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ORE PREPARATION
ArticleName Titanomagnetite ore two-stage grinding circuit tests
DOI 10.17580/or.2018.02.03
ArticleAuthor Pelevin A. E., Sytykh N. A.
ArticleAuthorData

Ural State Mining University (Ekaterinburg, Russia):

Pelevin A. E., Professor, Doctor of Engineering Sciences, Associate Professor, a-pelevin@yandex.ru

 

EVRAZ KGOK (Kachkanar, Sverdlovsk region, Russia):
Sytykh N. A., Head of Production Control Department

Abstract

This study covers the grinding and concentration technology for magnetite and titanomagnetite ores. With regard to these ores, it is suggested to evaluate the efficiency of respective grinding stages not only by the performance indicators of mills and sizing equipment, but also by the indicators of respective magnetic separation stages, in view of the inextricable link between grinding and concentration stages in magnetite ore concentration circuits. It is shown that magnetite iron recovery into the magnetic product of advanced drum separators exceeds 97 %. The yield of the nonmagnetic product relative to the grinding or crushing stage characterizes the degree of minerals opening by the mill or crushers. Therefore, the grinding efficiency for the magnetite or titanomagnetite ore (middlings of wet magnetic separation) may be additionally evaluated by the specific yield of the mill in terms of opened rock minerals. The maximum opening of titanomagnetite ore minerals is achieved during the first and second grinding stages. During the third grinding stage, the opening of rock minerals is significantly lower. This suggests a possibility of converting from three-stage to two-stage grinding. The study includes the results of industrial tests of two-stage grinding circuits for the titanomagnetite ore with an estimate of respective performance indicators of the mill, hydrocyclones, screens and magnetic separators. For Kachkanarsky GOK, a circuit with verification classification and control screening in the second stage is found to be the most promising of the available two-stage circuits. Implementation of this circuit would require additional installation of a screen and an increased-capacity pump and an increase in the number of hydrocyclones and magnetic separators. The circuit tested enables a reduction of titanomagnetite ore grinding costs.

keywords Titanomagnetite ore, opening of rock minerals, grinding stage, middlings, specific mill performance, fine screening
References

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