Upgrading copper slag cleaning tailings for re-use

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Upgrading copper slag cleaning tailings for re-use. / Holland, Keiran; Eriç, R. Hürman; Taskinen, Pekka; Jokilaakso, Ari.

In: Minerals Engineering, Vol. 133, 15.03.2019, p. 35-42.

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@article{9dec6f4f5792489f88e15771f31fa450,
title = "Upgrading copper slag cleaning tailings for re-use",
abstract = "Tailings from an industrial copper slag cleaning milling and flotation circuit have been pre-reduced at low temperatures, well below its melting point, using CH4-H2-Ar mixtures with the aim of metallizing its iron oxide component to metallic iron. The treatment carried out at 700–900 °C, with a duration of up to 90 min, indicated a complete transformation of magnetite within the first 30 min of the process. At the same time, significant fractions of its harmful impurities, antimony, arsenic, bismuth, lead and zinc, present as oxides in the slag were reduced from magnetite and the glassy inter-granular phase, and removed from the slag as flue dust in the process off-gas. The obtained fine slag powder with low impurity contents can be melted after the pre-reduction to synthetic rock or to fast cooled slag granules for further use.",
keywords = "Hydrocarbons, Reduction kinetics, Slag utilization, Smelting, Volatilization",
author = "Keiran Holland and Eri{\cc}, {R. H{\"u}rman} and Pekka Taskinen and Ari Jokilaakso",
year = "2019",
month = "3",
day = "15",
doi = "10.1016/j.mineng.2018.12.026",
language = "English",
volume = "133",
pages = "35--42",
journal = "Minerals Engineering",
issn = "0892-6875",

}

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TY - JOUR

T1 - Upgrading copper slag cleaning tailings for re-use

AU - Holland, Keiran

AU - Eriç, R. Hürman

AU - Taskinen, Pekka

AU - Jokilaakso, Ari

PY - 2019/3/15

Y1 - 2019/3/15

N2 - Tailings from an industrial copper slag cleaning milling and flotation circuit have been pre-reduced at low temperatures, well below its melting point, using CH4-H2-Ar mixtures with the aim of metallizing its iron oxide component to metallic iron. The treatment carried out at 700–900 °C, with a duration of up to 90 min, indicated a complete transformation of magnetite within the first 30 min of the process. At the same time, significant fractions of its harmful impurities, antimony, arsenic, bismuth, lead and zinc, present as oxides in the slag were reduced from magnetite and the glassy inter-granular phase, and removed from the slag as flue dust in the process off-gas. The obtained fine slag powder with low impurity contents can be melted after the pre-reduction to synthetic rock or to fast cooled slag granules for further use.

AB - Tailings from an industrial copper slag cleaning milling and flotation circuit have been pre-reduced at low temperatures, well below its melting point, using CH4-H2-Ar mixtures with the aim of metallizing its iron oxide component to metallic iron. The treatment carried out at 700–900 °C, with a duration of up to 90 min, indicated a complete transformation of magnetite within the first 30 min of the process. At the same time, significant fractions of its harmful impurities, antimony, arsenic, bismuth, lead and zinc, present as oxides in the slag were reduced from magnetite and the glassy inter-granular phase, and removed from the slag as flue dust in the process off-gas. The obtained fine slag powder with low impurity contents can be melted after the pre-reduction to synthetic rock or to fast cooled slag granules for further use.

KW - Hydrocarbons

KW - Reduction kinetics

KW - Slag utilization

KW - Smelting

KW - Volatilization

UR - http://www.scopus.com/inward/record.url?scp=85059801211&partnerID=8YFLogxK

U2 - 10.1016/j.mineng.2018.12.026

DO - 10.1016/j.mineng.2018.12.026

M3 - Article

VL - 133

SP - 35

EP - 42

JO - Minerals Engineering

T2 - Minerals Engineering

JF - Minerals Engineering

SN - 0892-6875

ER -

ID: 31363565