铁钒共沉淀法对含钒废水的处理

Iron-Vanadium Coprecipitation Method to Remove Vanadium from Vanadium-Containing Wastewater

化学沉淀法对于含钒废水的处理具有操作便捷、成本费用低廉、废渣稳定性好、无二次污染等特点,近年来表现出良好的应用前景.将三价铁离子对含钒废水的处理表现出一定优势,在应用不同碱液对共沉淀反应体系pH的调节过程中,铁钒共沉淀逐渐形成.随着pH的逐渐升高,无定型态氢氧化铁也会产生,该物质可作为吸附剂同样将钒离子固定达到更好的除钒效果.实验结果表明:在钒溶液初始质量浓度200 mg/L,铁钒摩尔比为2,使用CaO乳浊液中和溶液,控制反应体系pH为4的最佳共沉淀除钒条件下,反应100 h左右时钒去除率可达99%以上,且稳定不变.动力学实验结果表明:将反应延续到378 h,钒去除率仍没有改变,铁钒共沉淀体系稳定.这一实验对含钒废水的大规模去除具有良好的指导作用.

The co-precipitation method has the advantages of convenient operation,low cost,good stability of waste residue and no secondary pollution for the treatment of boiling water containing vanadium,thus it has a good development and application prospect.In this paper,ferric ions were mixed into vanadium-containing wastewater,and the vanadium ions were deposited in the coprecipitation system under the condition of dropping alkaline solution to adjust the pH value of reaction system.Through this way,we immobilized the vanadium ions in the coprecipitation system and achieved the purpose of removing vanadium from the solution.The experimental results showed that the initial concentration of vanadium solution was set as200mg/L,the initial n(Fe)/n(V)was set as2,CaO emulsions was used to neutralize reaction system pH value of4,then more than99%of vanadium was removed,and the vanadium removal rate was achieved stability at about100h.The results of kinetic experiments showed that the removal rate of vanadium remains unchanged after378h,so that,the vanadium coprecipitation system was stable.