Abstract
AbstractThe theory of cumulative exergy analysis of complex technological processes is summarized. Technological assessments are made of a proposed Sulphation Roast Leach (SRL) process, and commercial Imperial Smelting (IS) and Roast Leach Electrowin (RLE) processes for zinc production. Assessments are made in terms of the specific cumulative exergy consumption and cumulative degree of thermodynamic perfection for zinc production.The IS process is found to be superior in terms of these criteria when the steps for the preparation of the feed material to the processes are not taken into account. This results from the low usage of electricity in the process relative to the SRL and RLE processes.For the total processing of a complex mineral sulphide ore, a selective sulphation (e.g. SRL process) is superior due to its ability to handle wide variations of feed composition. Adoption of the process could essentially eliminate discharge to the environment of harmful metal sulphides with concomitant improved metal...
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