本研究針對LaNi5儲氫合金回收鎳、鈷、錳金屬，實驗主要分為四個部分。第一部分為LaNi5儲氫合金的材料特性分析，探討樣品的表面特性、化學成分組成與結晶相組成，並藉由分析結果規劃整體實驗流程。第二部分為選擇性氨浸漬，利用三元氨浸漬系統，將鎳、鈷金屬形成氨錯離子，溶解至水溶液中，鑭金屬則留在固相。氨浸漬將探討不同實驗參數下金屬之浸漬效率，得到最佳氨浸漬參數，鎳、鈷之浸漬效率分別為98%與97%，並藉由浸漬反應動力學之研究，得知氨浸漬反應機制為混合控制機制，鎳、鈷之浸漬活化能分別為16.48 kJ/mol與15.15 kJ/mol。
第三部分為金屬分離純化，主要方法為溶媒萃取。溶媒萃取實驗分為兩階段，第一階段使用Na-D2EHPA萃取劑，將錳離子進行選擇性萃取，鎳、鈷離子則留在水相。第二階段以Na-Cyanex 272為萃取劑，將鈷離子萃取至有機相，鎳離子則留在水相。在Na-D2EHPA與Na-Cyanex 272有機相中之金屬離子皆透過不同pH值的反萃劑進行兩階段反萃取，分別得到高純度之含錳、鈷離子水溶液。
第四部分為金屬化合物析出，根據含有不同金屬離子之水溶液，分別使用化學沉澱法與濃縮結晶法。含有錳離子的水溶液以次氯酸鈉為沉澱劑，產生二氧化錳沉澱，沉澱物經酸洗後鍛燒，得到純度為99.03%的三氧化二錳；含有鎳離子與鈷離子的水溶液皆使用化學沉澱法與濃縮結晶法，產生氫氧化物沉澱與硫酸化合物，硫酸鎳與硫酸鈷純度分別為99.24%與99.80%，氫氧化物再經由鍛燒，得到一氧化鎳與四氧化三鈷，純度分別為99.29%與99.70%。

The LaNi5 hydrogen storage alloy is recognized as one of the leading materials in hydrogen storage technology, which contains valuable metals such as nickel, cobalt, and manganese. This study aims to recover these metals from waste LaNi5 alloy by using the hydrometallurgical method. Selective ammoniacal leaching is designed to dissolve nickel and cobalt while preventing the leaching of lanthanum. The chemicals applied in the leaching process were ammonia, ammonium carbonate, and hydrogen peroxide. The evaporation method would be used to deal with the ammoniacal leach liquor, recovering the ammonia solution, and obtaining a solid that contains nickel and cobalt. The solid was then dissolved using sulfuric acid, and the metal ions in the leach liquor were separated by solvent extraction. First, Mn2+, Fe3+, Al3+, and La3+ were extracted into the organic phase using D2EHPA. Ni2+ and Co2+ in the aqueous phase were separated utilizing Cyanex 272, secondly. After that, the metal ions in the organic phase were stripped in two stages to obtain high-purity Mn2+ and Co2+ in the sulfuric acid solutions. The metal compounds were subsequently recovered by chemical precipitation or evaporation procedures. Mn2+ precipitated as MnO2 by reacting with NaClO, then calcined to obtain Mn2O3. Ni2+ and Co2+ both reacted with NaOH to precipitate their respective hydroxides, then calcined to obtain NiO and Co3O4, respectively. Ni2+ and Co2+ were also recovered as NiSO4 and CoSO4, using the evaporation method.

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