Discussion on Routes of Recycling Waste Water Produced from APV Precipitation with Acidic Ammonium Salts

Routes of recycling waster water produced from APV precipitation with acidic ammonium salts are proposed,which is expected to be used for rinsing precipitation equipment,washing tailings and leaching roasted materials and corresponding experiments are carried out.The experimental results show that use of waste water for rinsing precipitation equipment can effectively solve the problem of APV redissolution as vanadium concentration of APV is less than 0.15 g/L in the solution with pH value of 2.5~3.5,thus reducing vanadium loss.Using waste water instead of production water offers a better option to wash tailings when washing is conducted at 90 ℃ above,with liquid/solid ratio more than 2.5,for more than 3 times and at least 45 minutes each time.Using waste water for leaching roasted materials is practicable and the leached solution is more desirable for dephosphorization.