稀土镧改性聚合硫酸铁机理分析及其应用
Mechanism analysis and application of PFS modified by lanthanum
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摘要: 为进一步提高无机高分子絮凝剂的处理效果并降低处理成本，研究"一步法"絮凝剂制备工艺，同时引入稀土镧对絮凝剂进行改性处理，制备固体稀土镧聚合硫酸铁絮凝剂（La-PFS）.实验通过响应面优化絮凝性能，研究结果表明.聚合温度为123 ℃、镧铁摩尔比为1∶105.56、OH-/Fe摩尔比为0.19时，制备产品对高浊度废水除浊效率效果达到99.41%.引入稀土镧在一定程度上增长絮凝剂链状结构，增强吸附能力.在对造纸废水处理中，稀土镧聚合硫酸铁对造纸废水处理效果明显优于传统市售絮凝剂，絮凝沉淀速度有较大提升，浊度去除率达到68%，CODCr去除率达到35%.Abstract: To further improve the processing effect of inorganic polymer flocculants and to reduce the processing cost, we studied "one-step process" for the preparation technique of flocculants and introduced rare earth element lanthanum to modify the nature of flocculants, prepared solidly rare earth lanthanum polymerized ferric sulfate (La-PFS). Flocculating performance was optimized by response surface in this experiment. The results showed that when the temperature of polymerization was 123 ℃, the molar ratio of lanthanum to iron was 1∶105.56 and OH-/Fe molar ratio was 0.19, the de-turbidity efficiency of the preparation product on high turbidity wastewater was 99.41%. The introduction of rare earth lanthanum increased the chain structure of flocculants to a certain extent and enhanced the capacity of adsorption. In the treatment of paper-making wastewater, the effect of rare earth lanthanum polymerized ferric sulfate on paper-making wastewater treatment was significantly better than that of traditionally commercially available flocculants. The precipitation rate of flocculation was greatly improved, the removal rate of turbidity reached 68%, and the removal rate of CODCr reached 35%.
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Key words:
- one-step process /
- La-PFS /
- material preparation /
- mechanism analysis /
- paper-making wastewater
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