed and crushed mixed powder into a rotary kiln for high-temperature roasting at 650-700 ℃, and hold it at a constant temperat...
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