熱浸鍍鋅浴槽浮渣再生製程技術開發

The Recycling of Top Dross of Continuous Galvanizing Line

10.30069/MM.201809_62(3).0007

游瑞坤(J. K. Yu)；江連桂(L. K. Chiang)；林玉才(Y. C. Lin)；方琮淦(T. K. Fang)

熱浸鍍鋅 ； 浮渣 ； 再生 ； continuous galvanizing ； top dross ； recycling

鑛冶：中國鑛冶工程學會會刊

62卷3期（2018 / 09 / 01）

59 - 64

繁體中文

熱浸鍍鋅浴槽生產時，無可避免會產生相當可觀之浮渣，純度在90wt.%以上，具有相當高之回收價值。但浮渣中之主要介在物η-Al_5Fe_2Zn_X(x≈0.9)與渣中之氧化膜混在一起，不易與鋅液分離。一般而言，浮渣中之η相粒子可利用其與鋅液比重差異，在600 ∼ 700℃靜置令其上浮分離；但浮渣中膜狀之氧化物，嚴重阻礙η相粒子上浮，使得熔湯黏度異常升高。此外，為了降低回收料之Fe含量，添加的Al也使會熔渣黏度提高，添加量過多，會降低回收率。因此本研究在處理過程中，添加適量之flux及Al，並利用機械震動降低浮渣之黏度，結果發現回收效果相當好，可得到70%以上之清淨鋅液。

The top dross is inevitably formed on the surface of the zinc tank during continuous galvanizing. Ninety percent of the top dross is zinc that is worthwhile for recycling. The major inclusion η-Al_5Fe_2Zn_X(x≈0.9) in the top dross when mixed with oxide film makes it difficult to separate from zinc melt by conventional recycling process. The addition of Al for removing Fe also increased the viscousity of dross that reduced the recycling efficiency. In this study, we used proper flux and Al addition and mechanical vibration to recycle high purity of zinc with over 70% recovery rate.

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