摘要
由于粉煤灰具有良好的吸附性能且富含硅、铝和铁等元素,将其作为助凝剂,用盐酸对粉煤灰改性后与聚合硫酸铁PFS联合使用处理低温低浊水。在用盐酸对粉煤灰进行改性时,研究了振荡时间、振荡速度、盐酸浓度等试验因素对改性粉煤灰吸附助凝效果的影响,得出盐酸改性粉煤灰的最佳试验条件为:振荡器振荡速度80r/min,100 mL 3.6 mol/L盐酸与5g预处理粉煤灰混合振荡3h,试验温度25℃。改性后粉煤灰的比表面积明显增加,并且粉煤灰中部分硅、铝和铁等元素溶出,转变成具有很好絮凝作用的Al3+、Fe3+和H2SiO3,粘附于粉煤灰表面,在处理低温低浊水的过程中能较好地发挥吸附助凝效果。
Becaouse of the excellent adsorption performance and high containing of silicon, aluminum and iron and other elements, fly ash by hydrochloric acid modified was used as a coagulant to purify low temperature and low turbidity water with reagent PFS. When the fly ash were modified by hydrochloric acid, the experimental factors just as duration of oscillation, speed of oscillation and hydrochloric acid concentration were researched. The best experimental conditions of hydrochloric acid modification were follows： the speed of oscillation 80 r/min, 100 mL 3.6 mol/L of hydrochloric acid and 5 g the coal fly ash mixed in the oscillator for about 3 h, the experiment temperature 25 ℃. The specific surface of modified fly ash increased significantly, the elements such as silicon, aluminum and iron dissolved from fly ash and they turned into A13＋, Fe3＋ and H2SiO3 （adhesion on the surface of fly ash） whose flocculation were strong. In the process of purifying low temperature and low turbidity water by hydrochloric acid modified fly ash, the adsorptive property can be exerted effectively.
出处
《非金属矿》
CAS
CSCD
北大核心
2012年第6期64-67,共4页
Non-Metallic Mines
基金
国家自然科学基金项目(51174267)
辽宁省教育厅科学技术研究项目(L2012111)
关键词
低温低浊水
改性粉煤灰助凝剂
吸附性能
low temperature and low turbidity water modified fly ash coagulant aid adsorptive property
