Experimental investigation of matte-slag interactions in copper flash smelting

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Hellsten, Niko
dc.contributor.advisor Naakka, Ville
dc.contributor.author Guntoro, Pratama
dc.date.accessioned 2017-09-04T12:56:34Z
dc.date.available 2017-09-04T12:56:34Z
dc.date.issued 2017-08-29
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/27956
dc.description.abstract Much of the studies related to copper flash smelting focuses on the burner and reaction shaft, while settler part of the furnace is not much evaluated. In the settler part, matte and slag separation take place, and it is critical in determining the final matte grade. In this thesis, a novel experimental procedure is employed to evaluate the time-dependent behavior of matte during settling process. Copper concentrate and synthetic slag mixture of known SiO2/Fe ratio was contacted at 1300oC in air atmosphere and inert Argon atmosphere. The ratio corresponded to the actual fluxing ratio of an industrial flash smelting furnace (SiO2/Fe 0.7 – 1.0). The experiments were carried out at several different reaction times, and subsequently analyzed with SEM-EDS to see the progression of matte-slag interactions and reactions. Additional experiments were also conducted by introducing 5-10 mm sized crushed printed circuit boards (PCB) to the mixture. These additional experiments provide initial analysis regarding how the minor metals in the PCB behave in copper smelting. A comprehensive and detailed information about the sequential steps leading to the matte settling from the slag are described in the present work. It was found that oxygen mass transport in slag is the limiting factor of the overall reaction rate. Separation and settling of matte ceased after 10 minutes, while continuous feeding of air leads to total loss of matte to the slag phase after just 5 minutes, with Cu content in the matte reaching peak level after 2-3 minutes. Precious metals in the PCB mostly distributed to the matte to create a Cu-Fe alloy phase distributed rather randomly within the matte. The novel procedure employed in the present work is generally sufficient to qualitatively elaborate the matte-slag separation process, but not quantitatively. en
dc.format.extent 118+8
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.title Experimental investigation of matte-slag interactions in copper flash smelting en
dc.type G2 Pro gradu, diplomityö fi
dc.contributor.school Kemian tekniikan korkeakoulu fi
dc.subject.keyword matte settling en
dc.subject.keyword time-dependent behaviour en
dc.subject.keyword PCB smelting en
dc.subject.keyword matte separation en
dc.identifier.urn URN:NBN:fi:aalto-201709046855
dc.programme.major European Mineral Engineering Course fi
dc.programme.mcode CHEM 3006 fi
dc.type.ontasot Master's thesis en
dc.type.ontasot Diplomityö fi
dc.contributor.supervisor Jokilaakso, Ari
dc.programme Erasmus Mundus Minerals and Environmental Programme fi
dc.ethesisid Aalto 9529
dc.location P1

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