以工业废渣粉煤灰为主要原料,制备密度与水接近（0.80～1.10g/cm3）且耐磨性好的高活性多孔悬浮陶粒。通过非均相凝聚、涂层法对悬浮陶粒表面进行荷正电改性,并对改性陶粒的吸附性能、铁负载量、体积密度、显气孔率、抗压强度、表面形貌、表面电性及改性涂层的物相组成进行了表征。优化的改性条件为：氯化铁浓度为1mol/L,焙烧温度为650℃,焙烧时间为3h。此条件下的改性陶粒对亚甲基蓝的去除率达到86.3%,是未改性陶粒的3～4倍。检测结果表明改性陶粒表面附着一层厚度不均的铁氧层,其主晶相为α-Fe2O3,呈多孔结构。
Industrial waste fly ash was used as the main raw material to prepare a suspended ceramic granule which has a specific density close to water （0.80-1.10g/cm^3）and good wear resistance. In addition, heterogene- ous condensation, repeatedly suspended ceramic coating method modified positively charged surface, and ad- sorption properties of modified ceramic, iron load, bulk density, apparent porosity, compressive strength, mod- ification of surface morphology, surface electrical and phase composition of coatings were characterized by anal ysis. The best modification conditions were determined by methylene blue adsorption experiments as follows： lmol/L of ferric chloride, calcination temperature 650 ℃, roasting time 3 h. Prepared under this condition, the modified ceramic removal rate of 86. 30% methylene blue, is 3-4 times that of unmodified ceramic. The test showed that the modified ceramic granule was covered with a layer of iron oxide with uneven thickness. The main phase of iron oxide layer was α-Fe2O3 which exhibited porous structures.
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