Abstract: The effects of nonionic and anionic surfactants [polyethylene glycol (PEG), polyoxyethylene lauryl ether and sodium dodecylbenzene sulfonate] on boehmite seeded precipitation from sodium aluminate solution were investigated. The results showed that precipitation and agglomeration of crystals were inhibited by sodium dodecylbenzene sulfonate, resulting in refinement of product, the precipitation was intensified and agglomeration of particles was promoted by polyethylene glycol. The largest precipitation rate (32.39%) was obtained with PEG1000 addition of 1 g/L, increased by 8.37%. The best agglomeration efficiency was gained with PEG1000 addition of 5 g/L, and median particle size (D50) of product was 23.86 mm, improved by 4.5%. The analytical results by XRD and TG showed that the crystalline structure of products did not change owing to additive charge, and all products were Al(OH)3 and AlOOH.

Key words: sodium aluminate solutions, surfactant, boehmite, precipitation, agglomeration

摘要： 研究了非离子及阴离子型表面活性剂(聚乙二醇、聚氧乙烯月桂醚和十二烷基苯磺酸钠)对铝酸钠溶液晶种分解制备一水软铝石的影响. 结果表明，十二烷基苯磺酸钠抑制溶液分解及晶体附聚，导致产物粒度细化；聚乙二醇可强化溶液分解，并促进晶体附聚；PEG1000添加量为1 g/L时获得最高分解率(32.39%)，较空白提高8.37%；PEG1000添加量为5 g/L时附聚效果最好，产物的中位粒径为23.86 mm，较空白提高4.5%. XRD和热重分析结果表明，添加剂未改变产物晶型，产物均为一水软铝石和三水铝石.

关键词: 铝酸钠溶液, 表面活性剂, 一水软铝石, 分解, 附聚