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A new technology was developed to recover V2O5 from Bayer spent liquor by ion exchange.The experimental results show that in the conditions of 105°C and 0.20-0.25 mass ratios between CaO in lime and Al2O3 in spent liquor, the precipitation rate of vanadium in Bayer liquor is more than 85%.The vanadium-bearing precipitation is leached by NaHCO3 solution.The leaching rate of vanadium can reach 85% in the conditions of 95°C, 40 g·L-1 of NaHCO3 concentration, and ventilating of CO2.The 201 × 7 type of resin has good adsorption effect on vanadium in the leaching solution.The adsorption rate is more than 94% with the flow rate of 0.09 mL·min-1·g-1 of leaching solution and the temperature of 40-50°C.By using 3 mol·L-1 of NaOH to desorb the saturated resin after adsorption at 40-50°C, a solution with more than 5 g·L-1 of V2O5 can be obtained.After roasting ammonium metavanadate that precipitates from the desorption solution when NH4Cl is added at the temperature of 500-550°C for 2 h, V2O5 with more than 99% of purity is obtained.
A new technology was developed to recover V2O5 from Bayer spent liquor by ion exchange. The experimental results show that in the conditions of 105 ° C and 0.20-0.25 mass ratios between CaO in lime and Al2O3 in spent liquor, the precipitation rate of vanadium in Bayer liquor is more than 85%. The vanadium-bearing precipitation is leached by NaHCO3 solution. The leaching rate of vanadium can reach 85% in the conditions of 95 ° C, 40 g · L-1 of NaHCO3 concentration, and ventilating of CO2 The 201 × 7 type of resin has good adsorption effect on vanadium in the leaching solution. The adsorption rate is more than 94% with the flow rate of 0.09 mL · min -1 · g -1 leaching solution and the temperature of 40 -50 ° C.By using 3 mol·L-1 of NaOH to desorb the saturated resin after adsorption at 40-50 ° C, a solution with more than 5 g · L-1 of V2O5 can be obtained. After roasting ammonium metavanadate that precipitates from the desorption solution when NH4Cl is added at the temperature of 500-550 ° C for 2 h , V2O5 with more than 99% of purity is obtained.