Institute of the Earth’s Crust, SB RAS (Irkutsk, Russia):

Prokopyev S. A., Head of Department, sapr100@mail.ru

Ural State Mining University (Ekaterinburg, Russia):
Pelevin A. E., Professor, Doctor of Engineering Sciences, Associate Professor, a-pelevin@yandex.ru

Stoilensky Mining and Proccessing Plant (Stary Oskol, Belgorod region, Russia):
Napolskikh S. A., CEO

Vysokogorsky Mining and Proccessing Plant (Nizhniy Tagil, Sverdlovsk region, Russia):
Gelbing R. A., Chief of Technical Management — Deputy Chief Engineer

The article covers staged iron concentrate recovery with the use of the screw separation technology. In the environments of currently operating enterprises, staged concentrate recovery is mainly possible for products containing sufficient amounts of non-liberated magnetite grains. It is most expedient to apply the staged concentrate recovery approaches for magnetic products of wet magnetic separation. The use of gravity methods is due to significant differences in densities between magnetite and host rocks. The article presents the results of industrial application of the screw separation technology for the staged separation of iron concentrate at two enterprises processing skarn magnetite ores. It is shown that screw separation enables obtaining a part of the final concentrate with the mass fraction of iron of 63.1 % to 63.3 %. The proportion of the screw separation concentrate contained in the main magnetic separation concentrate is 20–30 %. The results of pilot-scale tests of the technology of staged separation of magnetite concentrate at the production site of the Stoilensky GOK concentrating plant used for the processing of magnetite quartzites are also presented in the article. It is shown that, after the first ball milling stage, in three-stage grinding, screw separation enables obtaining a part of the final concentrate with the mass fraction of iron of 67.60 % with the recovery of 23.12 % of the wet magnetic separation middlings of the first stage. Separation of a part of the final concentrate allows reducing the costs of subsequent grinding operations.

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