Deposit build-up and corrosion in a copper flash smelting heat recovery boiler

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Internal Authors/Editors


Publication Details

List of Authors: Juho Lehmusto, Daniel Stenlund, Mari Lindgren, Patrik Yrjas
Editors: B. Pint, D. Monceau, M. Vilasi, Y. Wouters, S. Chevalier, C. Desgranges
Publication year: 2016
Book title: HTCPM 2016 - 9th International Symposium on High-Temperature Corrosion and Protection of Materials
Title of series: CEFRACOR, EFC event
Number in series: 402
Start page: 234
End page: 235


Abstract

The aim of the work was to improve the understanding of deposit formation and corrosion in a copper flash smelting plant, focusing on the effects of process gas temperature (400 - 900 °C) and heat-transfer surface temperature (160 - 320 °C) on the deposit formation and corrosion rate. The rate of build-up increased as a function of process gas temperature, which can be explained by a larger extent of sintering at higher temperatures, resulting in slagging and thus, in better adhesion of particles hitting the surface. The corrosion rates increased as a function of process gas temperature. Iron sulphate (FeSO4 or Fe2(SO4)3) was found at the interface between the deposits and the corroded metal surface, suggesting that corrosion was induced most likely by sulphuric acid (H2SO4) from the reaction between SO3 (originating from SO2 in the process gas) and water vapor.


Keywords

corrosion, deposit build-up rate, flash smelting process, heat recovery boiler

Last updated on 2019-16-09 at 06:25