Theoretical simulation and experimental study on nickel, cobalt, manganese separation in complexation–precipitation system
Theoretical simulation and experimental study on nickel, cobalt, manganese separation in complexation–precipitation system
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DOI：
10.1016/j.seppur.2013.01.044
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发表时间：
2013-04
影响因子：
8.6
通讯作者：
Liwen Ma;Z. Nie;X. Xi;Li Xiaokang
中科院分区：
文献类型：
--
作者：
Liwen Ma;Z. Nie;X. Xi;Li Xiaokang
The theoretical simulations and experiments on metal separation in complexation–precipitation system of Me(Ni, Co, Mn)–OH−–NH3–CO32-were carried out. The Gibbs free energy change ΔG for metal precipitation reactions was calculated. The ΔG–pH curves showed that the precipitation difficulty order was Mn>Co>Ni at pH range of 8–11. Separation experiments indicated that Mn and Co were able to precipitate successively in solution of different compositions mainly in the forms of carbonates. pH, initial carbonate concentration [C] and initial ammonia concentration [N] had different influence on Ni, Co and Mn precipitation behaviors: the separation effect was best at about pH 10; [C] had little effect on the metal separation in the [C] range of 0.05–0.4mol/L; changing [N] could regulate precipitation step by step, as Ni in solution and Mn/Co in precipitate at [N] 1mol/L, and Ni/Co in solution and Mn in precipitate at [N] 2.5mol/L. The experimental results basically consisted with the theoretical predictions. The Ni solution after Mn/Co precipitation could be electrodeposited to obtain Ni metal. Finally a separation process in complexation–precipitation system of Me(Ni, Co, Mn)–OH−–NH3–CO32-characterized by the theoretical simulation was proposed, of which the Ni, Co and Mn precipitation could be predicted or controlled by flexibly importing parameters of [C], [N], pH, etc. The process can provide a reference to metal comprehensive recovery from similar nickel–cobalt secondary resources.
