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系統識別號 U0026-0812200914223442
論文名稱(中文) 無鉛銲錫廢料金屬回收之研究
論文名稱(英文) Study of Metal Recovery from Lead-Free Solder Waste
校院名稱 成功大學
系所名稱(中) 材料科學及工程學系碩博士班
系所名稱(英) Department of Materials Science and Engineering
學年度 96
學期 2
出版年 97
研究生(中文) 王韶韋
研究生(英文) Shau-wei Wang
電子信箱 n5695112@ccmail.ncku.edu.tw
學號 N5695112
學位類別 碩士
語文別 中文
論文頁數 111頁
口試委員 指導教授-李世欽
口試委員-陳錦毅
口試委員-張世賢
口試委員-王聖璋
口試委員-陳繁雄
中文關鍵字 分離  電化學  回收  濕式冶煉法 
英文關鍵字 separation  hydrometallurgy  electrochemistry  recovery 
學科別分類
中文摘要 中文摘要
本研究主要是探討回收無鉛銲錫廢料中金屬的可能性,目前無鉛銲錫的主要成分為錫/銀/銅合金,實驗將針對這三種金屬不同的化學性質,利用濕式冶煉法制定各種流程來分離錫、銀和銅,再進一步個別回收。
實驗結果顯示,一開始銲錫廢料使用10M以上的濃硝酸溶解後,99%以上的錫金屬能形成偏錫酸沉澱並回收。剩下主要由銀、銅離子組成的溶液,主要以三種方法回收,最佳條件如下:第一種方法是將銀離子轉換成氰化銀錯離子,電解回收銀金屬(電壓-1.5V,40oC,經3小時達99%回收率、純度97.7%、電流效率70%);第二種方法是以銅線置換溶液中的銀(常溫下、40分鐘、回收率98%、純度99.1%);第三種方法以5M鹽酸和銀離子反應形成氯化銀,接著利用聯氨還原法(常溫下、pH=10、30ml聯氨劑量、回收率99%、純度99.3%),高溫還原法(1000oC、60分鐘、碳酸鈉重量比40%,回收率83%、純度98.6%)及電解法,電解法是將氯化銀轉換成硫代硫酸銀錯離子電解回收(常溫、電壓-0.6V、6小時、回收率99%、純度98.3%、電流效率74%),或是形成銀氨錯離子電解回收(常溫、電壓-0.5V、5小時、回收率99%、純度99.0%、電流效率43%)。
英文摘要 ABSTRACT
This research mainly discussed the possibility of recovering metals from lead-free solder waste. Immediate lead-free solder was composed of Sn-Ag-Cu alloy. The experiment will aim at different chemical property of three metals to decide different procedures to separate the Sn, Ag and Cu, then further recovery individually.
The experimental result showed that we can convert Sn2+ to H3SnO3 by using 10M HNO3 for the beginning, then used three different methods to recycle Ag+ form the remaining solution. The first method was adding NaCN, then recovery Ag by electrolysis, and the best condition was at 40oC, -1.5V v.s SCE for 3 hours to yield 99% recovery, 97.7% purity and 70% current efficiency. The second method was using copper wire to replace Ag+ at 25oC, 40 minutes to yield 98% recovery and 99.1% purity. The last method was adding 5MHCl to form AgCl first, then reduced AgCl to Ag by N2H4 (25oC, pH=10, 30 ml N2H4 dosage) to get 99% recovery and 99.3% purity, or by smelting with ratio of 40% Na2CO3 at 1000oC, 60 minutes can yield 83% recovery and 98.3% purity. In electrolytic process, we transformed AgCl to Ag(S2O3)23- or Ag(NH3)2+ complex ions. The best condition for Ag(S2O3)23- was at 25 oC , -0.6V v.s SCE for 6 hours to get 99% recovery, 98.3% purity, 74% current efficiency and for Ag(NH3)2+ was at 25 oC , -0.5V v.s SCE for 5 hours to get 99% recovery, 99.0% purity, 43% current efficiency.
論文目次 總目錄
中文摘要 I
ABSTRACT II
總目錄 III
表目錄 VI
圖目錄 VIII

第一章 前言 1
第二章 文獻回顧 3
2.1 濕式冶煉法之介紹 6
2.2 回收與純化 7
2.2-1 元素置換法 7
2.2-2 傳統沉澱法 8
2.2-3 電解還原法 8
2.3 金屬的浸漬特質 23
2.3-1 銀 23
2.3-2 銅 23
2.3-2 錫 24
2.4 循環伏安法介紹 26
2.5 剝錫廢液的處理方法 28
2.6 含銀廢液的處理方法 30
第三章 實驗方法與步驟 35
3.1 實驗設備 35
3.2 實驗藥品 35
3.3 實驗流程 41
3.4 實驗步驟 42
3.4-1 收集無鉛銲錫廢料 42
3.4-2 研磨過篩與高溫熔煉 42
3.4-3 酸溶 42
3.4-4 固液分離 43
3.4-4-1 加入氰化鈉 43
3.4-4-2 加入鹽酸 43
3.4-4-3 以銅線置換 43
3.4-5 電解法 44
3.4-6 回收物的分析觀察 44
第四章 結果與討論 50
4.1 銲錫廢料之組成分析 50
4.2 酸溶試驗 52
4.3 加入氰化鈉的分析(銀回收) 56
4.3 (續)氰化銅錯離子回收(銅回收) 64
4.4 以銅線置換分析 68
4.4-1 浸漬液pH對銀回收之影響 68
4.4-2 置換時間 68
4.4-3 置換溫度 69
4.4 (續)置換後溶液中銅離子回收 74
4.5 生成氯化銀沉澱(加入鹽酸) 79
4.5-1 聯氨還原 81
4.5-2 高溫還原 86
4.5-3 電解還原 89
4.6 XRF定量純度分析 103
第五章 結論 105
參考文獻 106
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