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系統識別號 U0026-0308201715252500
論文名稱(中文) 鉭質電容器中鉭資源再生技術研究
論文名稱(英文) Recovery of tantalum from tantalum capacitors
校院名稱 成功大學
系所名稱(中) 資源工程學系
系所名稱(英) Department of Resources Engineering
學年度 105
學期 2
出版年 106
研究生(中文) 林冠言
研究生(英文) Kuan-Yan Lin
電子信箱 kaunyanlin@gmail.com
學號 N46041185
學位類別 碩士
語文別 中文
論文頁數 88頁
口試委員 口試委員-向性一
口試委員-王立邦
口試委員-吳俊毅
指導教授-陳偉聖
中文關鍵字 鉭電容  加壓浸漬  溶媒萃取  資源化 
英文關鍵字 Tantalum capacitors  Pressure Leaching  Solvent Extraction  Recovery 
學科別分類
中文摘要 鉭電容具有體積小、容量大等優點,因此作為電子產品中主要使用之電容器。每年全世界超過175噸鉭電容提供給台灣使用,而我國面對其龐大之使用量時,卻無法將廢棄鉭電容做適當處理,因此本研究將針對鉭電容中的鉭資源開發出一套回收流程,且最終產物以達化學材料需求等級。
本研究之鉭電容回收流程可以分成三部分,先以前處理去除部分之雜質元素,接著以濕法冶金方式分離鉭與其他元素並純化之,最後製備出高純度之氧化鉭產物。在回收流程之前,本研究先對鉭電容進行特性分析,發現鉭電容中含有超過40 wt %的鉭且存在於電極體中,因此需用前處理方式將鉭電容中之電極體與其餘物理組成部分做一分離,經由前處理過後的鉭電極體中除了鉭,錳為含量次多之元素,因此需研究最佳之鉭、錳分離方法,首先利用氫氟酸將鉭電容中的鉭、錳溶出於溶液中以利後續採用濕法冶金分離兩元素,經由浸漬後分別選用選擇性化學沉澱法與溶媒萃取法相互比較其鉭、錳分離效果,發現選擇性化學沉澱法在沉澱鉭的時候,部分的錳有共沉現象產生,分離效果不佳,而經由溶媒萃取之後的鉭、錳分離係數 β_(Ta/Mn)高達198801,兩元素在此方法中具有極佳之分離效果,經沉澱、煅燒後可獲得純度高達99.9%以上之五氧化二鉭且整體鉭回收率達98%,達成廢棄鉭電容資源化之目的。
英文摘要 Tantalum capacitor which has the small sizes and large capacity per unit volume, was used in electronic appliances widely. About 175 tons of tantalum capacitors is used in Taiwan every year, but we couldn’t treat waste tantalum capacitors. The recovery process of tantalum from tantalum capacitors should be studied and be set up in Taiwan. Over 40 wt% Ta contained in the tantalum capacitor electrode which was sealed with epoxy resin. The study recycling process included pre-treatment, leaching and solvent extraction. In the pre-treatment, the epoxy resin containing SiO2 and wire consist of Fe, Ni was removed from tantalum capacitor powder. After pre-treatment, Ta and Mn distributed averagely in tantalum capacitor powder. This study would use hydrometallurgy to remove Mn and refine high purity Ta2O5. At first, the pressure leaching by hydrofluoric acid was used to leach Ta and Mn from tantalum capacitor powders. The acid concentration, reaction time, temperature and solid-liquid ratio were examined. After leaching process, selective chemical precipitation and solvent extraction was used to separate Mn with Ta. But Mn would produce co-precipitation with Ta in selective chemical precipitation, so the Alamine 336 was used to extract tantalum from the leaching solution. The condition of pH value, extractant concentration, extraction time and aqueous-organic ratio were investigated. Then, Ta was stripping by HNO3, the condition of concentration, stripping time and organic- aqueous ratio was studied. With the optimal condition, the Ta2O5 with 99.9068% purity was obtained after chemical precipitation and calcination.
論文目次 中文摘要 I
EXTENDED ABSTRACT II
致謝 XI
目錄 XIII
表目錄 XV
圖目錄 XVI
第一章 緒論 1
1-1 前言 1
1-2 研究動機與目的 3
第二章 理論基礎與文獻回顧 4
2-1 鉭及鉭電容介紹 4
2-1-1 鉭 Tantalum 4
2-1-2 鉭質電容器 6
2-2 提煉冶金技術 8
2-3 預處理 13
2-4 浸漬反應機制 16
2-5 溶媒萃取之理論基礎 18
2-5-1 萃取與反萃 18
2-5-2 萃取劑與稀釋劑 18
2-5-3 萃取率及反萃率的計算 21
2-6 鉭電容資源化現況 23
第三章 實驗方法與步驟 28
3-1 實驗材料 28
3-1-1樣品來源 28
3-1-2實驗藥品 29
3-2 實驗架構 30
3-3 實驗流程 31
3-3-1鉭電容物化性質分析及前處理 31
3-3-2前處理 32
3-3-3 酸浸漬 33
3-3-4 選擇性化學沈澱分離 35
3-3-5 溶媒萃取分離 35
3-3-6 五氧化二鉭析出 38
3-4 鉭電容物化性質分析儀器 39
第四章 結果與討論 42
4-1 鉭電容物化分析 42
4-2 鉭電容之前處理 48
4-3 鉭電容浸漬溶出 53
4-4 選擇性化學沈澱法 63
4-5溶媒萃取純化及分離 64
4-5-1 鉭、錳的萃取分離 64
4-5-2 鉭的反萃 70
4-6 化合物析出及純度分析 75
第五章 結論 79
第六章 鉭電容回收流程建議 80
參考文獻 82
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