| Abstract:The preparation technique of non-sintered ceramsite from fly ash was introduced. The effect of the amounts of cement, activator, light weight material and organic polymer as well as technological conditions on the specific surface area of self-made ceramsite were studied by using orthogonal experiment method. The optimum ratio of raw materials was found: fly ash 71%, cement 10%, activator 10%, lightweight material 7%, organic polymer porous agent 2%. The properties of self-made fly ash ceramsite were as follows: specific surface area 12.94 m2/g, bulk density 0.71 g/cm3, water absorption 19.5%, compressive strength 4.01 MPa. In this experiment, the optimum time for preparating non-sintered fly ash ceramsite was determined to be 8 h. Through the comparison test of self-made ceramsite and activated carbon particles in an aerated biological filter, the biological performance of self-made ceramsite was similar to that of activated carbon particles, but the cost of the ceramsite was only 1/7 of that of activated carbon particles. Its application in waste water treatment in Shandong Huatai Paper Industry Co., Ltd. annual cost could save of 1.5 million yuan ,with obvious benefit. |
