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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。
The specific surface area is an important parameter of sand-like Al 2 O 3, which has a significant influence on the properties of the product such as solubility and fluorine absorption capacity. The microscopic pore structure factors influencing the specific surface area of Al 2 O 3 were introduced. The effects of the decomposition process of sodium aluminate solution and the calcination process of aluminum hydroxide on the morphology, particle size and specific surface area of the Al 2 O 3 product were analyzed. , Change the solution system and other new preparation technology and product performance. It is pointed out that all kinds of strengthening technology can be matched with the current production technology and provide a new way to produce different kinds of high specific surface area products such as metallurgical grade Al 2 O 3 and chemical active Al 2 O 3. It is still a hot topic in the future that the breakthrough strength decreases with the increase of specific surface area and develops high quality sand-like Al 2 O 3.