以生物可降解稀釋劑及非生物可降解稀釋劑從廢水中萃取鋰金屬

Lithium Extraction Using Biodegradable Diluent and Non-biodegradable Diluent from Wastewater

張拉拉(Nurma Istifara)

指導教授 ： 游勝傑 ； 王雅玢

中原大學/工學院/環境工程學系/碩士(2021年)

https://doi.org/10.6840/cycu202100909

摘要

摘要
水系統中的重金屬污染已經引起全球環境問題，因為人類技術的進步重金屬的使用有所增加，同時受到資源有限的影響。負載液膜（SLM）法在金屬回收中得到廣泛應用，其萃取和汽提過程相結合，具有高選擇性，受到高度關注。通過用生物溶液代替非生物溶液進行有機稀釋，該方法對環境友好並提高了適用性。另外，對於提取系統內的各項提取參數的函數進行測量，包括水相的pH值、提取時間、提取濃度、和有機相的組成進行了研究。通過 1 M D2EHPA 在向日葵油中以 O: A＝1:15 的比率，並於pH 3 狀態下震盪混合 20 分鐘，溶劑萃取的最佳參數將達到 89% 。鋰濃度使用 1M HCl 汽提並按照 A:O=1:4 比例製備。從溶劑萃取中選擇的參數應用於 SLM 工藝的比例為進料：萃取劑：汽提劑為 2:1:1/4。 SLM 循環在 240 分鐘內向汽提劑提供了相較原濃度 6 倍的濃縮進料，從最初的 230 ppm 增加到 1380 ppm。此外， SLM 機器的回收效率為 75%。這表明植物油具有有機稀釋的能力，並具有很高的加工效率，在未來有發展的潛力。

關鍵字

鋰 ； 可生物降解稀釋劑 ； 溶劑萃取 ； 汽提 ； SLM

並列摘要

ABSTRACT
Heavy metals contamination in water systems had a posed global environmental concern because people are more inclined to use technology, the use of heavy metals has increased, along with the effect of limited resources these days. The Supported Liquid Membrane (SLM) method is being widely applied in metal recovery, highly focus on to the combination of the process of extraction and stripping, with high selectivity. By replacing non-bio solution with bio-solution for organic dilution, the method is environmentally friendly and has increased applicability. In addition, extraction systems were measured as a function of various extraction parameters, including pH value of aqueous phase, extraction time, extraction concentration, and composition of the organic phase were investigated. Optimum parameters for solvent extraction by using shaker for mixing the solution via 1 M D2EHPA in Sunflower Oil by O: A = 1: 15 ratio, pH 3 within 20 minutes has reached 89% as the optimum. Lithium concentration will be stripped using 1 M HCl; by A: O = 1: 4 ratio to be prepared. Selected parameter from solvent extraction applied to SLM process of Feed: Extractant: Stripping Agent Ratio is 2:1:1/4. The SLM cycle provided an enriched feed of 6 times higher compare to initial concentration to stripping agent from initial 230 ppm to 1380 ppm within 240 minutes. Moreover, the SLM machine has a recovery efficiency of 75%. This shows that vegetable oils have the ability to dilute organically, and give high processing efficiency, with potential applications in the future.

並列關鍵字

Lithium ； Biodegradable Diluent ； Solvent Extraction ； Stripping ； SLM

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