Аннотация
The authors investigate processibility of old manganese ore tailings of the Zhezdy Concentration Plant (Mn 10.6%, Fe 2.7%, SiO 2 60%) by dry and 2 high-intensity magnetic separation.The chemical and material analyses of the representative sample show that manganese occurs mainly in weakly magnetic minerals (braunite, psilomelane), which predetermines the expediency of application of high magnetic fields.Laboratory tests on roller separator 138T were carried out at the inductions of 0.33-0.90T. In the optimum mode of 0.48 T, the resultant magnetic concentrate features the Mn content of 29.7% at the recovery of 69.4% and yield of 24.7%, which is 2.6-2.8 times higher than the manganese content of the initial material.An increase of the induction up to 0.68-0.90T provides the maximum yield and recovery, but is accompanied by a decrease in the quality of the concentrate due to an increase in the content of SiO 2 , so such modes are only recommended for the rough processing stage with the subsequent after-treatment.The tendency of Mn concentration is confirmed by the data of the chemical analysis and energy dispersive X-ray spectroscopy (SEM ZEM-20 + EDS Oxford).The results clearly show the promising nature of dry magnetic separation of manganese ore tailings.