在拜耳法中,添加大量氢氧化铝晶种进行铝酸钠溶液分解是该方法的一个很大的特点。但迄今对于种子表面和铝酸钠溶液间传质过程或者分解反应机理仍不清楚。多数研究资料表明,氢氧化铝晶体长大,次生晶核形成,微晶颗粒附聚等现象的机理,都与种子的“表面成核”有关。所以可以认为种子的作用应作为“晶核形成体”,有催化剂的性质。本文简单讨论有催化作用的种子活性的概 In the Bayer process, adding a large amount of aluminum hydroxide seed solution for sodium aluminate solution is a great feature of this method. However, the mechanism of mass transfer or decomposition reaction between seed surface and sodium aluminate solution has not been clarified so far. Most research data show that the mechanism of the growth of aluminum hydroxide crystals, the formation of secondary nuclei and the agglomeration of crystallite particles are all related to the “surface nucleation” of the seeds. Therefore, it can be considered that the role of seeds should be “nucleated bodies” and have the property of catalysts. This article briefly discusses the catalytic activity of seeds