多孔悬浮陶粒制备及荷正电改性的研究

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。

Preparation of porous ceramic suspension and modification of positively charged

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/cm3)and good wear resistance.In addition,heterogeneous condensation,repeatedly suspended ceramic coating method modified positively charged surface,and adsorption properties of modified ceramic,iron load,bulk density,apparent porosity,compressive strength,modification of surface morphology,surface electrical and phase composition of coatings were characterized by analysis.The best modification conditions were determined by methylene blue adsorption experiments as follows: 1mol/L of ferric chloride,calcination temperature 650 ℃,roasting time 3 h.Prepared under this condition,the modified ceramic removal rate of 86.3% 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.