论文部分内容阅读
(一)存在问题与改进要点 开阳磷矿主要工业矿床呈倾斜中厚矿体产出,矿石品位高,储量大,开采技术条件较复杂,原设计采用的无底柱分段崩落法不能适应,逐渐演变为现行的无底柱分段空场法,生产中主要存在以下问题: 1.出矿作业安全性差。由于现行采矿方法沿用崩落法的结构,改用空场法的回采工艺,出矿作业必须进入采空场,而预留的顶柱又控制不好,加上直接顶不够稳固,装矿操作人员的安全没有保障。 2.矿石损失严重。历年矿石损失率高达45～48％,其原因有:底板残留矿石,分段顶底柱和天井矿柱不能回收;废石压矿;顶板不稳固,人不能进入空场出矿;采场爆破参数选择不当或施工不合要求,因爆破效果不好造成残留矿柱损失等。
(I) Existing Problems and Points for Improvement The main industrial ore deposits in Kaiyang Phosphorus Mine are inclined to medium-thick ore bodies with high ore grade, large reserves and complicated mining technical conditions. The subsea sub-caving method adopted in the original design can not be adapted , Gradually evolved into the current non-pillar column empty field method, the main problems in the production of the following: 1. Out of ore operation safety is poor. Due to the existing mining method used in the structure of caving method, the conversion method to the empty field of the mining process, mining operations must go to the mined-out field, and set aside the top column and poor control, coupled with the direct top is not stable enough, loading operators The security is not guaranteed. 2. Ore loss is serious. Over the years the ore loss rate as high as 45 ~ 48%, the reasons are: floor residual ore, top and bottom pillars and pillars mine column can not be recovered; waste rock pressure; roof unstable, people can not enter the open field ore; stope blasting Improper choice of parameters or construction requirements, as a result of poor blasting residual pillars loss and so on.