| This dissertation is the actual item of Dagushan concentration plant. The aim of this item is to optimizing the mill mineral process currently used, and reduce the quantity of tiny fine fraction in the mine course, and make sure the products of the mill-mineral are more advantageous on the mineral concentration, at the same time, raise energy utilization to implementation energy-saving and wastage-reducing.In late years, productionvolume and import volume of ore increased rapidly, and at the same time, grinding technics have the feature of high-involvement, high-abration, high energy consumption, low ineffectiveness. So, the optimize research of grinding technics is very necessary to t save energy, lower energy consumption and reduce pollutants discharge.The dissertation mainly studied the influence of factors about ball diameter, grinding revolving speed, grinding time, feeding size etc to grinding effect. Individual take different conditions to testing cross in detail, and use advanced Laser Particle Sizer to analyzing the grinding product. At the same time, do the Bond work index test, striking-crashing characteristic test, compression strength test to by way of the assistant means to analysis the test data of grinding.The innovations of the issue were mainly revealed in quantitative calculation the energy,momentum and the kinestate of balls, and integrate the grinding test of ore to discus the relation between grinding and energy,momentum from the standpoint of the transform of energy and momentum.The result indicate that the rotation rate of mill is on the low side in Dagushan Beneficiation Plant. Result of cmpression strength test and Bond work index test indicate the ore is medium hard; result of striking-crashing characteristic test indicate if increase the rotation rate from 77.6% to 85%-90% the grinding result is better, and the result of grinding test indicate increase is propitious to grinding. The actual whirling speed is higher than the tradition theory whirling speed.
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