非离子型表面活性剂对铝酸钠溶液晶种分解的影响-中国有色金属学报.PDF

第 18 卷第 10 期 中国有色金属学报 2008 年 10 月 Vol.18 No.10 The Chinese Journal of Nonferrous Metals Oct. 2008 文章编号：1004-0609(2008)10-1909-05 非离子型表面活性剂对铝酸钠溶液晶种分解的影响 彭志宏，刘燕庭，周秋生，刘桂华，李小斌 ( 中南大学 冶金科学与工程学院，长沙 410083) 摘 要：采用对比实验法研究非离子型表面活性剂对铝酸钠溶液晶种分解率及其产品粒度和形貌的影响。结果表 明：添加某非离子型表面活性剂，用量在 100~150 mg/L范围内，可提高分解率 6%左右；粒度分析及电子显微镜 形貌观察表明非离子型表面活性剂可促进Al(OH)3 晶体的附聚和抑制二次成核，产品平均粒径可提高 16 µm。对表 面活性剂强化铝酸钠溶液晶种分解的机理研究表明，表面活性剂改变Al(OH)3颗粒的表面Zeta 电位，同时使铝酸钠 溶液的表面张力降低了 20~30 mN/m，从而可大幅度降低铝酸钠溶液的稳定性，加快晶体生长速度。非离子型表 面活性剂能有效强化铝酸钠溶液晶种分解过程。 关键词：铝酸钠溶液；表面活性剂；强化；晶种分解 中图分类号：TF 821 文献标识码： A Effect of nonionic surfactant on seeded precipitation of sodium aluminate solution PENG Zhi-hong, LIU Yan-ting, ZHOU Qiu-sheng, LIU Gui-hua, LI Xiao-bin (School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China) Abstract: The effects of a nonionic surfactant on the seeded precipitation rate of sodium aluminate solution, the particle size and morphology of the products were studied. The results show that when the added amount of the nonionic surfactant ranges from 100 mg/L to 150 mg/L, the seeded precipitation rate can be raised by about 6%, and its accelerating effects on the agglomeration of Al(OH)3 crystals and inhibiting secondary nucleation are also found in terms of the particle size distribution and SEM, which results in the increase of the average radius of products by 16 μm. The mechanism of the surfactant behavior was discussed. The results indicate that the Zeta potential of Al(OH)3 particle is changed and surface tension of sodium