110

2,056 千元

補助及獎勵回收清除處理暨再生利用

2021/01/01

2021/11/30

蔣本基

回收基管會

徐伊亭

國立臺灣大學

廢棄物管理

電化學分離純化技術、金屬浸漬劑、氮氧化物減量

Electrochemical separation and purification technology, Metal leaching reagent Nitrogen oxide reduction

許景翔；潘述元

蔣本基

02-23622510#

pcchiang@ntu.edu.tw

本研究與優勝奈米有限公司進行合作，將廢鋰鈷電池中的鋰、鈷金屬進行回收與分離純化，採用硝酸搭配剝離劑能夠有效提高金屬的提取效率，過程中產生硝酸廢液以減壓蒸餾法進行廢酸回收，蒸餾後的結晶將以水溶解後進入電化學模組進行分離與純化。本研究目標為建立廢鋰鈷電池回收製程，包含浸漬劑開發及電化學分離技術發展、以減壓蒸餾法回收浸漬廢液中的硝酸、以及建立其工程面、經濟面及環境面綜合技術評估。 研究結果發現，在50 g廢鋰鈷電池粉末浸漬試驗中，發現硝酸具有較高的提取效率，並且以68%硝酸175 ml搭配75 ml UW-530剝除劑，在溫度80 oC、固液比1：5的情況下具有鈷99.1%及鋰99.5%的高提取效率，並且在放大量體1 kg測試中，以同樣比例條件可提取99.93%及99.85%的鋰、鈷。此外，將提取液進行減壓蒸餾後，可減少廢液率達93.5%；針對電化學分離模組測試部分，以配置含有1 g/L鈷及0.5g/L鋰溶液進行批次實驗，在外加電壓16伏特下、70分鐘內，可達成鋰離子99.9%及鈷離子98.6%的分離效率，其能耗分別為鈷0.019 kWh/g、鋰0.011 kWh/g，產率為17.4 g/hr/m2及30.8 g/hr/m2；於實廠廢水中，鋰的含量可由原本4.40%純化至29.25%，鈷之占比為53.45%提升些許純度，其能耗為0.020 kWh/g及0.098 kWh/g。

電化學分離純化技術、金屬浸漬劑、氮氧化物減量

EPA-110- XB09期末報告.pdf

3MB

成果報告

2022/2/1 上午 12:00:00

This research cooperated with UWin Nanotech Co., Ltd. to recover, separate and purify lithium and cobalt metals in waste lithium-cobalt batteries. The use of nitric acid with impregnant can effectively improve the extraction efficiency of metals. In the process, nitric acid waste liquid treated by vacuum distillation to recover the waste acid before discharge, and the crystals after distillation will be dissolved in water for the electrochemical module for separation and purification. The goal of this research is to establish a waste lithium cobalt battery recycling process, including the development of impregnant and electrochemical separation technology, the recovery of nitric acid in the impregnation waste liquid by vacuum distillation, and the establishment of a systematic functional assessment of its environment, economy and engineering. The results of the study found that in the 50 g waste lithium cobalt battery powder immersion test, it was found that nitric acid has a higher extraction efficiency, and 175 ml of 68% nitric acid was used with 75 ml of UW-530 impregnant, at a temperature of 80 oC, solid-liquid ratio of 1:5, it has a high extraction efficiency of 99.1% cobalt and 99.5% lithium, and for a 1 kg test with a larger volume, 99.93% and 99.85% of lithium and cobalt can be extracted under the same conditions. In addition, the waste liquid after metals stripping was treated by vacuum distillation. After vacuum distillation, the amount of waste liquid can be reduced by 93.5%, For the separation of electrochemical module, the batch experiment is carried out with a solution containing 1 g/L Cobalt with 0.5 g/L lithium, and the applied voltage is 16 volts. Within 70 minutes, a separation efficiency of 99.9% for lithium ion and 98.6% for cobalt ion can be achieved. The energy consumption is 0.019 kWh/g cobalt and 0.011 kWh/g lithium with productivity 17.4 g/hr/m2 and 30.8 g/hr/m2. For real sample, the proportion of lithium can be purified from 4.40% to 29.25% in base recovery cell, and the proportion of cobalt is 53.45% purity in acid recovery cell. The energy consumption of cobalt and lithium are 0.020 kWh/g and 0.098 kWh/g.

Electrochemical separation and purification technology, Metal leaching reagent Nitrogen oxide reduction