以改良胺類萃取劑搭配酸浸法回收二次鋰電池中鈷金屬之研究
| 中文摘要 | 科技的進步、電子產品的普及化使得電子廢棄物的回收成為世界各地備受關注的重要議題之一，電子產品產生各式各樣的電池廢棄物，國內外已有多項研究使用磷類萃取劑回收廢棄電池中金屬，因此本研究以胺類萃取劑搭配電化學程序回收廢棄鋰離子電池中金屬鈷等有價元素。本研究蒐集廢棄鋰離子電池，以鹼浸漬、煆燒等前處理取得之正極材料，並以超音波震盪，酸溶條件：2 M硫酸、固液比20 g/L、H2O2還原劑添加比例2 vol%、浸漬溫度60℃、浸漬時間60分鐘條件等進行溶出實驗，結果顯示鈷金屬溶出率可達70.67%。以TOA及Aliquat 336兩種胺類萃取劑，參數包括pH值、萃取時間、萃取劑莫耳比等條件，探討各金屬的萃取效率。結果顯示以TOA萃取時，用2M硫酸搭配8M鹽酸進行酸溶，以pH 4、莫耳比=3、反應20分鐘後所得鈷萃取率可達到97.24%，後續電解實驗結果顯示以定電流15 mA/cm2於陰極還原產生鈷金屬沉積之電流效率最佳，反應2小時內維持在30%。此外鈷、錳及鎳去除效率於6小時即可達近100%。鈷回收速率快於鎳，考量分離及純化效果，建議電沉積時間150分鐘，鈷、鎳還原效率分別為85%、60%，而錳則100%於陽極回收二氧化錳。高電流密度15 mA/cm2，陰極回收鈷金屬純度達98%，低電流密度5 mA/cm2時，鈷純度更達99.7%。 | ||
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| 中文關鍵字 | 胺類萃取劑、電化學、廢棄鋰電池、鈷 | ||
基本資訊
| 專案計畫編號 | EPA-108-XB07 | 經費年度 | 108 | 計畫經費 | 1000 千元 |
|---|---|---|---|---|---|
| 專案開始日期 | 2019/01/01 | 專案結束日期 | 2019/11/30 | 專案主持人 | 施育仁 |
| 主辦單位 | 回收基管會 | 承辦人 | 蔡雅如 | 執行單位 | 國立中山大學 |
成果下載
| 類型 | 檔名 | 檔案大小 | 說明 |
|---|---|---|---|
| 期末報告 | EPA-108-XB07 期末報告(定稿).pdf | 2MB |
Study on recovery of cobalt metal from secondary lithium battery by modified amine extractant combined with acid leaching
| 英文摘要 | With development in high-tech industry and electronic products have made recycling electronic waste one of the most important issues worldwides. Many researches focus on the recovery of waste battery using the phosphorus extractant for selective separation of valuable metals. This study aims to develop the amine-based extractant for recycling Co in lithium-ion batteries. In this study, the cathode materials after NaOH soaking and calcination were dissolved within 2 M sulfuric acid under 20 g/L solid loading, 2 vol% of H2O2 as reducing agent at 60 °C for 60 min. The acid dissolution rate of cobalt assisted with ultrasound attained 70.67%. Then, the extraction of metals from the acid liquid were conducted using TOA and Aliquat 336 amine-based extractants. The extracting parameters include pH, extraction time and molar ratio of extractant. The extracting efficiency of cobalt using TOA as extractant from 8M HCl and 2M H2SO4 reaches 97.24% at pH 4, molar ratio = 1 in 20 min. Results of electrolysis showed that the current efficiency of recovering Co metal on the cathode attained around 30% under a constant current 15 mA/cm2 within 2 hours. Further, removal efficiencies of Co, Mn and Ni reached 100% in 6 h. Since the reduction rate of Co is greater than that of Ni, the electrodeposition time was suggested to be 150 min, at which the recovery of Co and Ni were 85% and 60%, respectively, to increase the purity of Co metal. Almost 100% of Mn was removed as manganese dioxide over the anode surface. Under the low current density of 5 mA/cm2 the purity of cathodic Co metal was 99.7%; as increasing the current density to 15 mA/cm2, Co metal coule be still properly recovered with a purity as high as 98% . | ||
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| 英文關鍵字 | Amine extractant, Electrochemistry, Waste lithium batteries, Cobalt | ||