Recovery of V2O5 from Bayer liquor by ion exchange
来源期刊：Rare Metals2010年第2期
论文作者：ZHAO Zhuoa, b, LI Xiaobina, and ZHAO Qingjieb a School of Metallurgical Science and Engineering, Central South University, Changsha , China b Zhengzhou Research Institute of Chalco Ltd., Zhengzhou , China
文章页码：115 - 120
摘 要：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.
ZHAO Zhuoa, b, LI Xiaobina, and ZHAO Qingjieb a School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China b Zhengzhou Research Institute of Chalco Ltd., Zhengzhou 450041, China
摘 要：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.
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