回填废石层下放矿损贫预测及颗粒流数值分析

露天转地下开采，回填废石层在放矿过程中对矿石的损失和贫化有一定的影响。回填废石层下放矿损贫的主要影响因素有回填层厚度、废石的粒径和非均匀度3个方面，对不同试验者的实验数据重新处理，总结出了回填废石层下放矿贫化率和损失率的数学模型，并结合司家营铁矿Ⅲ采场的露天转地下工程进行了回填废石粒径与非均匀度的设计。通过颗粒流数值正交试验方法，分别从绝对因素和相对因素回归建立了贫化率λ、回填层厚度h、回填层粒径d、回填层粒径非均匀度K4个因素和损失率之间的关系，为类似条件下的回填层合理设计提供参考。

Ore Dilution Prediction of Ore Drawing below Backfilling of Waste Rock Layer and Particle Flow Numerical Analysis

When open-air is transferred to underground mining，the backfilling of waste rock layer has a certain impact on ore loss and dilution in the ore drawing process. There are three main factors of ore loss and dilution below backfilling of waste rock layer，backfilling thickness，and particle size of waste rock layer and its non-uniformal level. Through reprocessing the experimental data from different tests，the paper summed up the mathematical model of ore loss and dilution rate below the backfilling of waste rock layer. Combining with transition from open-pit to underground mining in stope Ⅲ of Sijiaying iron mine，the non-uniformity and particle size of the backfilling of waste rock layer are designed. Through the orthogonal experimental method of particle flow numerical simulation，the relationship of such four factors as ore dilution ratio λ，backfilling thickness h, particle diameter d, particle non-uniformity K of waste rock layer with the ore loss rate is set up，which provides a reference for the rational design of backfilling layer in similar conditions.