不同絮凝剂在亚熔盐体系中的沉降性能研究

以亚熔盐法处理拜耳赤泥所得料浆为研究对象,以沉降速度、澄清度、分层效果为评价指标,采用量筒试验法考察了Nalco-9779、BASF-HP20、Lcb8、L1bb和90HS等有机高分子絮凝剂的絮凝性能,最终筛选出最佳絮凝剂为Nalco-9779。重点考察了时间、温度、添加量和碱浓度等因素对Nalco-9779絮凝性能的影响,结果表明,Nalco-9779絮凝沉降的最佳工艺条件为:沉降时间10min、温度100℃、Na2O浓度小于540g/L、添加量每吨赤泥160g。

Study on Sedimentation Performance of Different Flocculants in Sub-molten Salt System

Sedimentation performance of the slurry obtained from the treatment of Bayer red mud through sub-molten salt process was studied by means of cylinder measuring.Sedimentation velocity of slurry,clarity of solution and boundary surface were selected as parameters to evaluate the sedimentation performance with adding of a series of organic polymer flocculants including Nalco-9779,BASF-HP20,Lcb8,L1bb and 90HS,etc.The results show that Nalco-9779 is the optimum one.In addition,the effects of sedimentation time,temperature,dosage of flocculants and concentration of alkaline medium on the sedimentation performance of Nalco-9779 were investigated in detail.The optimum process conditions for slurry treatment mentioned above with use of the flocculants of Nalco-9779 including time of 10 min,temperature of 100 ℃,Na2O concentration of less than 540g/L() and flocculants dosage of 160 g per ton red mud.