摘要
将铝土矿选矿尾矿与磷酸以P与Al摩尔比等于3的比例混合,制备了三聚磷酸铝,并用氧化锌对所制备的三聚磷酸铝进行改性处理,得到三聚磷酸铝防腐颜料。改性的三聚磷酸铝的酸度、白度及粒度均得到了改善。运用电化学阻抗方法测试了所制备的三聚磷酸铝防腐颜料的防腐性能。结果表明:含有改性三聚磷酸铝防腐颜料的涂层在电解质中浸泡40d后的阻抗为7×107Ω,含商品三聚磷酸铝防腐颜料APW?2的涂层浸泡40d后的阻抗为5.7×107Ω,这表明所制备的三聚磷酸铝防腐颜料具有优于或相当于商品防腐颜料的防腐性能。
Aluminum tri-polyphosphate was synthesized from bauxite tailings and phosphoric acid with a P/A1 molar ratio of 3. This is highly advantageous from a waste recycling perspective as bauxite railings are generally regarded as unusable waste. The acidity, whiteness and mean particle size of prepared aluminum tri-polyphosphate are all improved after modification. The possibility of using modified aluminum tri-polyphosphate as an anticorrosive pigment was also investigated by electrochemical impedance spectroscopy. The resistance of the coatings with modified aluminum tri-polyphosphate is 7×10^7Ω for 40 d of immersion, which is superior or at least comparable to that of coatings containing APW-2, which exhibits a resistance of 5.7×10^7Ω.
基金
Project (2005CB623701) supported by the National Basic Research Program of China
关键词
三聚磷酸铝
废物处理
电化学阻抗谱
aluminum tri-polyphosphate
waste processing
electrochemical impedance spectroscopy
