A method and device for recovering W and V from waste flue gas denitrification catalyst

Abstract

The invention discloses a method and device for recycling W and V from a waste flue gas denitration catalyst. The method includes the steps that 1, the catalyst is crushed, concentrated sulfuric acid is added for acidolysis, water is added after acidolysis, and an oxygen titanium sulfate solution is obtained; 2, the oxygen titanium sulfate solution is filtered, filter residues are collected for standby application, the filter liquor is heated, concentrated and hydrolyzed, and a hydrolysis product is obtained; 3, the hydrolysis product is filtered, and settlement treatment is conducted on the filter liquor; 4, filtering is conducted after settlement treatment, supernatant liquid is taken, an excessive amount of NH<4>Cl is added to the clear liquid for a reaction, then filtering is conducted, and ammonium metavanadate sediment is obtained; the ammonium metavanadate sediment is calcined, and V<2>O<5> is obtained; 5, an excessive amount of ammonium hydroxide with the concentration being 10%-28% is added to the filter residues in step 2 for a reaction, and then filtering is conducted; the filter liquid is heated to be 80 DEG C-100 DEG C, and an ammonium paratungstate crystal is obtained; the ammonium paratungstate crystal is dried and calcined, and the WO<3> is obtained. By means of the method and device, the V<2>O<3> and the WO<3> which are both high in purity and recovery rate can be extracted from the waste flue gas denitration catalyst.

Description

technical field

[0001] The invention relates to a recovery technology of a waste flue gas denitration catalyst, in particular to a method and a device for recovering W and V from a waste flue gas denitration catalyst. Background technique

[0002] SCR denitrification technology is a necessary means for power plants to achieve ultra-clean emissions. As the core part of SCR denitrification technology, the catalyst will lose its activity due to wear or blockage during operation. Partially regenerable catalysts can continue to be used after regeneration, while non-regenerable catalysts face the situation of rational utilization and disposal (even if regenerable catalysts are regenerated 2 to 3 times, they cannot be regenerated and need to be rationally utilized and disposed of). At present, landfill is the way to dispose of waste denitration catalysts in foreign countries, but there are many thermal power plants in my country, and the amount of waste denitration catalysts produc...

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