EDTA-2Na絡合強化電滲析分離Co、Ni離子

化工論文編號:HG153  論文字數:10192,頁數:26

目  錄
中文摘要 I
英文摘要. II
目 錄 III
1. 緒論 1
1.1  化學沉淀分離 1
1.2  溶劑萃取分離 1
1.3  離子交換分離法 3
1.4  聚合物-鹽-水液-固萃取(非有機溶劑液固萃取)法 3
1.5  氧化還原法 4
1.6  膜分離技術法 4
1.7  電反萃取法 4
2. 實驗部分 6
2.1  分離原理 6
2.2  實驗設備 7
2.3  實驗試劑與原料 7
2.4  實驗操作 7
3. 實驗結果與討論 8
3.1  鈷與鎳濃度分析關聯 8
3.2  EDTA-2Na波長掃描 12
3.3  考察絡合時間 12
3.4  實驗參數行為規律 13
3.5  單因素考察 15
4. 總結與展望 20
致謝 21
參考文獻 22

 摘 要：鈷、鎳是貴重的有色金屬，重要的戰略原料，但資源匱乏，并隨著其資源的日益枯竭，對它們的分離與回收就顯得十分重要。通過對相關文獻進行調研，總結了目前國內外鈷與鎳的分離與回收技術的現狀：目前常用的方法有化學沉淀法、萃取法和樹脂法,詳細介紹了相關的研究和應用，對其他方法進行了簡單介紹。研究了在EDTA-2Na存在下，用電滲析的方法對NiCl2•6H2O與CoCl2•6H2O的混合溶液進行分離。描述了電學規律，考察了Ni2+與萃取劑摩爾比、料液室流量、原料濃度、電流密度、鎳鈷摩爾比對分離效果的影響。結果表明：Ni2+與萃取劑摩爾比1:1，料液室流量適中(70L/h)，原料濃度越高(Ni2 +濃度2.0 g/L)，電流密度20.0mA/cm2，鎳鈷摩爾比1.2:1對分離效果好。
 關鍵詞：鈷；鎳；EDTA-2Na；電滲析；絡合

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