论文部分内容阅读
为了解碱度对絮体的形成、破碎及再生过程的影响,采用PDA2000型透光脉动检测仪测定不同碱度下投加硫酸铝时高岭土悬浮液的絮凝指数(FI指数),并以强度因子和再生因子评价絮体的强度和再生能力。结果表明,碱度的高低在很大程度上会影响絮体的形成、破碎及再生过程,所形成絮体的颗粒随碱度的增加而减小。混凝剂投量和碱度高低共同决定了絮体的抗破碎强度,碱度越高,混凝剂投量越大,絮体的强度越高。在电中和作用下形成的絮体在低碱度下经一次破碎后恢复程度接近100%,在网捕卷扫作用下形成的絮体,无论碱度高低,从第2次破碎起,FI指数均以大于10%的幅度逐次下降,絮体不可恢复程度显著增大。
In order to understand the effect of alkalinity on floc formation, crushing and regeneration, the flocculation index (FI index) of kaolin suspensions with different concentrations of Alkalinity were measured by PDA2000 translucent pulsation detector. And regeneration factor evaluation floc strength and regeneration capacity. The results show that the basicity of high and low will largely affect the floc formation, crushing and regeneration process, the formation of floc particles with increasing alkalinity decreased. Coagulant dosage and alkalinity level together determine the floc resistance to crushing strength, the higher alkalinity, coagulant dosage, the higher the floc strength. Under the action of neutralization, the floc formed under a low alkalinity is nearly 100% recovered after one crushing. The floc formed under the action of net sweeping, regardless of the alkalinity level, starts from the second crushing. FI Index were more than 10% of the successive decline in the extent of flocs significantly increased the degree of non-recoverable.