Krivoy Rog National University (Ukraine):

Mulyavko V. I., Professor, Doctor of Engineering Sciences, muwali2012@yandex.ru
Oleynik Т. А., Head of Chair, Professor, Doctor of Engineering Sciences, taoliynik@gmail.com
Oleynik М. О., Postgraduate, lpumrmax@gmail.com
Mikhno S. V., Postgraduate

Ukrainian Scientific R&D Institute for Industrial Technology (Ukraine):

Lyashenko V. I., Head of Department, Ph. D. in Engineering Sciences, Senior Researcher, vi_yashenko@mail.ru

Two types of separators: triboelectric and magnetic, have been proposed and tested with respect to feebly magnetic ores separation, providing for high operating efficiency owing to continuous separation process and design simplification. Possibility of production of concentrates with iron fraction of total mass reaching 60.6 %, recovery being 76.9 %, was verified. In beneficiation of oxidized quartzites, iron fraction of total mass in tailings amounts to 14.1 %. A new magnetic separator operating parameters, that provide for its higher efficiency and more reliable functioning, are substantiated with regard to offset between rotational axes of drum and ferromagnetic cylinder, i. e., eccentricity, which allows to eliminate complex and unreliable systems for drum working surface regeneration and its fixation in operating position, thus making separation process continuous. In addition to that, rotation of magnetic system and drum working surface at similar linear speeds permits to recover even weakly-magnetic particles and intergrowths, composed of magnetic and non-magnetic material, from free-flowing material on the separator. The same is facilitated by heteropolar installation of magnetic elements with a clearance between their peripheral edges, thus increasing magnetic-field intensity gradient, i. e., force affecting particles in material flow. A triboelectric separator has been designed and tested; this type of separator provides for higher-intensity charging of particles and selective separation of positively charged particles. It was established, that an apparatus for effective separation of oxidized iron ore minerals needs to be equipped with several systems for charging and separation. Passing through them, separated material flow is totally cleaned from positively charged particles. Particles limit concentration per unit volume has been calculated - when it is exceeded, the apparatus efficiency of operation decreases.

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