用D201树脂从石煤钒矿酸浸液中提钒

Extraction of Vanadium from Acid Leaching Solution of Vanadium Ore with D201 Resin

对离子交换法从石煤钒矿酸浸液中提钒进行了研究。主要考察了原液pH、速比、交换前液钒浓度对钒吸附率的影响。结果表明,在pH=1.85、吸附速度与树脂体积比1.5 h^(-1)、交换前液钒浓度4 g/L条件下,钒的吸附效果较佳。中试试验证明,原液V_(2)O_(5)含量4 g/L左右,采用“三柱串联吸附—优化调节—两柱串联再吸附”流程,当吸附尾液体积是树脂总体积约20倍,尾液钒品位稳定在约0.13 g/L,平均含钒低至约0.11 g/L时,V_(2)O_(5)吸附率为97.17%。以4%NaOH+4%NaCl配比的解吸剂对饱和D201进行动态解吸,解吸液中V_(2)O_(5)含量达到峰值为119.49 g/L,利用4倍树脂体积的解吸剂,最终得到富钒解吸液中V_(2)O_(5)浓度为57.36 g/L。解吸液无需净化处理,即可实现酸性铵盐一步沉钒法制备高纯V_(2)O_(5)产品,最终五氧化二钒品位为98.36%,产品符合YB/T 5304—2017要求,级别为粉钒V_(2)O_(5)98.0-P级。

Extraction of vanadium from acid leaching solution of stone coal vanadium ore by ion exchange method was studied.Effects of pH value,ratio of adsorption rate and resin volume and vanadium concentration in solution before exchange on vanadium adsorption rate were investigated.The results show that adsorption effect of vanadium is better when pH value is 1.85,ratio of adsorption rate and resin volume of 1.5 h^(-1),and concentration of vanadium in solution before exchange is about 4 g/L.The pilot test results show that when V_(2)O_(5)concentration in the original solution is about 4 g/L,and the process of three column series adsorption,optimization adjustment,two column series re-adsorption is adopted,V_(2)O_(5)adsorption rate is 97.17%under the conditions including volume of adsorption tail solution of about 20 times of total volume of resin,vanadium concentration in tail solution of about 0.13 g/L,and average vanadium concentration of as low as about 0.11 g/L.The saturated D201 was dynamically desorpted with 4%NaOH+4%NaCl,V_(2)O_(5)concentration in desorption solution reaches the peak value of 119.49 g/L,and V_(2)O_(5)concentration in vanadium-rich solution is 57.36 g/L by using 4 times the volume of resin.High purity V_(2)O_(5)product can be prepared by one-step precipitation of vanadium with acidic ammonium salt without purification treatment.The final grade of V_(2)O_(5)is 98.36%,which meets the standard of YB/T 5304—2017 and grade of V_(2)O_(5)98.0-P.