鋰電池為目前最常見也是最常使用的電池，也因為人們的大量使用及製造，因此所伴隨的大量的鋰電池廢棄物造成的嚴重的環境問題，此議題值得我們做探討。本研究先利用破碎機將鋰電池破碎後，再通過篩分的方式取的粉末後，以濕法冶金方式回收鋰電池中的有價金屬。
本研究內容為利用酸浸漬及化學沉澱。以檸檬酸、硫酸、鹽酸等三種酸分別對正極
粉末做酸浸漬已得到富含鋰、鈷、鎳、錳等元素的浸漬液。檸檬酸浸漬效率為
Li:96%、Co: 91% 、Ni: 98% 、Mn: 99%。硫酸、鹽酸的各金屬浸漬效率都可以達
到95%以上。
所得到的浸漬液分別有透過檸檬酸、鹽酸、硫酸所得到的浸漬液，本實驗選擇以鹽酸浸漬的浸漬液作為沉澱實驗所用之液體，透過選擇性化學沉澱法做沉澱，分別先將錳所沉澱下來，錳沉澱為黑色的粉末，錳沉澱後的浸漬液顏色呈現暗粉紅色，在將暗粉紅色浸漬液做鈷與鎳沉澱，，鈷、鎳所共沉所得之沉澱物顏色呈現淡粉紅色或是偏灰粉色，將鈷與鎳共同沉澱下來後可以得到透明無色地浸漬液，這些浸漬液中只會剩下鋰，之後再透過減壓縮儀進行減壓濃縮可以得到綠色的固體。
所得到之錳的黑色固體錳純度達到99%，在沉澱錳的同時鈷的損失率只有6%。
沉澱物應為錳氧化物組成，可能含有多種錳氧化物型態，如二氧化錳、四氧化三錳等型態。鈷與鎳所得之沉澱物為灰粉紅色，純度達到99%，應該為草酸鈷與草酸鎳的型態，同時對鋰的沉澱影響很小，幾乎不沉澱。透過減壓濃縮儀所得到之綠色固體，應為氯化鎳，其純度亦達到99.9%。

Lithium batteries are the most commonly used batteries at present, and because of the large number of people using and manufacturing them, the serious environmental problems caused by the final disposal of waste lithium battery are worth discussing. In this study, the lithium battery was first crushed by a crusher, the powder obtained was then sieved and collected. The valuable metals in the lithium battery was recovered by a hydrometallurgy process. The research contents include the use of acid leaching and chemical precipitation. Acid leaching of the cathode electrode powder with three kinds of acids such as citric acid, sulfuric acid, and hydrochloric acid, resulted in an leaching solution rich in lithium, cobalt, nickel, manganese.
The leaching solution obtained by hydrochloric acid leaching was selected as the liquid used for the precipitation experiments. Precipitation was performed first by a selective chemical precipitation method and manganese was first precipitated as black powders. The color of the leaching solution after manganese precipitation changed to dark pink and the liquid is full of cobalt and nickel. Then, cobalt and nickel were co-precipitated by ammonium citric and the precipitates obtained are pale pink or grayish pink. After precipitating of cobalt and nickel, only lithium was left in the transparently and colorlessly leaching liquid. Finally, lithium was concentrated by reduced pressure evaporation and a green lithium salt was obtained.

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