缓倾斜厚石膏矿低贫化放矿实验研究

为解决石膏矿贫损问题，采用物理模拟实验方法，研究优化了采场放矿底部结构.主要研究了端部放矿时石膏矿石散体流动迹线和覆岩下放矿时矿石厚度、堑沟间距及出矿横穿间距对矿石回收率的影响.分析和实验结果表明:矿石散体厚度超过20m时，宜采用平底堑沟诱导冒落，矿石回收率随堑沟间距变大而增加，且在堑沟间距取18m时最大;散体厚度小于20m时，宜采用串联堑沟诱导冒落法，回收率随堑沟间距增大而减小，为提高回收率，堑沟间距取10m，出矿横穿间距取8m.

Experimental Study of Low Dilution Drawing in Gently Inclined Thick Gypsum Deposit

The physical experiment on optimization of the stope structure parameters in induced caving method was performed to reduce ore losing and degrading. The mineral particles and the effects of thickness of mineral grain， spacing of trenches and spacing of alleyways on the recovery rate were investigated. The results showed that when the thickness of mineral grain is more than 20m， induced caving method with double trench is applied， and the distance between trenches should be 18m. Induced caving method with tandem trenches is suitable for conditions when the thickness of mineral grain is less than 20m， and the distance between trenches should be 10m， and the distance between alleyways should be 8m.