Method for recovering tungsten trioxide and ammonium metavanadate from selective catalytic reduction (SCR) denitration catalyst

A denitration catalyst and ammonium metavanadate technology, applied in the field of recycling tungsten trioxide and ammonium metavanadate, can solve problems such as environmental pollution, achieve good environmental benefits, good economic benefits, and reduce emissions

Active Publication Date: 2012-07-11
江苏万德环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The SCR denitration catalyst must be replaced after three years of use, and the catalyst contains a certain amount of WO 3 and V 2 o 5 , W is a heavy metal, V 2 o 5 It is an environmental poison, and if it is not handled properly, it will cause very serious pollution to the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0018] Embodiment 2 The method for recovering tungsten trioxide and ammonium metavanadate from the SCR denitration catalyst includes the following steps in sequence: (1) the 3 and V 2 o 5 After crushing and sieving the waste SCR denitrification catalyst, it is made into 150-180 mesh catalyst powder, and the WO in the catalyst powder 3 The weight percentage is 7%, V 2 o 5 The weight percentage is 4%; (2) Add 150-180 mesh sodium carbonate to the above catalyst powder, the weight ratio of sodium carbonate is catalyst powder: sodium carbonate = 100:30, fully stir after mixing to become a catalyst and sodium carbonate mixed powder; (3) Put the above catalyst and sodium carbonate mixed powder into the sintering furnace, and raise the temperature to 800 ° C at a rate of 15 ° C per minute to make it a sintered material, and the WO in the catalyst and sodium carbonate mixed powder 3 , V 2 o 5 and Na 2 CO 3 converted to Na in the sinter 2 WO 4 and NaVO 3 , WO 3 +Na 2 CO 3 ...

Embodiment 3

[0020] Embodiment 3 The method for recovering tungsten trioxide and ammonium metavanadate from the SCR denitration catalyst includes the following steps in turn: (1) will contain WO 3 and V 2 o 5 After crushing and sieving the waste SCR denitrification catalyst, it is made into 150-180 mesh catalyst powder, and the WO in the catalyst powder 3 The weight percentage is 6%, V 2 o 5The weight percentage is 3.5%; (2) Add 150-180 mesh sodium carbonate to the above catalyst powder, the weight ratio of sodium carbonate is catalyst powder: sodium carbonate = 100:25, fully stir after mixing to become a catalyst and sodium carbonate mixed powder; (3) Put the above catalyst and sodium carbonate mixed powder into the sintering furnace, and raise the temperature to 800 ° C at a rate of 12 ° C per minute to make it a sintered material, and the WO in the catalyst and sodium carbonate mixed powder 3 , V 2 o 5 and Na 2 CO 3 converted to Na in the sinter 2 WO 4 and NaVO 3 , WO 3 +Na ...

Embodiment 4

[0022] Embodiment 4 The method for recovering tungsten trioxide and ammonium metavanadate from the SCR denitration catalyst comprises the following steps in sequence: (1) the 3 and V 2 o 5 After crushing and sieving the waste SCR denitrification catalyst, it is made into 150-180 mesh catalyst powder, and the WO in the catalyst powder 3 The weight percentage is 5%, V 2 o 5 The weight percentage is 3%; (2) Add 150-180 mesh sodium carbonate to the above catalyst powder, the weight ratio of sodium carbonate is catalyst powder: sodium carbonate = 100:20, fully stir after mixing to become a catalyst and sodium carbonate mixed powder; (3) Put the above catalyst and sodium carbonate mixed powder into the sintering furnace, and raise the temperature to 800 ° C at a rate of 10 ° C per minute to make it a sintered material, and the WO in the catalyst and sodium carbonate mixed powder 3 , V 2 o 5 and Na 2 CO 3 converted to Na in the sinter 2 WO 4 and NaVO 3 , WO 3 +Na 2 CO 3...

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Abstract

The invention relates to a method for recovering tungsten trioxide and ammonium metavanadate from a selective catalytic reduction (SCR) denitration catalyst. The method comprises the following steps of: crushing the SCR denitration catalyst, sieving to obtain catalyst powder, mixing with sodium carbonate, and stirring fully and uniformly; putting the mixed powder into a sintering furnace, and sintering to obtain a sintered material; keeping temperature for 1 hour, and sieving to obtain sintered material powder; pouring warm water, so that Na2WO4 and NaVO3 in the sintered material powder are dissolved fully, filtering, and removing precipitates to obtain a mixed solution of Na2WO4 and NaVO3; regulating the pH value to be 6.5-7.5, adding an ammonium bicarbonate solution or an ammonium chloride solution, and precipitating ammonium metavanadate precipitate; filtering, washing by using a diluted ammonium bicarbonate solution for 2 to 3 times, washing by using 30 percent ethanol for 1 to 2 times, and drying to obtain an ammonium metavanadate finished product; and converting the Na2WO4 in the residual solution into ammonium paratungstate, evaporating the residual solution to obtain ammonium paratungstate crystals, and calcining to obtain the tungsten trioxide. By the method, the ammonium metavanadate and the tungsten trioxide can be recovered, and the discharge of pollutants is reduced.

Description

technical field [0001] The invention relates to a method for recovering tungsten trioxide and ammonium metavanadate, in particular to a method for recovering tungsten trioxide and ammonium metavanadate from an SCR denitration catalyst. Background technique [0002] At present, the nitrogen oxide pollution of flue gas is becoming more and more serious, and the state has increased the intensity of compulsory denitrification. Flue gas denitrification methods can be divided into dry method and wet method. Among them, dry methods include selective catalytic reduction (SCR, Selective Catalytic Reduction), selective non-catalytic reduction (SNCR), non-selective catalytic reduction (NSCR), electron beam, molecular sieve, activated carbon adsorption method and combined desulfurization and denitrification method, etc. Wait. [0003] In the SCR denitrification process, nitrogen oxides are reduced to harmless nitrogen and water by ammonia under the action of a catalyst: 4NO+4NH 3 +O ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/02C01G31/00B01D53/90B01D53/56
Inventor 李守信索平王亦亲华攀龙于光喜颜少云
Owner 江苏万德环保科技有限公司
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