钛白表面不同铝膜制备及其性能研究  

Preparation and performance of different aluminum filmson titanium dioxide surface

作　　者：吴健春[1] 路瑞芳[1] 刘婵 程晓哲[1] Wu Jianchun;Lu Ruifang;Liu Chan;Chen Xiaozhe(Pangang Group Research Institute Co.,Ltd.,State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Panzhihua 617000,Sichuan,China)

机构地区：[1]攀钢集团研究院有限公司,钒钛资源综合利用国家重点实验室,四川攀枝花617000

出　　处：《钢铁钒钛》2021年第2期66-72,共7页Iron Steel Vanadium Titanium

摘　　要：以偏铝酸钠、硫酸铝、磷酸为原料在不同pH条件下制备不同铝膜钛白,采用XRD、红外光谱、热重分析、SEM、BET、ZETA电位等分析了不同铝膜的晶体结构、热稳定性、微观形貌和物理性能。结果表明:不同pH获得的水合氧化铝ZETA电位均为正值,亲水性能不佳,而磷酸铝ZETA电位为负值,具有很好的亲水性能。pH=4~5时获得的水合氧化铝为近球形的无定型结构,在200℃和930℃时失去其结合水;pH=8~9时得到的絮状勃姆石结构AlO(OH),拥有极大的比表面积,在402℃失去结合水;pH=10~10.5时得到界面清晰、大小不均匀的颗粒状三羟铝石块,分别在297.5℃和513℃失去结合水。在偏铝酸钠中加入磷酸制备得到的是无定型的磷酸铝,其形貌为球形小颗粒团聚成的聚集体。所制备的铝膜在紫外区吸光度由强到弱的顺序是无定型水合氧化铝>磷酸铝>三水铝石>勃姆石型水合氧化铝。几种铝化合物包覆在二氧化钛表面均能提高其颜料性能,但水合氧化铝会降低二氧化钛的水分散性。Using sodium metaaluminate,aluminum sulfate and phosphoric acid as raw materials,different aluminum films were prepared at various pH values.Crystal structure,thermal stability,microstructure and physical properties of the films were analyzed by XRD,infrared spectroscopy,thermogravimetry,SEM,BET,ZETA potential.The results show that the ZETA potentials of the hydrated alumina obtained at different pH are all positive with poor hydrophilic properties,while the ZETA potential of aluminum phosphate is negative with good hydrophilic properties.The hydrated alumina obtained at pH=4~5 has a nearly spherical amorphous structure,and it loses the bound water at 200℃and 930℃.AlO(OH)obtained at pH=8~9 has a flocculent boehmite structure with a large specific surface area and it loses the bound water at 402℃.The granular bayerite block with clear interface and uneven size distribution can be obtained at pH=10~10.5,which loses the bound water at 297.5℃and 513℃,respectively.Amorphous aluminum phosphate is prepared by adding phosphoric acid into sodium metaaluminate,whose morphology is an aggregate of spherical small particles.The order of absorption in the ultraviolet region from strong to weak is amorphous hydrated alumina>aluminum phosphate>gibbsite>boehmite hydrated alumina.The pigment performance of titanium dioxide can be improved by coating of these aluminum compounds on the surface of titanium dioxide,but hydrated alumina will reduce the water dispersibility of titanium dioxide.

关 键 词：钛白 水合氧化铝 磷酸铝 热稳定性 水分散性 

分 类 号：TF823[冶金工程—有色金属冶金] TQ621[化学工程—精细化工]