Pilot-scale magnetic separation as a method of inter-circuit concentration of dense medium separation products at Nyurba diamond placers

The pilot-scale testing of the two-stage wet magnetic separation with a view to reducing concentrate of dense medium separation of diamond-bearing materials from the Nakyn placer field, with a size of –6+1 mm has allowed: optimizing operation mode of magnetic separator CTS-910 at the first stage of magnetic separation flowsheet, which includes magnetic declination by 7 deg and ensures the maximum yield of a strong magnetic fraction (magnetite) from the initial material at the magnetic field strength of 2000 Oe; optimizing operation mode of strong magnetic separator EVM-28/9 at the second stage of magnetic separation flowsheet, which includes a shaft speed of 50 rpm and a slide gate angle of 40 deg, and ensures the maximum yield of a weak magnetic fraction (siderite) from the initial material at the magnetic field strength of 15 000 Oe; determining the technical efficiency of the two-stage magnetic separation flowsheet adopted as the method of inter-circuit concentration, which is governed by the maximal reduction of the dense medium separation concentrate owing to almost complete removal of weak magnetic siderite at the preserved diamond recovery of 99.2% to nonmagnetic fraction.

Nikitina Yu. N., Dvoichenkova G. P., Timofeev A. S., Podkamenny Yu. A. Pilotscale magnetic separation as a method of inter-circuit concentration of dense medium separation products at Nyurba diamond placers. MIAB. Mining Inf. Anal. Bull. 2025;(10):5-20. [In Russ]. DOI: 10.25018/0236_1493_2025_10_0_5.

Yu.N. Nikitina¹, Leading Engineer, Research and Design Institute of the Diamond Mining Industry «Yakutniproalmaz», 678175, Mirny, Russia, e-mail: nikitinayn@alrosa.ru,
G.P. Dvoichenkova^1,2, Dr. Sci. (Eng.), Assistant Professor, Chief Researcher; Professor, e-mail: dvoigp@mail.ru, ORCID ID: 0000-0002-0940-3880,
A.S. Timofeev¹, Cand. Sci. (Eng.), Senior Researcher, e-mail: Timofeev_ac@mail.ru, ORCID ID: 0000-0002-3382-6007,
Yu.A. Podkamenny^1,2, Cand. Sci. (Eng.), Researcher; Head of Chair, e-mail: mirniy.yuriy@mail.ru, ORCID ID: 0000-0002-4104-9113,
¹ Institute of Comprehensive Exploitation of Mineral Resources of Russian Academy of Sciences, 111020, Moscow, Russia,
² Polytechnic Institute (branch) of the North-Eastern Federal University named after M.K. Ammosov, 678174, Mirny, Russia.

Yu.N. Nikitina, e-mail: nikitinayn@alrosa.ru.

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