中文摘要：

以攀枝花密地选矿厂使用Ф1 050 mm×3 000 mm弱磁选机的粗选作业为例,运用传统的磁分离理论（磁性矿粒能被回收的前提是其所受磁力大于其所受重力与水阻力之和）对不同粒级磁性矿粒的回收率进行预测,预测结果与实测结果的相对误差最高达58.05%,因此对传统磁分离理论的普适性提出了质疑。进一步引入磁偶极子模型进行研究,结果表明：磁性矿粒在磁场中受到的磁偶极子力远大于其受到的重力、水阻力及磁力;由于磁偶极子力的作用,磁性矿粒在进入磁场后的0.02 s内即团聚成磁链,进而对弱磁选过程产生重要影响,传统磁分离理论正是由于没有考虑磁偶极子力的这种影响,才导致其被用于弱磁选效果预测时会产生较大的误差。这一研究成果为弱磁选设备的研制提供了新的参考依据。

英文摘要：

Taking the Ф1 050 mm × 3 000 mm wet drum low intensity magnetic separator in roughing operations in Panzhihua Midi concentrator for example,the recovery of magnetic minerals with different particles was predicted by using the traditional theory of magnetic separation（ the precondition of magnetic mineral particles be recycled is that the magnetic force is greater than the sum of gravity and water resistance which acting on particles）. And the relative error between the predicted result and the real data reaches maximum 58. 05%. Thus,it queries about the applicability of the traditional magnetic separation theory. Further study on magnetic dipole model is made. Results show that force between magnetic dipoles applied on magnetic particles in the magnetic field is much greater than the gravity,water resistance and magnetic force. Additionally,magnetic particles in magnetic field reunite into magnetic coagulation within 0. 02 s which has an important impact on process of low intensity magnetic separation due to the force between magnetic dipoles. Without considering the effect of magnetic dipole force,the traditional magnetic separation theory produces large error when predicting the effect of the low intensity magnetic separation. The research results provide new reference for designing magnetic separation equipment.