本研究針對鋰三元電池正極材料進行金屬資源再生之研究，實驗主要分為三大部分，第一部分為鋰三元電池正極材料的特性分析及酸溶浸漬研究，藉由化學成分分析、表面特性分析及結晶相分析，作為後續研究規劃之依據。再以探討各項酸溶浸漬之實驗參數，得到最佳化之浸漬參數，鋰、鈷、鎳、錳之浸漬效率皆達98.5%以上，並透過浸漬反應動力學之研究，得到此浸漬反應決定步驟為表面化學反應及內擴散反應混合控制機制，各金屬之浸漬活化能分別為鈷47.25 kJ/mol、鎳45.25 kJ/mol、錳44.74 kJ/mol、鋰27.70 kJ/mol。
本研究之第二部分為金屬分離純化之研究，主要方法透過溶媒萃取及選擇性化學沉澱進行金屬分離，並使用分離係數（Separation factor）、分配比（Distribution ratio）、萃取效率及沉澱效率作為指標數據。首先使用Na-Cyanex 272進行第一階段萃取分離，將鈷、錳離子進行選擇性萃取，鋰、鎳離子則留於萃餘液中。有機相中之鈷、錳離子藉由反萃取過程回到水溶液中，並使用Na-D2EHPA作為萃取劑進行二階段萃取分離，將錳離子萃取至有機相，鈷離子留於萃餘液中，再利用反萃取使錳離子回到水相。鋰、鎳離子則透過丁二酮肟進行選擇性化學沉澱，藉由鎳離子與丁二酮肟形成紅色難溶錯合物，使鋰、鎳有效分離。
第三部分為金屬產物析出之研究，根據最終產物之不同，分別使用兩種研究步驟，第一種為濃縮結晶法，藉由減壓濃縮製成硫酸鈷與氯化鎳；第二種為化學沉澱法，利用碳酸鈉及氫氧化鈉進行化學沉澱反應，得到碳酸鋰與金屬氫氧化物之沉澱物，經高溫煅燒後，得到氧化鈷、氧化鎳、氧化錳。鋰、鈷、鎳之產物純度皆達99.5%以上，錳之產物純度亦達93.3%。

The paper is focused on the improved process of waste NMC cathode materials from LIBs by using hydrometallurgical methods. In the acid leaching step, the essential effects of acidity concentration, oxidizing reagent concentration, leaching time, liquid-solid mass ratio and reaction temperature with the leaching percentage are investigated. The cathode material is leached with 2M H2SO4 and 10 vol.% H2O2 at 70 ˚C and 300 rpm using a liquid-solid mass ratio of 30 ml/g and the leaching efficiency of Co is 98.5%, Li is 99.8%, Ni is 98.6% and Mn is 98.6% under optimum conditions. In order to improve the recovery process, this paper design the proper separation process to recover valuable metals. The leach liquor in the recovery process is used Cyanex 272 to extract Co and Mn into organic phase at first. Secondly, Co and Mn are separated by using D2EHPA and high purity of Co will be obtained. Thirdly, the Ni is selectively extracted by using dimethylglyoxime and Ni will completely to form a solid complex. Finally, the remaining Li in leach liquor is recovered as Li2CO3 precipitated by saturated Na2CO3. On the other hand, Co is recovered as Co3O4 and CoSO4, Ni is recovered as NiO and NiCl2 and Mn is recovered as Mn3O4 in chemical precipitation process and rotary evaporation process.

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