Optimization of mineral processing and grinding technology in zhongguan iron mine

After the commissioning of Zhongguan Iron Mine, the grinding process is prone to fluctuations, with frequent swelling of the autogenous mill, high cyclic load of the ball mill, and large amount of stubborn stones, posing a threat to the on-site production environment and labor intensity of employees. By changing a section of self grinding to semi-self grinding and adding steel balls with a filling rate of 8% and a diameter of 100 mm to the self grinding machine, the sensitivity of the mill to changes in the properties of the raw ore was passivated, and the processing capacity of the mill increased from 157 t/h to 160 t/h, and the power consumption decreased from 15.7 kW/t of raw ore to 15.4 kW/t of raw ore. By adding a pre grinding pre selection device, approximately 9 t/h of 3～25 mm waste rock can be removed in advance, which not only reduces solid waste emissions but also achieves a non mining efficiency of 3 300 yuan/d. By converting a section of open circuit grinding into a closed circuit grinding, and adding a roller crusher and a two-stage ball milling precision ball filling process, the particle size of stubborn stones entering the grinding process is reduced, and the grinding load is moved forward, fully utilizing the surplus grinding capacity of the semi autogenous mill and greatly improving the grinding effect of the ball mill. After optimizing the process technology, the fineness of the ore discharged by the ball mill increased by 4%. The steel ball consumption of the two-stage ball mill decreased from 0.14 kg/t raw ore to 0.12 kg/t raw ore, and the cyclic load decreased from 600% to 700% to 450%.