煤矸石制备PFASS及其在废水处理中应用

针对煤矸石制备无机混凝剂的问题,采用正交实验法得出了在煤矸石制备聚合硅酸硫酸铁铝(PFASS)过程中用酸浸取铝和用碱提取硅的最佳反应条件,即最佳酸浸条件为:酸浸时间(A)为1．5h,NaCl助溶剂与煤矸石的质量比(B)为0．05:1,固液比(C)为1:10;最佳碱浸条件为:碱浸时间为2 h,碱液浓度为5mol／L,固液比为1:10。并采用单因素实验法分别讨论了混凝剂的碱化度、废水pH值、混凝时间、混凝剂投加量等参数对废水处理效果的影响,实验证明:采用本工艺生产的PFASS,水处理效果好,COD的平均去除率为45％左右,脱色率也在85％以上。

Study on production of PFASS by gangue and its application in waste water teatment

For solving the question about PFASS production using gangue, the best conditions for withdrawing the alkali and the silicon from the gangue during producing PFASS were obtained by using orthogonal experimental method. That is, the best acid soak conditions are: acid soak time(A) 1.5h, ratio of NaCl flux to gangue quality (B) 0.05:1, solid to liquid ratio(C) 1:10; the best alkaline leaching conditions are: alkaline leaching time 2h, concentration of the lye 5mol/L, solid to liquid ratio(C) is 1:10. The influence of the degree of alkalization of the coagulant, pH value of waste water, the coagulation time and the quantity of coagulant put in on the effect of waste water treatment was discussed by using single factor act-to-try method. The experiment proves that the waste water processing effect is good by using PFASS produced by this craft, with about 45% COD removal and above 85% discoloration.