Reengineering of the ball mill drive at the Novotroitsk Plant of Chromium Compounds

The Novotroitsk Plant of Chromium Compounds specializes in the processing of chromite and dolomite ores, which are delivered to the first workshop of the grinding department, where they are crushed and ground in a ball mill. Operational experience has shown that the failure of the ball mill installed in this workshop leads to unplanned downtime due to failure of drive components, which accounts for 11.3% of the nominal operating time of the workshop. In order to increase the reliability of the technological equipment, it is proposed to replace the existing electric drive, which includes an obsolete 4A series electric motor and a special reducer, with a modern R167DV280V4/BVG122 motor-reducer, which transmits the rotation to the mill drum through a gear coupling. The development of the new drive has simplified its design and reduced the labor intensity of maintenance and repair. This technical solution increases the operating time between repairs, thus reducing operating costs. Calculations show that the implementation of the project solutions will lead to a 0.02% reduction in the cost of processing 1 ton of ore, a 1.37% increase in production profitability, and a 1.29% increase in sales profit. The additional investment does not exceed 3.4 million rubles and will be recovered in less than 3 months.