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題名 | 濕式冶金法資源化電弧爐煉鋼煙塵之研究=Study on the Resources Recycling from EAF Dust by Hydrometallurgy |
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作者姓名(中文) | 蔡敏行; 吳士豪; 陳偉聖; | 書刊名 | 鑛冶 |
卷期 | 43:3=167 1999.09[民88.09] |
頁次 | 頁93-104 |
分類號 | 454.89 |
關鍵詞 | 電弧爐煉鋼煙塵; 濕式冶金; 資源化; EAF dust; Hydrometallurgy; Resources recycling; |
語文 | 中文(Chinese) |
中文摘要 | 目前國內電弧爐煉鋼年產量達900萬噸,同時也產生約18萬噸的煉鋼煙塵。此等煙 塵因顆粒微細、體比重小,且富含鋅、鉛、鎘、鉻等重金屬成分,遇風到處飛揚,遇水溶出 重金屬,業經毒性溶出試驗證實,鋅、鉛、鎘等溶出量均超過環保規定值,若未經妥善處理 而任意丟棄,易造成嚴重環境污染且危害人體健康,因此已被列為有害事業廢棄物,同時也 被指定為必須資源化處理的廢棄物之一。 本研究首先以稀硫酸將煙塵中易溶之氧化鋅、氯化鋅溶出,而將浸漬液電析回收鋅金屬 ,殘渣再以HCl+NaCl溶液浸漬將鉛去除,並對此含鉛浸漬液提出回收處理方法。研究結果顯 示,以2NNaCl的鹽酸酸性溶液,在溫度60℃的條件下,鉛之浸出率達95%以上,此浸漬液經由 氧化沈澱法,可使所含之大部份鉛離子形成PbO�祠H澱、分離後之浸漬液再以HC1調整酸濃度 ,即可循環再使用。經此浸漬處理的最後殘渣可符合TCLP測試標準,可將有害事業廢棄物的 煙塵轉變成有的磁性材料,如此可建立一套電弧爐煉鋼煙塵之濕式冶金法資源化流程。 |
英文摘要 | It was estimated that 9,000,000 tons of electric arc furnace (verified EAF) steels were produced in Taiwan each year. Meanwhile, 180,000 tons of EAF dust were generated. The EAF dust, in the form of extremely fine particles, was composed of heavy metals, such as zinc and lead. It was verified by the Toxicity Characteristic Leaching Process (TCLP) that the concentrations of Zn, Pb and Cd in the filtrate were far above the criteria. It could cause serious pollution problems without careful management. It was recognized as a hazardous waste, and had to be reclaimed as resources. Zinc oxide and zinc chloride were easily leached out by dilute sulfuric acid. The filtrate was recovered as zinc metals by electrolysis. The residues were further leached by HCl+NaCl solution to remove Pb and the recovery of Pb and the recovery of Pb-containing filtrate was proposed in this study. The experimental results indicated that the concentration of Pb in the filtrate was similar to the theoretical values. The filtrate was further oxidized to precipitate PbO��. After the solid/liquid separation, the filtrate was adjusted by adding HCl and then sent back to leaching process to recirculate. The residues from leaching comply with the standards of TCLP test. In this way, the hazardous wastes (EAF dust) become useful magnetic materials, and the reclaiming process of EAF dust can be established. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。