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    Title: 都市垃圾焚化飛灰水萃液中鉛離子回收再利用之研究
    Other Titles: A study on the lead recovery from the extraction wastewater of MSWI fly ash
    Authors: 曾聖閔;Tseng, Sheng-min
    Contributors: 淡江大學水資源及環境工程學系碩士班
    高思懷
    Keywords: 飛灰水萃液;CO2沉降;鉛離子回收;PbCl2;化學動力式;MSWI fly ash extraction wastewater;CO2-sparging precipitation;lead recover;lead chloride;chemistry dynamics
    Date: 2010
    Issue Date: 2010-09-23 17:56:00 (UTC+8)
    Abstract: 近年針對都市垃圾焚化飛灰再利用之研究蓬勃發展,飛灰內含大量的氯鹽,如直接使用會影響產品上之可利用性,因此氯鹽的去除便成了飛灰再利用前必備的流程,水萃為目前最為普遍之前處理方式。水萃過程中,除了將氯鹽萃取出來,也會萃出大量的鉛離子。本研究利用化學沉降法及通入CO2的方式結合溼式冶金的概念來回收鉛,並同時嘗試以連續式流程測試未來實廠應用之可能性。最後並針對CO2通入水萃液中的實驗結果,進行動力式的推估。
    由結果中可得知,利用化學沉降法(pH 10)或是通入CO2(0.5 L/min,30分鐘),對水萃液中的鉛都有很好的分離效果,分別是99.54%及99.82%。化學沉降法產生的污泥利用溼式冶金方式,無論是採用硝酸或是鹽酸萃取(1、3、6N,L/S=6),對於鉛之回收效果有其限制,主要是添加的硫酸根限制了鉛與其他離子結合的可能性。採用CO2曝氣沉降污泥進行鹽酸萃取(3N,L/S=6),則可以得到純度85.96%的PbCl2,佔原始水萃液中鉛含量的98.6%;若把萃取過程中產生的廢液注入另一股新鮮的水萃液,第二輪的試驗中也可得到純度88.06%的PbCl2,可見水萃液中98%以上的鉛可藉由此程序以高純度PbCl2的型態回收,結果也顯示發展成一個連續式流程的可能性。從化學動力式的實驗中可得,通入CO2主要是中和水萃液中的OH-,並且可推估出反應速率大致符合擬一階的條件,速率常數為0.1805 min-1。因此,本研究對於飛灰水萃液不但可有效回收廢水中之鉛,且具有處理或回收廢水之潛力。
    The research of MSWI fly ash reuse grows vigorously in recent years, but including plenty of chlorine salts inside, it will influence the feasibility of recovery as the construction materials, so remove chlorine salts from the fly ash becomes the necessary procedure before reusing. Water extraction deal with the way for being most general at present. This procedure is not only extract chloride salt, also a large amount of lead ion. This research utilize chemistry precipitation(pH 10) and CO2-sparging precipitation(0.5L/min, 30mins) combine the hydrometallurgical to recover lead from extraction wastewater, and the continuous procedure was confirmed the possibility which be using on site. Finally it designed a chemistry dynamics test.

    According to results, the chemistry precipitation and CO2-sparging precipitation separate the lead from extraction wastewater successfully, 99.54% and 99.82% respectively. The chemistry sludge was extracted by HNO3 and HCl(1, 3, 6N, L/S =6), the lead can’t separate from the sludge, because of the sulfate. The CO2-sparging precipitation sludge was extracted by HCl(3N, L/S =6), precipitate the PbCl2 sludge that purity was 85.96%, and lead was 98.6% of the totally original content in the extraction wastewater. The extraction procedure produced another extracted acid wastewater, add into a fresh fly ash extraction wastewater, named second round procedure. Following the CO2-sparging precipitation and HCl extracted procedure, precipitate the PbCl2 sludge that purity was 88.06%. The chemistry dynamics fit pseudo-first-order supposed, and the rate constant was 0.1805 min-1.
    Appears in Collections:[水資源及環境工程學系暨研究所] 學位論文

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