利用蝕刻廢液製備鹼式氯化銅之研究

A Study on the Preparation of Copper Trihydroxy Chloride from Etching Waste Solution

劉晁宏(Chao-Hung Liu)

指導教授 ： 蔡德華老師

國立臺北科技大學/工程學院/化學工程所/碩士(2006年)

摘要

在印刷電路板工業中，蝕刻液是屬於高用量及高污染性質的液體，本研究使用化學沈降法由酸性氯化銅蝕刻廢液中製備鹼式氯化銅[CuCl2.3Cu(OH)2]。鹼式氯化銅有許多應用，最重要的是被廣泛的配製成可濕性粉末，做為農業的殺菌劑。並可從蝕刻液回收有用的資源，以達到廢棄物資源化再利用之永續經營。
本研究是依據印刷電路板廠所產生之酸性氯化銅蝕刻廢液，依其性質，配置模擬含銅離子(Cu2+)與自由酸(HCl)之蝕刻廢液。在固定反應溫度、反應時間及攪拌速率之情況下，在酸性蝕刻液中加入5 N NaOH水溶液，沉澱產生，再以70 ℃∼80 ℃之熱水洗滌以除去雜質。由實驗結果顯示，並經由DLS、XRD、TGA、AA等儀器分析後，發現鹼式氯化銅在pH 4.5到pH 8.5之間形成，其分子架構為CuCl2.3Cu(OH)2；接著改變酸性蝕刻液的配置比例，實驗結果發現當酸性蝕刻液的比例CuCl2.2H2O：HCl之莫耳數比為3：1時，且pH值控制在pH6.5時，為最佳操作條件，形成的鹼式氯化銅綠色結晶粉末粒徑極小，懸浮粒徑可達28.45nm，其Cu2+含量大於58%。

關鍵字

印刷電路板 ； 蝕刻廢液 ； 殺菌劑 ； 鹼式氯化銅

並列摘要

Etchants are high consumption and high pollution of the printed circuit board industry, this research used chemical precipitation method to prepare copper trihydroxy chloride [CuCl2.3Cu(OH)2] from wasted etching liquid containing acidic copper chloride. It has a number of applications, by far the most important being as an agricultural fungicide for which purpose it is extensively employed in formulated form as wettable powders. Retrieval of the valuable natural resource from waste etching solution, this way is in order to reach the waste recovery and sustainable development.
In this study, synthesis wasted liquids containing various concentration of copper ion (Cu2+) and free acid (HCl) were prepared in order to simulate the real characteristics of wasted etching liquid containing acidic copper chloride which is generated from the printed circuit board (PCB) industry. Fixed the reaction temperature, reaction time and rate of stir, by addition of 5N sodium hydroxide into the acidic etchant, precipitation occurs. Washed the product to remove the impurities by 70 ℃∼80 ℃ water. This results of experiment shows：To analyze by DLS、XRD、TGA、AA, the copper trihydroxy chloride is formed from pH4.5 to pH8.5, its molecular structure is CuCl2.3Cu(OH)2. Then change the ratio of etching liquid, this results of experiment find that when the molar ratio CuCl2.2H2O：HCl = 3：1, and pH value is controlled in pH6.5 have the optimum operate condition, the particle size of green crystallization powder is extremely small, suspending particle size is 28.45nm, and obtain contains of over 58 % of Cu2+ .

並列關鍵字

Printed Circuit Board ； Wasted Etching Solution ； Fungicide ； Copper Trihydroxy Chloride

參考文獻

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