Vitrification of Electroplating Sludge

• Main Authors: Sheng-Feng Fu, 傅聖峰
• Other Authors: Wen-Jhy Lee
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/51612334221794950018

碩士 === 國立成功大學 === 環境工程學系碩博士班 === 92 === 　　Electroplating technique is used worldwide because it can prevent materials from wear and corrosion, etc. Although electroplating technique is cheaper than others, it usually causes serious pollution to environment. Electroplating sludge contains high concentrations of heavy metals which are hazardous to environment. Therefore it is necessary to develop a good technique to treat electroplating sludge, even to made it a reusable material. This study is focused on the treatment of electroplating sludge by melting process, and the effluence of melting process from different basicity and additive is investigated. The transformation and leaching of heavy metals before and after melting process were also analyzed to evaluate the detoxifying quality of molten sludge. 　　The results of this study are summarized as follows: The electroplating sludge can be treated by the melting process and is well detoxified under 1450℃. When single electroplating sludge is treated, the volume reduction and weight reduction ratio are 90.7 % and 37.0 % respectively. It shows that the melting process has the advantage of high volume and weight reduction ratio. When electroplating sludge was mixed with high ratio of additive, its basicity was lower. The additive could make melting process more efficient, and this contributed to reduce heavy metal leaching. The molten slag became smooth and hard in surface structure, glass luster and it had no apparent pore. The porosity of slag phase was between 0.63 % and 4.71 %, the water adsorption was between 0.32 % and 1.58 %. The compressive strength of some slag could reach 200 kg/cm2. The water tolerant and compress strength of some slag could reach 15 % and 150 kg/cm2, corresponding to the first grade brick standard. It is thus feasible to recover the molten sludge as a recover resource.