粉煤灰基混凝剂的制备及应用研究

Studies on the Preparation and Application of a Fly Ash-based Coagulant

在粉煤灰中加入少量黄铁矿烧渣和适量固体ＮａＣｌ，在９０℃温度下用稀Ｈ２ＳＯ４搅拌浸提３ｈ，即制得集物理吸附和化学混凝为一体的粉煤灰基混凝剂。这种混凝剂用于不同工业废水处理，ＣＯＤ去除率在５０％—８３％之间，色度去除率在８９％—９８％之间，混凝沉淀速度快，污泥体积小，处理废水费用低．

A fly ash-based coagulant combining the capabilities of both physical adsorption and chemicalcoagulation has been prepared by adding a smallamount of pyrite slag and an appropriate amountof NaCl to fly ash, and then the resulting mixturebeing stirred and extracted with a dilute H2SO4for 3 hours at a temperature of 90℃.The coagulant thus prepared was used to treat various kindsof industrial wastewaters,giving a COD removalof 53% - 83 %, a colourness removal of 89% 98%, a higher rate of settlement, a smaller volume of sludge, and a lower cost of treatment.