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

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Juho Lehmusto, Daniel Stenlund, Mari Lindgren, Patrik Yrjas
Publisher: Springer US
Publication year: 2017
Journal: Oxidation of Metals
Journal acronym: Oxid. Met.
Volume number: 87
Issue number: 1-2
Start page: 199
End page: 214
eISSN: 1573-4889


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 deposit formation and corrosion rate. The rate of build-up increased as a function of process gas temperature, which was 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 rate increased as a function of process gas temperature. Iron sulphate (FeSO4 or Fe2(SO4)3) was found at the interface between the deposit and the corroded metal surface, suggesting that corrosion was induced by sulphuric acid (H2SO4) from the reaction between SO3 (originating from SO2 in the process gas) and water vapour.


Keywords

Deposit build-up rate, Dew point corrosion, Flash smelting, heat recovery boiler

Last updated on 2019-26-06 at 05:53