某铜矿球磨机钢球配比离散元仿真模拟分析研究

Discrete Element Simulation and Analysis of Steel Ball Proportion in Ball Mill of a Copper Ore

为解决某铜矿球磨机钢球尺寸配比不合理及磨矿效率低等问题,在不改变碎磨设备及工艺的条件下,对某铜矿Φ7.9 m×13.6 m球磨机进行钢球配比试验研究。结果表明,通过理论计算了球磨机初装配比为Φ80 mm:Φ60 mm:Φ50 mm:Φ40 mm:Φ30 mm=15:20:25:20:20,补加配比为Φ80 mm:Φ60 mm:Φ50 mm:Φ40 mm=25:35:20:20;推荐初装磨机内颗粒运动状态更为合理;推荐初装配比中能量≥0.01 J的共2484450组,比现场初装配比提高95286组,推荐补加配比中能量≥0.01 J的共2991435组,较现场初装配比提高122468组;推荐初装配比碰撞总能量比现场初装配比碰撞能量提高了29810 J,钢球与矿石的碰撞能量较现场初装配比提高了2.64个百分点,钢球与钢球的碰撞能量占比降低了2.15个百分点;推荐补加配比碰撞总能量比现场补加配比碰撞能量提高了698673 J,钢球与矿石的碰撞能量较现场补加配比提高了6.60个百分点,钢球与钢球的碰撞能量降低了7.57个百分点。通过离散元数值模拟验证了初装及补加制度的合理性,为现场工业应用提供依据。

In order to solve the problems of unreasonable steel ball size ratio and low grinding efficiency of a copper mine ball mill,without changing the crushing and grinding equipment and process,the steel ball ratio test of a copper mineΦ7.9 m×13.6 m ball mill was carried out.The results showed that,through the theoretical calculation,the initial assembly ratio of the ball mill wasΦ80 mm:Φ60 mm:Φ50 mm:Φ40 mm:Φ30 mm=15:20:25:20:20,and the supplementary ratio wasΦ80 mm:Φ60 mm:Φ50 mm:Φ40 mm=25:35:20:20.It was recommended that the movement of particles in the primary mill was more reasonable,the common 2484450 group with energy≥0.01 J in the primary ratio is recommended,which was higher than the 95286 group in the field primary ratio,and the common 2991435 group with energy≥0.01 J in the supplementary ratio was recommended,which was higher than the 122468 group in the field primary ratio.The total collision energy of the recommended initial assembly ratio was higher than that of the field initial assembly ratio by 29810 J,the collision energy of steel ball and ore is increased by 2.64 percentage points,and the collision energy proportion of steel ball and steel ball was reduced by 2.15 percentage points.The total collision energy of the recommended supplement ratio was higher than that of the on-site supplement ratio by 698673 J,the collision energy between steel balls and ore was increased by 6.60 percentage points,and the collision energy between steel balls was reduced by 7.57 percentage points.The rationality of the initial installation and supplement system was verified by the discrete element numerical simulation,which provided the basis for the industrial application.