鈷(Co)是鋰電池(LIBs)陰極材料中重要的元素，鋰電池的應用日漸興盛使鈷的需求迅速增長。從廢棄鋰電池中回收鈷和鋰(Li)已成為一項重要的任務。本研究的目標是藉由浮除分離法來探討混合溶液中鈷與鋰的分離效果，此混合溶液為模擬廢棄鋰電池回收過程中所產生的溶液。鈷的回收率受到界面活性劑的種類和界面活性劑濃度的影響。溶液中含有10 mg/L的鈷和10 mg/L的鋰，在pH值 5.5、鈷與界面活性劑的莫爾比為1:8、氮氣流速為40 mL/min的情況下使用十二烷基硫酸鈉（SDS）、十二烷基苯磺酸鈉（SDBS）和十六烷基硫酸鈉（SHS）分別可回收98.1％、90％和62.63％的鈷。使用辛基硫酸鈉（SOS）無法有效的回收鈷。陰離子界面活性劑通過靜電作用力吸附帶正電的鈷離子，並產生泡沫使鈷離子與水溶液分離。而鋰離子與陰離子界面活性劑之間的靜電作用力弱導致鋰無法與水溶液分離。在pH值9時有98%的鈷沉澱形成Co(OH)2，其表面帶正電仍然可以被陰離子界面活性劑吸附並且有高的鈷回收率。鈷的回收率隨著氣體流量的增加而增加，高氣體流量能將更多的氣體引入浮除柱，從而提供更多機會使界面活性劑吸附在氣泡上並產生更多的泡沫以提高鈷的回收率。初步結果表明使用浮除分離可以從回收廢棄鋰電池產生的溶液中回收鈷和鋰。

Cobalt (Co) is a key element in the cathode material of lithium–ion batteries (LIBs). With the rise in LIBs applications, demand of Co continues to grow rapidly. Recycling of Co and Li from spent LIBs has become an important task. The objective of the study is to investigate flotation separation of Co and Li in mixed solution, which simulates the solutions generated in the recycling of spent LIBs. Recovery efficiency of Co was affected by type of surfactant and surfactant concentration. Solution contained 10 mg/L of Co and 10 mg/L of Li, at pH 5.5, molar ratio ([Co]:[surfactant]) of 1:8, and 40 mL/min of N2, 98.1%, 90%, and 62.63% of Co was recovered when use sodium dodecyl sulfate (SDS), sodium dodecyl benzene sulfonate (SDBS), and sodium hexadecyl sulfate (SHS), respectively. Sodium octyl sulfate (SOS) was not an effective collector. Cationic species of Co became adsorbed on anionic surfactant via electrostatic interaction, and was separated from aqueous solution with foams. Li was hardly separated from solution because of its weak electrostatic interaction with anionic surfactant. High recovery efficiency of Co was found at pH 9, because 98% of Co precipitated as Co(OH)2, whose surface was positively charged and anionic surfactant could become adsorbed. Recovery efficiency of Co increased with increasing N2 flow rate. High gas flow rate induces more gas bubbles into the flotation column and therefore provides more opportunities for surfactant to adsorb on gas bubbles and produces more foams to improve Co recovery. Preliminary results showed flotation separation could potentially be used in recycling Co and Li from spent LIBs.

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