EDTA

论文编号:HG153  论文字数:10192,页数:26

 摘 要：钴、镍是贵重的有色金属，重要的战略原料，但资源匮乏，并随着其资源的日益枯竭，对它们的分离与回收就显得十分重要。通过对相关文献进行调研，总结了目前国内外钴与镍的分离与回收技术的现状：目前常用的方法有化学沉淀法、萃取法和树脂法,详细介绍了相关的研究和应用，对其他方法进行了简单介绍。研究了在EDTA-2Na存在下，用电渗析的方法对NiCl2•6H2O与CoCl2•6H2O的混合溶液进行分离。描述了电学规律，考察了Ni2+与萃取剂摩尔比、料液室流量、原料浓度、电流密度、镍钴摩尔比对分离效果的影响。结果表明：Ni2+与萃取剂摩尔比1:1，料液室流量适中(70L/h)，原料浓度越高(Ni2 +浓度2.0 g/L)，电流密度20.0mA/cm2，镍钴摩尔比1.2:1对分离效果好。
 关键词：钴；镍；EDTA-2Na；电渗析；络合

Abstract: Co and Ni are valuable non-ferrous metals, and important strategic raw materials, but resources is lack and shortage, the separation and recovery of Co and Ni become more important. Through the investigation of relative literatures, the technical status at home and abroad is summarized. The current conventional methods are chemical precipitation, extraction and ion-exchange resin. The related research and application are introduced in detail, the other methods are simple introduced. The separation of nickel and cobalt was studied using electrodialysis in the presence of EDTA-2Na. The electrical laws were described. The molar ratio of Ni2 + and exratctant, liquid chamber flow, raw material concentration, current density, the molar ratio of nickel and cobalt on the effect of separation were studied. The results showed that: the molar ratio of Ni2 + and extractant is 1:1, moderate liquid flow in chamber (70L/h), the higher the concentration of raw materials (Ni2 + concentration of 2.0g/L), current density 20.0mA/cm2, the molar ratio of nickel and cobalt is 1.2:1 have good effect on the separation.
Keywords：Cobalt;Nickel;EDTA-2Na;Electrodialysis;Complexation

目  录
中文摘要 I
英文摘要. II
目 录 III
1. 绪论 1
1.1  化学沉淀分离 1
1.2  溶剂萃取分离 1
1.3  离子交换分离法 3
1.4  聚合物-盐-水液-固萃取(非有机溶剂液固萃取)法 3
1.5  氧化还原法 4
1.6  膜分离技术法 4
1.7  电反萃取法 4
2. 实验部分 6
2.1  分离原理 6
2.2  实验设备 7
2.3  实验试剂与原料 7
2.4  实验操作 7
3. 实验结果与讨论 8
3.1  钴与镍浓度分析关联 8
3.2  EDTA-2Na波长扫描 12
3.3  考察络合时间 12
3.4  实验参数行为规律 13
3.5  单因素考察 15
4. 总结与展望 20
致谢 21
参考文献 22