Reaction Sequences in Flash Smelting and Converting Furnaces: An In-depth View

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Volume Title

A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Date

2021-10

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en

Pages

19
3524-3542

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Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, Volume 52, issue 5

Abstract

Flash smelting and flash converting are mature technologies in copper and nickel sulfide smelting. The sensitivity of operation concerning the furnace design is evident. It is obvious that when two unit operations are carried out in separate spaces in the same furnace, skills related to maintenance of suspension oxidation of fine minerals, fluxing, fluid as well as heat flows and the overall energy balance are required. Despite these fundamental features, the flow-sheet wide understanding of linking the suspension oxidation of sulfides with the subsequent smelting processes in the furnace as well as the chemistry of its off-gas train is largely absent in the scientific literature. This review gives a detailed outlook on the microscale phenomena in flash smelting and flash converting furnaces accumulated during the last decades. It connects their vital features and chemistries with the reaction tendencies and heat fluxes in the different parts and reaction zones of the furnace as well as in the off-gas train from the smelter to the acid plant.

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The authors are indebted to Dr. Katri Avarmaa for her suggestions and assistance when preparing the final version of this manuscript. The CFD simulation images of the FSF RS as well as the equipment pictures provided by Metso-Outotec Oyj are greatly acknowledged.

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Citation

Taskinen, P & Jokilaakso, A 2021, ' Reaction Sequences in Flash Smelting and Converting Furnaces: An In-depth View ', Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, vol. 52, no. 5, 104649, pp. 3524-3542 . https://doi.org/10.1007/s11663-021-02283-7