粉体高纯偏磷酸铝的制备及表征

Preparation and Characterization of High-purity Powder Aluminum Metaphosphate

通过对磷酸和氢氧化铝制备的磷酸二氢铝,在不同制备方法下制备偏磷酸铝,使用化学分析和ICP-OES分析手段对其纯度进行了检测,并用XRD、SEM和TEM对其结构进行了表征。结果表明,单一微波制得的产品为无定型结构,易吸潮,含量为93.75%。单一焙烧法制得的偏磷酸铝,易聚合板结,取料耗时费力,一次性收率低。微波法与焙烧法连用制备偏磷酸铝,刚好避免了前两种制备方法的缺点,该法制备的产品不与培烧器皿粘结,易取出、易压碎,球形颗粒,大小均匀,粒径基本在18~35 nm之间。

Aluminum metaphosphate was prepared by different preparation methods from aluminum dihydrogen phosphate that were prepared using phosphoric acid and aluminum hydroxide.Its purity was detected by chemical analysis and ICP-OES analysis,and its structure and morphology was characterized by XRD,SEM and TEM.The results showed that aluminum metaphosphate prepared by single-type microwave heating method was in amorphous structure,containing 93.75%aluminum metaphosphate,it shows high absorbance to moisture.Aluminum metaphosphate prepared by single baking method was easy to polymerize and harden,and the extraction of aluminum metaphosphate was time-consuming and laborious,thus attaining low one-time yield.The microwave method and baking method were combined to prepare aluminum metaphosphate,which avoid the shortcomings of the first two preparation methods.Aluminum metaphosphate prepared by this method did not bond with the baking utensils,hence being easy to take out and crush,showing spherical particle morphology with uniform size in between 18~35 nm.