Abstract
Plasma melting is one of the best ways to treat effectively a wide variety of wastes. The present study is focused to develop a new plasma recycle process for hazardous wastes, especially for electroplating sludge, which contains several percentages of heavy metals such as Ni and Cr. In-flight treatments of electroplating sludge were made by DC non-transferred arc with different plasma environments at reduced pressure. X-ray diffraction (XRD) results revealed the phase composition of both treated powders and deposits. Deposits prepared from N 2–O 2 plasma showed thermal stability. From energy dispersive X-ray spectroscopy (EDX) elemental analysis, it is found that heavy metals such as Ni, Cr and Zn are concentrated in collected powders. In this process both recovery of Ni and Cr metals and converting of residual sludge into non-leachable slag are being pursued.
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