C.Z.O. Treatment: Wash And Sulphate E.W. Or Directly To EZINEX®?

Abstract:

Significant amounts of secondary zinc bearing materials are converted in C.Z.O., which is an attractive feed for the production of zinc metal in conventional processes. The ISP, one of the traditional technologies using this C.Z.O. material, is phasing out and most of the plants based on this technology are not in operation. This is moving C.Z.O. towards its use in zinc sulphate E.W. Unfortunately, the C.Z.O. cannot be fed directly to the sulphate E.W. Instead, it has to be carefully washed to reduce the content of harmful elements as chlorides. Also, after the removal of these harmful elements, the presence of other elements commonly requires the blending of this material with traditional feed.The EZINEX® Process, a zinc E.W. based on a chloride bearing electrolyte developed by Engitec Technologies, allows the direct treatment of C.Z.O., without washing, even if it is the primary feed. Engitec Technologies also successfully piloted a thermal technology, the INDUTEC® Process, which is able to convert secondary zinc bearing material to C.Z.O. The combination of these two technologies can be used to recover zinc coming from many different sources

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