Institute of the Comprehensive Exploitation of Mineral Resources of the Russian Academy of Sciences (Moscow, Russia):

Shadrunova I. V., Head of Department, Doctor of Engineering Sciences, Professor, shadrunova_@mail.ru
Kolodezhnaya E. V., Leading Researcher, Candidate of Engineering Sciences, kev@uralomega.ru

Nosov Magnitogorsk State Technical University (Magnitogorsk, Russia):

Gorlova O. E., Associate Professor, Candidate of Engineering Sciences, Associate Professor, gorlova_o_e@mail.ru

The article presents the results of research on increasing the mass fraction of iron in substandard metal-containing products obtained in the processing of blast-furnace and open-hearth furnace slags. When the current and mature slags of Ural Steel JSC are processed using the standard technology, the resulting metal concentrates of various fractions contain only 45–50 % of iron. Respective mineralogical studies of these concentrates and of the grain-size distribution of their metal inclusions were used as the basis for the development of deep processing circuits designed for the metal-containing material of the fractions of 8–50 and 0–8 mm, recovered from openhearth slags, and fractions of 0–5 mm of blast-furnace slags. These processing circuits envisage recrushing of all fractions in free-impact crushers for the selective liberation of slagged metallic inclusions, air classification of the slag crushed to separate the fine classes with low iron content, and dry magnetic separation of the coarse classification product. As a result of deep processing, the mass fraction of iron in the metal concentrates was significantly increased: by 28–34 % in the fine fractions of 0–5 and 0–8 mm, and by 24.5 and 16 % respectively in the fractions of 10–50 and 0–10 mm obtained by processing the metal concentrate of 8–50 mm. Circuit diagrams were designed for the machines to process the metal-containing products of various fractions and specific energy consumption was established per ton of high-grade products for use in agglomeration and blast-furnace processes.
The work was supported by the Ministry of Science and Higher Education of the Russian Federation within the framework of state assignment 5.8708.2017/8.9.

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