反应结晶法处理含锌废水  

Treatment of zinc-containing wastewater by reaction crystallization method

作　　者：周秋生[1] 张芳[1] 李小斌[1] 齐天贵[1] 刘桂华[1] 彭志宏[1] 

机构地区：[1]中南大学冶金与环境学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2015年第1期351-357,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51274243)~~

摘　　要：基于结晶学原理,采用低温反应结晶法处理含锌废水,利用扫描电镜、粒度分析和红外光谱等分析手段考察结晶操作方式、添加剂、Ostwald熟化对含锌废水净化过程及颗粒结晶行为的影响。研究结果表明:连续无溢流操作方式下主要以初级成核为主,反应产物粒度较小,而采用连续溢流操作有利于颗粒附聚和长大;添加相对分子质量适中的聚乙二醇(PEG)系列添加剂能明显提高除锌效果,所得反应产物颗粒粗、结构相对致密且形貌规整;熟化能改善反应结晶产物的粒度分布并增大其平均粒径。The zinc-containing wastewater was treated by reactive precipitation method based on crystallization principles. Influences of operation mode, additives and Ostwald ripening on the wastewater treatment and the crystallization behavior of zinc hydroxide particles were investigated by the scanning electron microscope, particle size distribution and infrared spectrum analysis. The results show that the primary nucleation is dominant in the continuous operations without overflow, while the crystal growth and agglomeration are primary in continuous operations with overflow. Additives of polyethylene glycol（PEG） with appropriate relative molecular mass can obviously increase Zn2＋removal efficiency and large particles with compact structure and regular morphology can be obtained. Moreover, Ostwald ripening can improve the particle size distribution and increase the mean particle size of the reaction crystallization products.

关 键 词：反应结晶 含锌废水 操作方式 添加剂 熟化 

分 类 号：O781[理学—晶体学] X522[环境科学与工程—环境工程]