高比表面积砂状氧化铝制备研究进展

比表面积是砂状Al_2O_3的重要参数,对产品的溶解性能、吸氟能力等特性有显著影响。介绍了影响Al_2O_3比表面积的微观孔结构因素,分析了铝酸钠溶液分解过程和氢氧化铝煅烧过程的调控措施对砂状Al_2O_3产品形貌、粒度、比表面积等参数的影响,概述了外场强化、改变溶液体系等新的制备技术及其产品性能。指出各种强化技术可与现行生产工艺相匹配,为产出冶金级砂状Al_2O_3和化学品活性Al_2O_3等不同种类的高比表面积产品提供了新的途径。认为突破强度随比表面积增大而降低这一瓶颈并开发出高质量的砂状Al_2O_3依然是今后的一个研究热点。

Research Progress in Preparation of Sandy Alumina with High Specific Surface Area

Specific surface area,an important parameter of sand-shape Al2 O3 ,has remarkable effects on the characteristics of the product,such as dissolution performance and fluoride absorption ability.The microcosmic mechanism of pore structure′s effect on specific surface area was introduced,and influences of several controlling measures on properties like morphology,size distribution and especially specific surface area during the seeded precipi-tation process of sodium aluminate solution and the calcination process of aluminium hydroxide were discussed.A quick overview of some recent preparation technologies by enhancement with external field and modification of the so-lution system,and the performance of the product were given as well.It′s proposed that the new methods can match the present technology effectively,which means a feasible process for preparing different kinds of products with high specific surface area from metallurgical-grade sandy Al2 O3 to chemistry active Al2 O3 .The way to break through the bottleneck that the intensity of product will decrease with the increase of specific surface area and to obtain sandy Al2 O3 with high quality are still research focuses in the future.