制备条件对拟薄水铝石胶溶性的影响

Influence of Preparation Conditions on the Dispersion of Pseudo Boehmite

采用铝酸钠-硝酸铝法制备拟薄水铝石。研究了制备过程中影响拟薄水铝石胶溶指数的工艺条件如中和温度、中和pH值以及老化时间等，结果表明，当中和温度为50～60℃、 pH值在6.0～7.5以及老化时间控制在0.5～1 h之内可以得到胶溶指数高于85％的拟薄水铝石。通过用不同胶溶指数的拟薄水铝石制成氧化铝载体表明，随着拟薄水铝石胶溶指数的变大，载体的强度增加。

Using the method of sodium aluminate -aluminum nitrate to prepare pseudo -boehmite , the factors which impacted dispersion index of pseudo -boehmite , such as the reaction temperature , precipitation pH value and aging time were analyzed.The results showed that as the reaction temperature at 50~60 ℃, precipitation pH value of about 6.0~7.5 and aging time of 0.5~1 h, pseudo-boehmite of dispersion index larger than 85%can be prepared.Using pseudo-boehmite of different dispersion index to make the alumina carrier , it was found that as the dispersion index of pseudo -boehmite bigger , the crush strength of alumina made by it was harder.