铁氧化物生物多孔陶粒的制备工艺及性能

Preparation and characterization of iron oxide-based porous ceramsite

以针铁矿（Goethite,GT）、锯末（成孔剂）和凹凸棒石黏土（粘结剂）为原料,在空气气氛下煅烧,制备出符合国家水处理标准的铁氧化物生物多孔陶粒（Iron Oxide-based Porous Ceramsite,IPC）。利用所制备IPC的抗压强度作为评价IPC质量的指标,通过单因素实验、正交实验来优化IPC的物料配比和煅烧工艺,并通过XRD、SEM,偏光显微镜（Polarizing Microscope-PM）,比表面积（BET-SSA）等技术来表征IPC孔结构特征及其特性。结果表明：IPC材料的孔连通性好,大孔孔径为10～20μm,抗压强度达到51～78N,比表面积为79m2/g,是一种以开放孔隙为主的多孔生物陶粒。在一定培养条件下进行陶粒的挂膜实验,结果表明,微生物可以通过IPC开放性孔隙深入IPC内部附着生长,该多孔陶粒生物负载量高于市售陶粒和颗粒沸石,可望为曝气生物滤池提供新的功能性载体材料。

A type of novel iron oxide-based porous ceramsite（IPC）was prepared using goethite,sawdust and palygorskite as raw material.As-prepared IPC was proved to meet the national standard of water treatment.In various propriety tests for the ceramsite,the compressive strength was the principal factor to determine the most suitable product.An orthogonal experiment design in the optimization of mass ratio of raw materials and processing technology for IPC was introduced.XRD,SEM,polarizing microscope（PM）and specific surface area（BET-SSA）were used to characterize IPC.The results indicate that IPC has a porosity between 10-20μm as well as 51-78Nof the compressive strength respectively.IPC owns large specific surface area（79m2/g）and interconnects pores.The micro-organisms growth experimental results also show that in the same submerged culture conditions,the biological load in IPC is significantly higher than the commercially available ceramic and particle zeolite.The ceramisite is suitable to serve as the novel functional filler in biological aerated filter.