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

Active Publication Date: 2010-12-22
HUADIAN ELECTRIC POWER SCI INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it should be pointed out that most of the currently retrieved waste catalyst recovery process patents are for hydrodesulfurization catalysts in the petrochemical field. The use of catalysts in these two fields, the composition and properties of impurities are quite different, and these methods cannot Application in comprehensive recovery of waste SCR flue gas denitrification catalyst

Method used

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Embodiment 1

[0046] Embodiment 1: as figure 1 Shown: the method for recovering metal oxides from waste flue gas denitrification catalyst in this embodiment is carried out according to the following steps.

[0047] Pre-roasting of raw materials: Take the expired honeycomb waste flue gas denitrification catalyst and put it into the rotary kiln, and perform high-temperature roasting at about 650 ℃ to remove Hg, As and organic impurities that may be adsorbed on the surface, and keep the temperature for 4 hours.

[0048] Mixing and crushing: adding Na to the roasted waste flue gas denitrification catalyst 2 CO 3 , Na 2 CO 3 and waste flue gas denitrification catalyst (by TiO 2 The molar ratio of the powder is 2:1. After being fully mixed by a mixer, it is put into a crusher for crushing and grinding until the particle size is ≤200 μm to obtain a mixed powder.

[0049] Sodium roasting: Put the mixed and crushed mixed powder into the rotary kiln for high-temperature roasting at 650-700 °C, a...

Embodiment 2

[0054] Embodiment 2: as figure 1 Shown: the method for recovering metal oxides from waste flue gas denitrification catalyst in this embodiment is carried out according to the following steps.

[0055] Pre-roasting of raw materials: Take the expired honeycomb waste flue gas denitrification catalyst and put it into the rotary kiln, and perform high-temperature roasting at about 650 ℃ to remove Hg, As and organic impurities that may be adsorbed on the surface, and keep the temperature for 3 hours.

[0056] Mixing and crushing: adding Na to the roasted waste flue gas denitrification catalyst 2 CO 3 , Na 2 CO 3 and waste flue gas denitrification catalyst (by TiO 2 The molar ratio is 2.5:1. After being fully mixed by a mixer, it is put into a crusher for crushing and grinding until the particle size is ≤200 μm to obtain a mixed powder.

[0057]Sodium roasting: Put the mixed and pulverized mixed powder into a rotary kiln for high-temperature roasting at 650-700 °C, and keep the ...

Embodiment 3

[0062] Embodiment 3: as figure 1 Shown: the method for recovering metal oxides from waste flue gas denitrification catalyst in this embodiment is carried out according to the following steps.

[0063] Pre-roasting of raw materials: Take the expired honeycomb waste flue gas denitration catalyst and put it into the rotary kiln, and perform high-temperature roasting at about 650 ℃ to remove Hg, As and organic impurities that may be adsorbed on the surface, and keep the temperature constant for 2 hours.

[0064] Mixing and crushing: adding Na to the roasted waste flue gas denitrification catalyst 2 CO 3 , Na 2 CO 3 and waste flue gas denitrification catalyst (by TiO 2 The molar ratio of the powder is 3:1. After being fully mixed by a mixer, it is put into a crusher for crushing and grinding until the particle size is ≤200 μm to obtain a mixed powder.

[0065] Sodium roasting: Put the mixed and pulverized powder into the rotary kiln for high-temperature roasting at 650-700 °C,...

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Abstract

The invention discloses a method for recycling a metal oxide from a waste flue gas denitration catalyst, comprising the following steps of: crushing the waste flue gas denitration catalyst to carry out pre-roasting pretreatment at high temperature; adding Na2CO3 into the waste flue gas denitration catalyst according to the proportion, mixing, pulverizing and roasting at high temperature to obtain a sintering block; crushing the sintering block and putting the crushed sintering block into hot water, and stirring and lixiviating to obtain titanate; adding sulphuric acid into the titanate, filtering, water-washing and roasting to obtain TiO2; adding the sulphuric acid into the lixiviated filtering liquid to regulate a pH value to 8.0-9.0; adding excessive NH4Cl for vanadium precipitation; decomposing NH4VO3 obtained from filtering at high temperature to prepare a V2O5 product; adding hydrochloric acid into the filtering liquid subjected to the vanadium precipitation to regulate a pH value to 4.5-5.0; adding CaCl2 for molybdenum and tungsten precipitation; treating the CaM0O4 and CaWO4, obtained from filtering, with the hydrochloric acid and roasting to obtain MoO3 and WO3. The method of the invention has the advantages of simple process and apparatus, high recycling efficiency, good product technical data, large treatment capacity and the like.

Description

technical field [0001] The invention relates to a method for recovering metal oxides from waste flue gas denitrification catalysts, and belongs to the technical field of non-ferrous metal recovery. Background technique [0002] Selective catalytic reduction (SCR) flue gas denitrification technology has become a coal-fired flue gas and flue gas denitrification technology because of its advantages such as high denitrification rate, low price, almost no secondary pollution and small limitations of flue gas components. and other nitrogen oxides (NO x ) removal of the mainstream technology. At present, the most widely used SCR flue gas denitrification catalyst is V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 type monolithic catalyst, the catalyst is based on TiO 2 as the carrier, V 2 o 5 、WO 3 and MoO 3 as the active ingredient. Generally, the TiO in the flue gas removal catalyst 2 The mass percentage is 85-90%, V 2 o 5 The mass percentage is 1~5%, WO 3 The mass percentage is 5-1...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B34/12C22B34/34C22B34/36C22B34/22
Inventor 朱跃何胜张扬
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD
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