【摘要】 为了回收大洋粘土制备白炭黑后残液中的Al3+,并获得氧化铝超细粉体,实验选用NH3.H2O为沉淀剂,在常温下采用沉淀法使残液中Al3+以氢氧化铝形式沉淀并去除其它杂质离子,然后将得到的沉淀在1200℃灼烧,保温1h。利用IR和XRD测试了产物的物相组成和结构,证实实验可以获得纯度较高的α-Al2O3;而SEM和粒度分析结果显示产物粒度细小,部分颗粒可以达到纳米级;BET结果显示Al2O3的比表面积可达32m2/g。根据氧化铝结构和性能等优选的实验条件为大洋粘土的进一步开发利用提供了参考依据。更多还原

【Abstract】 In order to recover Al（3+）in the filtrate which was gained from preparing amorphous silica by sea clay and obtain alumina fine powders,in the experiment we chose NH₃·H₂O as precipitator.In room temperature,we used the method of precipitation to make Al（3+）in the filtrate deposit as Al（OH）₃ and eliminate other impure ions.Then the gained depositions were calcined at 1 200℃ and retained 1 h.We used the methods of IR and XRD to test theirs phase composition and structures,the results verified the experiment can obtain higher-pure α-Al₂O₃.However the results of SEM and analysis showed that the productions’ granularities were very small,some grains could reach nanometer level.The result of BET showed that the ratio surface area of Al₂O₃ could reach 32 m（2）/g.The optimal experimental conditions based on the structure and capability of alumina offered reference basis for more exploit of the sea clay.更多还原