磷矿酸解渣与聚丙烯酰胺絮凝动力学

通过激光粒度仪在线监测搅拌槽内聚丙烯酰胺与磷矿酸解料浆的絮凝过程 ,研究了絮凝剂加入量、絮凝温度、搅拌速度和酸解渣原始平均粒径对絮凝动力学的影响 .用电泳试验测定酸解渣的表面电性 ,合成不同荷电类型的絮凝剂及通过絮凝剂加入量对絮凝过程的影响实验可以判定磷矿酸解渣与聚丙烯酰胺的絮凝过程符合架桥机理

FLOCCULATION KINETICS ON FINE PHOSPHATE ORE RESIDUE IN PRESENCE OF POLYACRYLAMIDE

A laser particle size analyzer was used to study kinetics of the flocculation of fine phosphate ore residues in the presence of polyacrylamide(PAM) in a stirred tank. The investigation included the adding method of polyacrylamide and the relationship between flocs particle size distributions and time. A rapid initial flocculation was found. The initial flocculation rate was enhanced by increasing temperature, agitation speed and PAM dosage separately, but decreased with increasing viscosity of fluid and average primary residue sizes. There was an optimal PAM dosage associating with solids concentration. The kind of electricity on residue surface was detected by electrophoresis. From flocculation of residues with different types and different amounts of flocculent, it is shown that the flocculation of residues with cationic APAM in a neutral aqueous solution is carried out mainly by charge neutralization,and the flocculation follows the bridging mechanism in the leaching solution of phosphoric acid.