ELECTROLYTIC ZINC PRODUCTION FROM CRUDE ZINC OXIDES WITH THE EZINEX~ò PROCESS

摘要

The crude zinc oxides (CZO) produced in any thermal process dealing with EAF dust also contain lead, cadmium, and a considerable amount of halides (chlorides and fluorides). The high halide contents make these crude zinc oxides less and less attractive, both technically and economically, and a further refining procedure is necessary to meet the zinc and zinc oxide market requirements. Hydrometallurgical techniques commercially used to dehalogenate the crude zinc oxides are not effective enough to upgrade the crude zinc oxides to the required specification for their direct use in the traditional sulphuric electrolysis by primary zinc producers. The EZINEX~ò PROCESS has solved the problem of the halides contained in the crude zinc oxides. This process is the only proven technology electrowinning zinc from a chloride-based electrolyte in a conventional cell house. This paper discusses the process economics taking the data from feasibility studies of different size commercial plants.