應用液相-液相萃取法回收工業焚化灰渣中鈰金屬資源之研究

Recovery of Cerium from Industrial Waste Incinerator Ash using Liquid to Liquid Extraction

戴華宇(Dyah Wahyu Untari)

指導教授 ： 游勝傑

共同指導教授 ： 王雅玢(YA-FEN WANG)

中原大學/工學院/環境工程學系/碩士(2022年)

https://doi.org/10.6840/cycu202200063

摘要

廢棄物最終處置仍然是廢棄物處理中的一個問題，焚化爐是當今處理固體廢棄物的最有效方式，焚化處理後產生的飛灰可能會污染大氣和其他環境成分，若能將有害廢棄物中的金屬回收再利用，也可提供有害廢棄物減污的另一思維。鈰是一種準金屬，也是飛灰中常見的稀土元素，此研究針對袋式集塵灰、水洗塔冷卻灰和Venturi洗滌灰進行測試，利用環境友善化學試劑進行萃取回收，並評估其結果。
實驗針對浸出劑、濃度、溫度、攪拌時間和固液比利用田口式實驗設計法進行研究，結果顯示，最佳浸出條件為 1 M 檸檬酸、1/100 固液比和室溫下 5 小時的參數組合。浸出實驗最顯著的特徵是袋式集塵灰的酸性類型和 S/L 比，其統計p 值分別為 0.002 和 0.004。液-液萃取成功地從袋式集塵灰中提取了 100% 鈰，葵花油中含有 0.04 M D2EHPA，而葵花油中 0.04 M 的 TBP 從水洗塔冷卻灰中提取了 100% 鈰，而葵花油中不同濃度的 TBP 可以傳輸 100% 鈰來自Venturi洗滌灰。

關鍵字

垃圾焚燒灰 ； 濕法冶金 ； 鈰 ； 環境友善 ； 田口式設計法

並列摘要

Waste disposal is still a problem in waste processing. Incinerators are the most effective way to dispose of solid waste today. Fly ash may pollute the atmosphere and other environmental components. The recovery element is one of the approaches that may be utilized to deal with harmful substances. Cerium is a common rare-earth element in fly ash. Because cerium is a metalloid, its elemental form is challenging to detect. This research evaluates the best recovery method for baghouse, cooling, and venture scrubber ash performing with a hydrometallurgical process using environmentally friendly and familiar chemical agents.
The leaching agent, concentration, temperature, stirring time, and solid to liquid ratio were studied. The Taguchi technique improved the leaching process to decrease the number of tests using different parameter combinations. The optimal leaching conditions were 1 M citric acid, 1/100 solid to liquid, and 5 hours at room temperature. The leaching experiment's most significant characteristics were the baghouse ash's acid type and S/L ratio with p-values of 0.002 and 0.004, respectively. Liquid-liquid extraction has successfully carried 100% cerium from baghouse ash with 0.04 M D2EHPA in sunflower oil, while TBP in sunflower oil at 0.04 M convey 100% cerium from cooling ash, whereas TBP in sunflower oil at various concentrations could transmit 100% cerium from venture scrubber ash.

並列關鍵字

waste incinerator ash ； hydrometallurgical process ； cerium ； environmental friendly ； Taguchi method

參考文獻

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