台灣的鉛蓄電池稽核認證回收量近年來持續上升，而廢鉛蓄電池中含有大量金屬鉛，必須回收再利用。目前台灣廢鉛蓄電池處理廠皆採用傳統的火法冶煉，此法易產生大量SO2酸性氣體、CO2溫室氣體及含鉛煙塵和含鉛爐渣等廢棄物，因此發展濕法冶金回收鉛技術，可望能減少火法冶煉對環境的污染以及有害事業廢棄物的產生。
本研究整合「氯鹽萃取」與「電解法」兩項濕式冶金技術回收鉛膏中的鉛，以取自國內某廢鉛蓄電池處理廠之鉛膏為樣品，經初步篩網過篩後，利用XRD及EDS分析其主要組成為PbO、PbO2、Pb2(SO4)O，鉛含量約77 wt%。在氯鹽萃取實驗中，探討固液比(S/L)、Cl-濃度、HCl濃度和浸漬溫度對鉛膏浸漬溶出鉛效果的影響。結果顯示，在最佳條件下：180 min、S/L = 0.02 kg/L、浸漬溫度70℃、[Cl-] = 4.73 M、[HCl] = 1.0 M，鉛萃取率可達99 %以上，並溶解99.9 wt%的鉛膏量。
靜置萃取溶液待冷卻後，接續電解法實驗，以不銹鋼陰極片電鍍鉛金屬，及DSA(IrO2@Ti)陽極網電沉積二氧化鉛，回收萃取液中鉛的，探討電流、及萃取階段HCl濃度、Cl-濃度對電解鉛回收率的影響。結果顯示，在最佳電解條件下：180 min、[HCl] = 1.0 M、[Cl-] = 3.32 M、S/L = 0.02 kg/L、I = 6.0 A，鉛回收率可達96.5 %。

There are a lot of lead in waste lead-acid batteries. So, batteries should be recycled properly for recovery of lead. At present, All of waste lead-acid batteries plants in Taiwan use pyrometallurgical technique. But this technique will produce high lead content of byproducts and cause SO2 pollution. Consequently, this study tries to use hydrometallurgical technique to recover lead. This study uses HCl-NaCl system to dissolve lead paste and recover lead by electrolysis. Effectiveness of Pb extraction ratio by leaching lead paste was then evaluated by varying [Cl-], [HCl], S/L and temperature. Experimental results revealed that Pb extraction ratio was higher than 99 % at leaching time of 180 min, S/L of 0.02 kg/L, [Cl-] of 6.14 M, [HCl] of 1.0 M and temperature of 50 ℃ with dissolving 99.9 wt% of lead paste. After leaching, the solution cooled to room temperature, and electrolyzed with DSA anode and stainless steel tube cathode. Experimental results revealed that lead recovery was 96.5 % at electrolysis time of 180 min, [Cl-] of 3.32 M, [HCl] of 1.0 M and current intensity of 6.0 A. Lead was recovered on the cathode as metallic lead.

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