Vanadium, symbol V, a silvery white metal, has a very high melting point, which makes it a refractory metal together with niobium, tantalum, tungsten, molybdenum. As an active component, vanadium pentoxide is used in tungsten trioxide SCR denitration catalyst, and tungsten trioxide is exhibiting the role of anti-sulfide, anti-toxic. The toxicity of metal vanadium is very low, but its compounds (vanadium salts) are toxic to humans and animals, especially vanadium pentoxide has a very high toxic and can cause respiratory and nervous system, gastrointestinal, skin changed. So, in order to prevent environmental pollution, human poisoned, and also resource get recycled, the recovery of vanadium from waste SCR denitration catalyst is extremely necessary.

 

Studies have demonstrated a new method for recycling vanadium from tungsten trioxide SCR denitration catalyst, follow these steps:

1. Crushed the waste W-Ti-V based to 200-300 mesh;

2. Take electrolytic cell, and added an amount of anti-reducing strong electrolyte solution; then put the crushed catalyst into the cell, carry out constant current density electrolysis by controlling the current density, or constant pressure electrolysis by controlling the voltage;

3. Carrying out filtration to separate the solid and liquid, to obtain a mixed solution containing with vanadium;

4. Take out a new cell and take out the secondary electrolysis at the same condition;

5.Add alkaline solution into the mixture in the cathode, then add ammonium salt solution and stay overnight for precipitating vanadium, calcining the white solid obtained by filtration to get the yellow solid containing vanadium, thus to achieve the purpose of recycling vanadium.

 

This process of vanadium recovery can be operated at room temperature with a mild reaction condition, the electrolysis reaction has good chemical reaction selectivity, and vanadium can be almost completely recovered.