Study on Particle Size Characteristics of Crushing Products of Ekou Iron Ore by High Pressure Roller Mill
In order to improve the efficiency of grinding operation and reduce the production cost of concentrator in Ekou Iron Mine,the conditional experimental study on three influencing factors of roller surface pressure,roller surface speed and moisture content of high pressure roller mill is carried out for the fine crushing products of Ekou Iron Mine.The R-R particle size characteristic equation is used to sys-tematically analyze the particle size characteristics of the crushed products of the high pressure roller mill.The results of particle size characteristics show that with the increase of roller surface pressure,roller sur-face velocity and water content,the uniformity coefficient n of the rolling products under different condi-tions of the three influencing factors increases first and then decreases.According to the uniformity coeffi-cient,when the roller surface pressure is 5.5 MPa,the roller surface speed is 0.524 m/s,and the moisture content is 1％,the roller pressing effect is the best,the uniformity coefficient of the roller pressing product is the largest,and the particle size distribution is more concentrated.The closed-circuit rolling test is car-ried out under the optimal conditions of three influencing factors.The results show that the content of -1 mm in the rolling product reaches 69.99％,at this time,the unit throughput is 25.10 t/h,and the specific power consumption is 1.88(kW·h)/t.After increasing the high-pressure roller mill,the ore became easier to grind and the energy consumption of subsequent grinding is reduced.
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