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Separating and recovering method for W and V in waste SCR denitration catalyst

A technology of denitration catalyst and recovery method, which is applied in the field of recovery and separation of metal tungsten and vanadium in waste SCR denitration catalyst, which can solve the problems of inability to achieve efficient metal separation, cumbersome operation process, and low metal leaching rate

Active Publication Date: 2016-10-26
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Among the above methods, Chinese patent CN105200236A, Chinese patent CN104611564A, and Chinese patent CN101921916A all use chemical precipitation to separate and recover metals from the leaching solution of spent SCR catalysts. The cost is low, but the operation process is cumbersome, and the metal leaching rate in the catalyst is generally low. The recovery rate of metals is low, and the efficient separation of valuable metals such as V, W and Ti cannot be achieved and high-purity metal products can be obtained

Method used

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  • Separating and recovering method for W and V in waste SCR denitration catalyst
  • Separating and recovering method for W and V in waste SCR denitration catalyst

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Experimental program
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Effect test

Embodiment 1

[0058] a Take a waste SCR denitrification catalyst (the main component is V 2 o 5 -WO 3 / TiO 2 , the specific components are shown in Table 1), the deactivated SCR denitrification catalyst is blown with clean and dry compressed air to remove the fly ash deposited on the surface of the catalyst, wherein the working pressure of the compressed air is 0.5MPa, and the gas flow rate is 0.5m 3 / s, the purge time is 10min. Grind the catalyst into powder in a mortar, and then sieve it with a standard sieve of not less than 100 meshes, and then dry the catalyst powder at 105°C for 2 hours.

[0059] B takes by weighing the catalyst powder 5g that dries in step a, after cooling, adds Na to wherein 2 CO 3 solid, Na 2 CO 3 The mass ratio of the mixture to the catalyst is 0.5, and after being fully mixed, it is placed in a muffle furnace, and fired at 800° C. for 3 hours to obtain a sintered block.

[0060]c Use dilute sulfuric acid solution with a concentration of 2% (v / v) to leach ...

Embodiment 2

[0062] a Take a waste SCR denitrification catalyst (the main component is V 2 o 5 -WO 3 / TiO 2 , the specific components are shown in Table 1), the deactivated SCR denitrification catalyst is blown with clean and dry compressed air to remove the fly ash deposited on the surface of the catalyst, wherein the working pressure of the compressed air is 0.5MPa, and the gas flow rate is 0.5m 3 / s, the purge time is 10min. Grind the catalyst into powder in a mortar, and then sieve it with a standard sieve of not less than 100 meshes, and then dry the catalyst powder at 105°C for 2 hours.

[0063] B takes by weighing the catalyst powder 5g that dries in step a, after cooling, adds Na to wherein 2 CO 3 solid, Na 2 CO 3 The mass ratio of the mixture to the catalyst is 1.2. After being fully mixed, it is placed in a muffle furnace, and fired at 800° C. for 5 hours to obtain a sintered block.

[0064] c Use a dilute sulfuric acid solution with a concentration of 10% (v / v) to leach ...

Embodiment 3

[0066] a Take a waste SCR denitrification catalyst (the main component is V 2 o 5 -WO 3 / TiO 2 , the specific components are shown in Table 1), the deactivated SCR denitrification catalyst is blown with clean and dry compressed air to remove the fly ash deposited on the surface of the catalyst, wherein the working pressure of the compressed air is 0.5MPa, and the gas flow rate is 0.5m 3 / s, the purge time is 10min. Grind the catalyst into powder in a mortar, and then sieve it with a standard sieve of not less than 100 meshes, and then dry the catalyst powder at 105°C for 2 hours.

[0067] B takes by weighing the catalyst powder 5g that dries in step a, after cooling, adds Na to wherein 2 CO 3 solid, Na 2 CO 3 The mass ratio of the mixture to the catalyst is 1.2, and after being fully mixed, it is placed in a muffle furnace, and fired at 800° C. for 3 hours to obtain a sintered block.

[0068] c Use dilute sulfuric acid solution with a concentration of 2% (v / v) to leach...

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Abstract

The invention discloses a separating and recovering method for W and V in a waste SCR denitration catalyst, and belongs to the technical field of recovery of waste catalysts. The separating and recovering method comprises the specific steps that at first, after being smashed and dried, the SCR catalyst is uniformly mixed with Na2CO3 to obtain a mixture, the mixture is calcined at high temperature to obtain a calcined product, and the calcined product is placed in dilute sulphuric acid to leach W and V; then, W and V in the leachate are extracted with a trioctylamine-isodecanol kerosene solution, and are separated out from an extracted organic phase with NaOH as a back-extractant; next, H2SO4 is added in a back extraction solution to regulate pH, excessive NH4C1 is added to realize vanadium precipitation, and ammonium metavanadate precipitates obtained through filtering are calcined to obtain a V2O5 product; and at last, sulfuric acid is continuously added in a secondary filtrate obtained after vanadium precipitation to regulate pH, excessive CaCl2 is added to realize tungsten precipitation, CaWO4 precipitates obtained through filtering are pickled with hydrochloric acid to obtain a pickled product, and the pickled product is calcined to obtain a WO3 product. The separating and recovering method can realize efficient separation and recovery of W and V in the waste SCR catalyst, the process is simple, the pollution is less, and the separating and recovering method has a relatively high engineering application value.

Description

technical field [0001] The invention belongs to the technical field of waste catalyst recovery, and in particular relates to a method for separating and recovering metal tungsten and vanadium in a waste SCR denitration catalyst. Background technique [0002] NO from coal burning x It is the main cause of acid rain, photochemical smog and ozone layer destruction, and has become the main air pollutant second only to inhalable particulate matter. Coal-fired power plants are NO x Nearly 70% of my country's nitrogen oxide emissions come from coal combustion. At present, Selective Catalytic Reduction (SCR) denitrification technology is widely used in domestic and foreign industries to control it. Under the action of catalyst, the reducing agent NH 3 NO in flue gas x Revert to harmless N 2 and H 2 O, the main reactions involved are as follows: [0003] 4NH 3 +4NO+O 2 →4N 2 +6H 2 o [0004] 2NH 3 +NO+NO 2 →2N 2 +3H 2 o [0005] 8NH 3 +6NO 2 →7N 2 +12H 2 o [000...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B34/36C22B34/22
CPCC22B7/007C22B7/009C22B34/225C22B34/365Y02P10/20
Inventor 贾勇丁万丽陈光吴胜华陈宜华丁希楼戴波李智芳
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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